arraydemo.java

本书结合作者丰富的实践经验和深厚的理论基础

//ArrayDemo.java
import java.awt.Container;
import javax.swing.*;    
  public class ArrayDemo extends JApplet {   
      // initialize applet 
      public void init()
      {
         JTextArea outputArea = new JTextArea();
         Container container = getContentPane();
         container.add( outputArea );   
         int array[] = { 1, 2, 3, 4, 5 };
         String output ="Effects of passing entire array by reference:\n" + "The values of the original array are:\n";         // append original array elements to String output 
         for ( int counter = 0; counter < array.length; counter++ )
            output += "   " + array[ counter ];      
         modifyArray( array );  // array passed by reference      
         output += "\n\nThe values of the modified array are:\n";   
         // append modified array elements to String output 
	for ( int counter = 0; counter < array.length; counter++ )
            output += "   " + array[ counter ];
         outputArea.setText( output );        
      }  // end method init      
      // multiply each element of an array by 2 
      public void modifyArray( int array2[] )
      {
         for ( int counter = 0; counter < array2.length; counter++ )
            array2[ counter ] *= 2;
      }      
      // multiply argument by 2
      public void modifyElement( int element )
      {
         element *= 2;
      } 
}