TechFusion: Java

Java Program without main() function?

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<span style="font-family: Georgia, Times New Roman, serif;">Hi,</span></div>
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<span style="font-family: Georgia, Times New Roman, serif;"><br /></span></div>
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<span style="font-family: Verdana, sans-serif;">This
Article Based on Java Program, without main () function<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">"Java is class based object oriented programming Language"...<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">Example:<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">class Math<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">{<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">Static   //main() is
not use this program<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">{<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">int a, b, c;<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">a=12;<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">b=5;<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">c=a+b;<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">if(c==a+b)<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">{<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">System.out.println("a+b\t" +c );<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">c=a-b;<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">if(c==a-b)<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">{<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">System.out.println("a-b\t" +c);<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">c=a*b;<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">if(c==a*b)<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">{<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">System.out.println("a*b\t" +c);<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">c=a/b;<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">if(c==a/b)<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">{<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">System.out.println("a/b\t" +c);<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">}<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">else<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">{<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">System.out.println("No result");<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">}<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">}<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">}<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">}<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">}<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">}<o:p></o:p></span></div>
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<br /></div>
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<span style="font-family: Verdana, sans-serif;">Create this program in notepad and open CMD and got to
location where your program have save as like suppose desktop then type cd
desktop then you see CMD </span><o:p></o:p></div>
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<o:p></o:p></div>
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<span style="font-family: Verdana, sans-serif;">Then my program file save in new folder as like java prog so
then I command use cd java prog then seen CMD</span><o:p></o:p></div>
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<o:p></o:p></div>
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<span style="font-family: Verdana, sans-serif;">Then seen output use command for compile java program<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">Javac math.java<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">    When compile
program then automatically generate class file go to java prog folder or own
location where you save math.java program.<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">It is compile successfully no any error…<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">After that run the java program use command java and class
name …as like this…<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">Java math<o:p></o:p></span></div>
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<span style="font-family: Verdana, sans-serif;">Seen CMD for output..</span><o:p></o:p></div>
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<o:p></o:p></div>
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<span style="font-family: Verdana, sans-serif;">Finally no any error compiles and run time … only exception
at after rum and output but before not any exception…</span><o:p></o:p></div>
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<o:p> By KR...</o:p></div>
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Java Program without main() function?

Hi, This Article Based on Java Program, without main () function "Java is class based object oriented programming Language...

Why String is immutable in Java ?

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<b><span style="font-family: "Times New Roman","serif"; font-size: 24.0pt; mso-fareast-font-family: "Times New Roman"; mso-font-kerning: 18.0pt;"><span style="color: blue;">Why  String  is immutable in Java ? </span><o:p></o:p></span></b></div>
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<li><span style="font-family: Symbol; font-size: 12pt; text-indent: -0.25in;"><span style="font-family: 'Times New Roman'; font-size: 7pt;"> </span></span><span style="font-family: 'Courier New'; font-size: 10pt; text-indent: -0.25in;">String</span><span style="font-family: 'Times New Roman', serif; font-size: 12pt; text-indent: -0.25in;">   is an immutable
class in Java.</span></li>
<li><span style="font-family: Symbol; font-size: 12pt; text-indent: -0.25in;"><span style="font-family: 'Times New Roman'; font-size: 7pt;">   </span></span><span style="font-family: 'Times New Roman', serif; font-size: 12pt; text-indent: -0.25in;">An immutable class is simply a class
whose  instances(objects) cannot be
modified. All information in an instance is initialized when the instance is
created and the information can not be modified.</span></li>
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<b><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"><span style="color: red;"><u>1. Requirement of String Pool</u></span></span></b><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"><o:p></o:p></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">String pool  is a special storage area in <a href="http://www.programcreek.com/2013/04/jvm-run-time-data-areas/" title="JVM Run-Time Data Areas"><span style="color: blue;">Method Area</span></a>().
When a string is created and if the string already exists in the pool, the
reference of the existing string will be returned, instead of creating a new
object and returning its reference. <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">The following code will create only
one string object in the heap.<o:p></o:p></span></div>
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<span style="color: #003399; font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">String</span><span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";"> string1
  <span style="color: #339933;">=</span> <span style="color: blue;">"abcd"</span><span style="color: #339933;">;</span><o:p></o:p></span></div>
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<span style="color: #003399; font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">String</span><span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";"> string2
  <span style="color: #339933;">=</span> <span style="color: blue;">"abcd"</span><span style="color: #339933;">;</span><o:p></o:p></span></div>
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<span style="font-family: Times New Roman, serif;"><b>Memory representation of string1 and string2:</b></span><br />
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<ul style="text-align: left;">
<li><span style="font-family: 'Times New Roman', serif; font-size: 12pt;">If string is not immutable, changing
the string with one reference will lead to the wrong value for the other
references.</span></li>
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<span style="font-family: 'Times New Roman', serif; font-size: 12pt;"><span style="color: red;"><b><u>2. Caching Hashcode</u></b></span></span><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"><o:p></o:p></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">The hashcode of string is frequently
used in Java. For example, in a HashMap. Being immutable guarantees that
hashcode will always the same, so that it can be cashed without worrying the
changes.That means, there is no need to calculate hashcode every time it is
used. This is more efficient.<o:p></o:p></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">In String class, it has the
following code:<o:p></o:p></span></div>
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<b><span style="font-family: 'Courier New'; font-size: 10pt;">private</span></b><span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";"> <b><span style="color: #000066;">int</span></b> hash<span style="color: #339933;">;</span><i><span style="color: #666666;">//this is used to cache hash code.</span></i><o:p></o:p></span></div>
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<b><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"><span style="color: red;"><u>3. Security</u></span></span></b><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"><o:p></o:p></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">String is widely used as parameter
for many java classes, e.g. network connection, opening files, etc. Were String
not immutable, a connection or file would be changed and lead to serious
security threat. The method thought it was connecting to one machine, but was
not. Mutable strings could cause security problem in Reflection too, as the
parameters are strings. <o:p></o:p></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">Here is a code example:<o:p></o:p></span></div>
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<b><span style="color: #000066; font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">boolean</span></b><span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">
  connect<span style="color: #009900;">(</span>string s<span style="color: #009900;">){</span><o:p></o:p></span></div>
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<span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">    <b>if</b> <span style="color: #009900;">(</span><span style="color: #339933;">!</span>isSecure<span style="color: #009900;">(</span>s<span style="color: #009900;">))</span> <span style="color: #009900;">{</span> <o:p></o:p></span></div>
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<b><span style="font-family: 'Courier New'; font-size: 10pt;">throw</span></b><span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";"> <b>new</b> <span style="color: #003399;">SecurityException</span><span style="color: #009900;">()</span><span style="color: #339933;">;</span> <o:p></o:p></span></div>
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<span style="color: #009900; font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">}</span><span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";"><o:p></o:p></span></div>
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<span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">    <i><span style="color: #666666;">//here will cause problem, if s is changed before this
  by using other references.    </span></i><o:p></o:p></span></div>
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<span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">    causeProblem<span style="color: #009900;">(</span>s<span style="color: #009900;">)</span><span style="color: #339933;">;</span><o:p></o:p></span></div>
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<span style="color: #009900; font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";">}</span><span style="font-family: "Courier New"; font-size: 10.0pt; mso-fareast-font-family: "Times New Roman";"><o:p></o:p></span></div>
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<b><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"><span style="color: red;"><u>4. Immutable objects are naturally
thread-safe</u></span></span></b><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"><o:p></o:p></span></div>
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<span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">Because immutable objects can not be
changed, they can be shared among multiple threads freely. This eliminate the
requirements of doing synchronization. <o:p></o:p></span></div>
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<span style="font-family: Symbol; font-size: 12.0pt; mso-bidi-font-family: Symbol; mso-fareast-font-family: Symbol;">·<span style="font-family: 'Times New Roman'; font-size: 7pt;">        
</span></span><b><u><span style="color: red; font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";">Summary: </span></u></b><span style="font-family: "Courier New"; font-size: 10.0pt; mso-bidi-font-size: 11.0pt; mso-fareast-font-family: "Times New Roman";"> String</span><span style="font-family: "Times New Roman","serif"; font-size: 12.0pt; mso-fareast-font-family: "Times New Roman";"> is designed to be immutable for the sake of efficiency and
security. This is also the reason why immutable classes are preferred in
general. <o:p></o:p></span></div>
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Why String is immutable in Java ?

Why String is immutable in Java ? String is an immutable class in Java. An immutable class is simply a class whose inst...

8 Steps to run Java Program using command prompt

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<b><span style="color: blue;">8  Steps to run Java Program  using command prompt</span></b></h2>
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<b style="background-color: #93c47d;">Step 1: Write a Java code using notepad </b></div>
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<b>            For example:- </b></div>
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<b>                                   class HelloWorld</b></div>
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<b>                                           {  </b></div>
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<b>                                                 public static void main(String args[])</b></div>
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<b>                                                 {</b></div>
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<b>                                                       System.out.println("Hello  Java");</b></div>
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<b>                                                  }</b></div>
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<b>                                           }</b></div>
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<b><br /></b></div>
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<b style="background-color: #93c47d;">Step 2: Save it as HelloWorld.java  (For example : It is saved in  C:\Users\comp\Java Practiced program).</b></div>
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<b><br /></b></div>
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<b style="background-color: #93c47d;">Step 3: Set environment variable . </b></div>
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<b><br /></b></div>
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<b>Right Click  on <u> MyComputer </u>-> <u>Properties </u>-> <u>Advanced System settings </u>-> Inside<u> Advanced tab</u></b></div>
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<b> Click <u>Environment variables</u> -> Inside <u>System Vaiables </u>click  <u>New </u>  ->  Give <u>variable name</u> (For example <u> var</u>) -> Give variable value. It  is path in your system where java compiler is available  </b><b>(For example  variable value :C:\Program Files\Java\jdk1.6.0_23\bin ). Inside bin </b><u><b><i> javac</i></b></u><b>   is Java compiler</b><b>.</b></div>
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<b><br /></b></div>
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<b>Click<u> Ok</u>.</b></div>
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<br /></div>
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<b style="background-color: #93c47d;">Step 4: Go to command prompt by using start->Run->cmd  OR  start-> type <u>cmd</u> in search program and file.</b></div>
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<b>Press Enter.</b></div>
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<b><br /></b></div>
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<b style="background-color: #93c47d;">Step  5:Use the following command to  go the  folder where previous Java program is stored.</b></div>
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<b>           cd  </b><b>C:\Users\comp\Java Practiced program</b></div>
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<b><br /></b></div>
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<b>Press enter</b></div>
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<b><br /></b></div>
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<span style="background-color: #93c47d;"><b>Step 6 :  Set path of Compiler. </b><b> It  is path in your system where java compiler is available </b></span></div>
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<b>               For example,  set path=</b><b>C:\Program Files\Java\jdk1.6.0_23\bin;</b></div>
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<b><br /></b></div>
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<b> Press enter</b></div>
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<b><br /></b></div>
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<b style="background-color: #93c47d;">Step 7: Write following command for compilation of program</b></div>
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<b>           javac  HelloWorld.java</b></div>
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<b><br /></b></div>
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<b> Press Enter</b></div>
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<b><br /></b></div>
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<b style="background-color: #93c47d;">Step 8: To run program use following command</b></div>
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<b>              java  HelloWorld</b></div>
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<b>Now  output is shown :  Hello Java</b></div>
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<b><br /></b></div>
<div>
<b><span style="background-color: #e06666;">If any  query mail Please mail me on vaishalichaudhari1992@gmail.com  or comment it....</span></b></div>
</div>

8 Steps to run Java Program using command prompt

8 Steps to run Java Program using command prompt Step 1: Write a Java code using notepad For example:- ...

Create your first Java program

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<span style="vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Create your first Java program </span></span></h2>
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<span style="color: #4f81bd; font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">1.1. Target of this exercise </span></span></h3>
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<span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">The following section describes how to create a minimal Java application using Eclipse. It is tradition in the programming world to create a small program which writes "Hello World" to the console. We will adapt this tradition and will write "Hello Eclipse!" to the console. </span></span></div>
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<span style="color: #4f81bd; font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">1.2. Create project </span></span></h3>
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<span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">This book uses the naming convention that the project is named the same as the top-level package in the project. </span></span></div>
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<span style="font-family: Verdana, sans-serif;"><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;">Select File → New → Java project from the menu. Enter   </span><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">MyProject </span><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"> as the project name. Select the Create separate folders for sources and class files flag. </span></span></div>
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img height="351px;" src="https://lh5.googleusercontent.com/PyPVaNUaPBgUOT1JDhyGqjPO5HFBchAR-6FUD4NjDW34OuEhsDCwfNp98qTc8F9IFTB4nZtCMrrcTaBGtDahcomctVWsrZjYp-ft87_czetlQXdeVsSmJ9DyNai49oVillilUZfnAYc" style="-webkit-transform: rotate(0rad); border: none;" width="624px;" /></span></span></div>
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Press the Finish button to create the project. A new project is created and displayed as a folder. Open the  MyProject    folder and explore the content of this folder.</span></span></div>
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<span style="color: #4f81bd; font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">1.3. Create package </span></span></h3>
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<span style="font-family: Verdana, sans-serif;"><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;">In the following step you create a new </span><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">package</span><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;">. A good convention for the project and package name is to use the same name for the top level package and the project. For example, if you name your project </span><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">com.example.javaproject </span><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"> you should also use </span><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">com.example.javaproject</span><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"> as the top-level package name. </span></span></div>
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<span style="font-family: Verdana, sans-serif;"><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;">To create the </span><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">firstpackage </span><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"> package, select the  </span><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">src</span><span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"> folder , right-click on it and select New → Package. </span></span></div>
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img height="351px;" src="https://lh4.googleusercontent.com/SG6P63LswarCY4dWx1ODlECXbYnmIOvi7s2wL0_Q9SvYjVVTvneqWBW1NA3_yreFPhbvthHMW9EobHz_hnsDUp-nQbsYjs-zmFcBIk0N67g7_7dyR9Y4i3hdyGs-tFtWs4-M87GssLc" style="-webkit-transform: rotate(0rad); border: none;" width="624px;" /></span></span></div>
<span style="font-family: Verdana, sans-serif;"><br /></span>
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<span style="color: #4f81bd; font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">1.4. Create Java class </span></span></h3>
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<span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Create a Java class. Right-click on your package and select New → Class. </span></span></div>
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img height="351px;" src="https://lh6.googleusercontent.com/o6vu4llnzIfrmXWGHz_MX4BHd-1qaX6qhPRzQqVEbACe9X3ONSH19taUIEt7B3jTlgrU9QKC48paeD3e4JwwPcERzqFdBTOfg7t7X18Y-p_I7VhhJRe1WMEs7d7p8UTpAIyL3bl7hI8" style="-webkit-transform: rotate(0rad); border: none;" width="624px;" /></span></span></div>
<span style="font-family: Verdana, sans-serif;"><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /></span><br />
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Enter   HelloWorld  as the class name and select the public static void main (String[] args) checkbox.</span></span></div>
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img height="351px;" src="https://lh3.googleusercontent.com/RE62ZjqQI0mgUlBaZctIQhcANQ544H98XfPLcwBzgTZ8CJ1Kwfbs877xDdcbnnYuT-UsOtEKcxUspHTKWEVG2Ufi6Y0gjf9fhdMvcw02heFMRFJMiI4JGiM4PO1zCqOK8P56J9eHux0" style="-webkit-transform: rotate(0rad); border: none;" width="624px;" /></span></span></div>
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Press the Finish button</span></span></div>
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<span style="font-family: Verdana, sans-serif;"><span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;">This creates a new file and opens the Java </span><span style="font-size: 15px; font-style: italic; vertical-align: baseline; white-space: pre-wrap;">editor</span><span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;">. Change the class based on the following listing.</span></span></div>
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<span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">package firstpackage</span></span></div>
<span style="font-family: Verdana, sans-serif;"><br /></span>
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<span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">public class MyFirstClass {</span></span></div>
<span style="font-family: Verdana, sans-serif;"><br /></span>
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<span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">  public static void main(String[] args) {</span></span></div>
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<span style="font-family: Verdana, sans-serif;"><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">    System.out.println(</span><span style="color: blue; font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">"Hello Eclipse!"</span><span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;">);</span></span></div>
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<span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">  }</span></span></div>
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<span style="font-size: 13px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">  </span></span></div>
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<span style="color: #4f81bd; font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"> Run your project in Eclipse </span></span></h3>
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<span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Now run your code. Either right-click on your Java class in the Package Explorer or right-click in the Java class and select Run-as → Java application. </span></span></div>
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<span style="font-size: 15px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img height="351px;" src="https://lh3.googleusercontent.com/96-xDAstR_cMtfB_1uTRfBw7kagPW0UzeP5m5PCMRVo5SVuIBk6QloTsmUsbfZiS_8WaWLEK2UthzV1MS8UYSXUvwt4OkI-5nLMJTPqup0n48qvI7j6u0FujQt0guMzoj5CnKbV7ny4" style="-webkit-transform: rotate(0rad); border: none;" width="624px;" /></span></span></div>
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<span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Eclipse will run your Java program. You should see the output in the Console view . </span></span></div>
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<span style="font-size: 16px; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img alt="Result of the running application" height="74px;" src="https://lh3.googleusercontent.com/UHWsmt3H07tdxzlW3xh9uWmkUawj-NXi__G04OgVCswsrtEO1cavCWPXcVEBwvxo3O_metAu8uSNG8UFYWR-xjhralPhPJay9GbsFqyi_AILKf71XIzU4L5v0g3F0plIwd8OlIExOBA" style="-webkit-transform: rotate(0rad); border: none;" width="315px;" /></span></span></div>
<span style="font-family: Verdana, sans-serif;"><br /></span></div>

Create your first Java program

Create your first Java program 1.1. Target of this exercise The following section describes how to create a minimal Java application u...

Introduction to eclipse IDE

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<ul style="margin-bottom: 0pt; margin-top: 0pt;">
<li dir="ltr" style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Eclipse as an integrated development environment (IDE) for Java  development.</span></span></div>
</li>
<li dir="ltr" style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Eclipse  IDE  is open source.</span></span></div>
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<li dir="ltr" style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Today it is the leading development environment for Java with a market share of approximately 65%.</span></span></div>
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<li dir="ltr" style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">The Eclipse Open Source community has over 200 Open Source projects covering different aspects of software development.</span></span></div>
</li>
</ul>
<b id="docs-internal-guid-0bbd8123-b8af-530a-9097-745dea0a8d3a" style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /></span></b>
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<span style="background-color: transparent; color: black; font-size: 24px; font-style: normal; font-variant: normal; font-weight: bold; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Java requirements of Eclipse</span></span></div>
<ul style="margin-bottom: 0pt; margin-top: 0pt;">
<li dir="ltr" style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 10pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Eclipse requires an installed Java runtime. Eclipse 4.4 requires at least Java 6 to run.</span></span></div>
</li>
<li dir="ltr" style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1; margin-bottom: 5pt; margin-top: 5pt;">
<span style="font-family: Verdana, sans-serif;"><span style="background-color: transparent; color: black; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Java can be downloaded in two flavors: a </span><span style="background-color: transparent; color: black; font-size: 16px; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">JRE</span><span style="background-color: transparent; color: black; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> (Java Runtime Environment) and a </span><span style="background-color: transparent; color: black; font-size: 16px; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">JDK</span><span style="background-color: transparent; color: black; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"> (Java Development Kit) version. </span></span></div>
</li>
<li dir="ltr" style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; list-style-type: disc; text-decoration: none; vertical-align: baseline;"><div dir="ltr" style="line-height: 1; margin-bottom: 5pt; margin-top: 5pt;">
<span style="background-color: transparent; color: black; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">The Eclipse IDE contains its own Java compiler hence a JRE is sufficient for most tasks with Eclipse. </span></span></div>
</li>
</ul>
<h2 dir="ltr" style="line-height: 1; margin-bottom: 5pt; margin-top: 5pt;">
<span style="background-color: transparent; color: black; font-size: 24px; font-style: normal; font-variant: normal; font-weight: bold; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Download Eclipse</span></span></h2>
<h2 dir="ltr" style="line-height: 1; margin-bottom: 5pt; margin-top: 5pt;">
<span style="font-family: Verdana, sans-serif;"><span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Download the </span><span style="background-color: transparent; color: black; font-size: 15px; font-style: italic; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Eclipse IDE for Java Developers </span><span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">package from the following URL. Ensure that you download the right version for your Java version (e.g., 32 bit vs. 64 bit).  </span></span></h2>
<div dir="ltr" style="line-height: 1; margin-bottom: 0pt; margin-top: 0pt;">
<span style="font-family: Verdana, sans-serif;"><a href="http://www.eclipse.org/downloads" target="_blank"><b><span style="color: blue; font-size: large;">Download here</span></b></a></span></div>
<b style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /></span></b>
<div dir="ltr" style="line-height: 1; margin-bottom: 14pt; margin-top: 14pt;">
<span style="background-color: transparent; color: black; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">The following screenshot shows the Eclipse download website for a Windows  system. Press on the link beside the package description (Windows 32-Bit) to start the download. </span></span></div>
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 10pt; margin-left: 36pt; margin-top: 0pt;">
<span style="font-family: Verdana, sans-serif;"><br /></span></div>
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 10pt; margin-left: 36pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img alt="C:\Users\comp\Desktop\1.png" height="350px;" src="https://lh4.googleusercontent.com/eh1A3K4ZKgy8VNlhVn9g3RNJ53BNTYYsAq6LQt0jUYUJ0URGNqGZ5F4ypm-_EZqBxDwPIf9gwGVQvyxXsdP_uKMSbQp19uEAN7GKCwo2bXgzO3AlvgMefQpKC5wlio8pkdbLRka4JBk" style="-webkit-transform: rotate(0rad); border: none;" width="624px;" /></span></span></div>
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 10pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-style: normal; font-variant: normal; font-weight: bold; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">After  download  unzip  it.</span></span></div>
<b style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /></span></b>
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 10pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-style: normal; font-variant: normal; font-weight: bold; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Start Eclipse  by clicking  eclipse.exe</span></span></div>
<b style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /></span></b><br />
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-left: 36pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img alt="C:\Users\comp\Desktop\2.png" height="350px;" src="https://lh5.googleusercontent.com/StGMjdMBHFudKmJcUABkfvaLlnINdYwmR58gGLXIi6BUIAcW4oA3KV80AGtLMGCjqxAxPsKbuFDOr4sryorX85VYSOQ3JrUoB0Plyle2i56hNr-KHJSw56zXYv3g-fMiu9ofoSHrMOA" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="624px;" /></span></span></div>
<b style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /></span></b><br />
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-left: 36pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-style: normal; font-variant: normal; font-weight: bold; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">Eclipse starts and shows the Welcome page. Close this page by clicking the x beside Welcome.</span></span></div>
<b style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /></span></b><br />
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-left: 36pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img alt="C:\Users\comp\Desktop\3.png" height="350px;" src="https://lh4.googleusercontent.com/ILFZDA9oUCX00GwOeJbw4lz6hyYF95ITMsL80mqWryA9hmA8YK8sOoRRHpdafCXp7D93lLP6IKacK4U22UQlv253NtY3dVOMHS-XU4tTV7RzAIm46csSVaHMeJIZ3pZkTVO28GdKG_A" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="624px;" /></span></span></div>
<b style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /></span></b><br />
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-left: 36pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 21px; font-style: normal; font-variant: normal; font-weight: bold; text-decoration: underline; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;">After closing the welcome screen, the application should look similar to the following screenshot.</span></span></div>
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-left: 36pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span class="Apple-tab-span" style="white-space: pre;"><span style="font-family: Verdana, sans-serif;">	</span></span></span></div>
<div dir="ltr" style="line-height: 1.1500000000000001; margin-bottom: 0pt; margin-left: 36pt; margin-top: 0pt;">
<span style="background-color: transparent; color: black; font-size: 15px; font-style: normal; font-variant: normal; font-weight: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;"><span style="font-family: Verdana, sans-serif;"><img height="351px;" src="https://lh6.googleusercontent.com/3fp2CGCzZmok2lk3QHKsXrW7nb0HXJ7TL0wyWBkDDJKZafeweW6A8vu_5S4-kgcw8N76GM7m8mP70cuqB1lOqyeBA-XTYwG8aODydZRQKXkxvLAaD3wZJLXs1HGUX57WWkcQzovrbvw" style="-webkit-transform: rotate(0.00rad); border: none; transform: rotate(0.00rad);" width="624px;" /></span></span></div>
<b style="font-weight: normal;"><span style="font-family: Verdana, sans-serif;"><br /><br /></span></b><br />
<h2 dir="ltr" style="line-height: 1; margin-bottom: 5pt; margin-top: 5pt;">
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