fordemo.java

JAVA 2应用开发指南

//forDemo.Java
import javax.swing.JOptionPane;
  public class forDemo {    
     // main method begins execution of Java application
      public static void main( String args[] )
      {
         int sum = 0;
         // sum even integers from 2 through 100
         for ( int number = 2; number <= 100; number += 2 )
            sum += number;
         // display results
         JOptionPane.showMessageDialog( null, "The sum is " + sum,
            "Sum Even Integers from 2 to 100",
            JOptionPane.INFORMATION_MESSAGE );
         System.exit( 0 );   // terminate the application
   }  // end method main
}