HOMLHA.gif (1058 bytes) - PC - Software - Programmering - Java - Java applications

Every application:
- must implement the method: main(Strings[] args)
Java applications - Hello World - from The Java Tutorial 2.ed. p. 9 gox.gif (837 bytes)Hello World Applet
Notepad - Program Source:
/*
 The HelloWorldApp class implements an application that
 simply displays "Hello World!" to the standard output.
*/
class HelloWorldApp
{
  public static void main(String[] args)
	//public : allows any class to call this method
	//static : a class method
	//void   : returns no value
	//String[] args : an array of strings 
	//                = command-line arguments, 
        //                  the first is args[0]
	//         NB: numberOfArgs = args.length
  { // use the System class
    System.out.println("Hello World!"); // Display the string
  }
}
 
Save As: HelloWorldApp.java
         !case is significant!
MS-DOS Prompt:
set PATH to include \java\bin (C:\jdk\java\bin)
    >path c:\jdk\java\bin;%path% 
Compile:
    >javac HelloWorldApp.java 
   The compiler creates HelloWorldApp.class
Run application:
    >java HelloWorldApp 
Output:
    Hello World!