CP2003 - Principles of Programming Languages Page 1 of 35 The Syntax of Java

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The Inevitable "Hello World" Program

/**
  HelloWorld program
  @author Marc Gysin
  @version 1.0
 */

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

• class HelloWorld
  • No "free" function so cannot just write void main ...

  • Must "wrap a class around" main function. In this case class HelloWorld { ... }

• System.out.println(...) is similar to printf(...) or cout << ... in C or C++.

Marc Gysin, James Cook University.

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