Source of ExerciseHello.java

Structures and functions

public class ExerciseHello

  1: 
  2: import javax.swing.*;
  3: 
  4: public class ExerciseHello
  5: {
  6:    public static void main(String[] args)
  7:    {
  8:        JOptionPane.showMessageDialog(
  9:                       null, "Hello World!");
 10:        System.exit(0);
 11:    }
 12: }