This article describes how to write, compile and execute a "Hello World" program in java on Linux (Fedora).

1. the prerequisites

• a text editor of your choice (e.g. vi)
• a java compiler (go to http://fedoraproject.org/wiki/JavaFAQ for more details about Java on Fedora)

2. write the code

open an empty file with a text editor (e.g. vi):

# vi HelloWorld.java

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

important: the source file must have the same name as the public class (HelloWorld.java)

explanation

public class HelloWorld {
}

our "main" class is called HelloWorld. public indicates that the class can be used by any program or user.

public static void main( String args[] ) {
} 

The main method ist where the execution of the class starts. void indicates that the method does not return any value.

System.out.println( "Hello World!" );

This prints out the string "Hello World!"

3. compile into bytecode

# javac HelloWorld.java

4. run the program

# java HelloWorld
Hello World!

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