Hello World in Java

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Hello World Program in Java

This is your first java program, simply write on any editor and save your code with finename.java and after saving program compile using javac tool and run by using java tool.

Hello World Program in Java

class Hello 
{
  public static void main(String[] args) 
   {
    System.out.println("Hello World!");
   }
}

Output

Hello World!

Syntax to compile and run java program

Syntax

for compile -> c:/javac Hello.java
for run -> c:/java Hello

Explanation of Code

  • System.out.println("....."): are used for display message on screen or console.

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Path variable is set for providing path for all Java tools like java, javac, javap, javah, jar, appletviewer which are used in java programming. All these tools are available in bin folders so we set path upto bin folders.

Classpath variable is set for providing a path for predefined Java classes which is used in our application. All classes are available in lib/rt.jar so we set classpath upto lib/rt.jar.

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