hasxy2.java

北京大学出版社的

package examples.inheritance;

/** An example Java subclass used to demonstrate
  * inheritance concepts
  */
public class HasXY2 extends HasX2 {

   private int y;

   /** Method to set the object's value
     * @param inputY The field's new value
     */
   public void setY( int inputY ) {
      y = inputY;
   }

   /** Method to get the object's value
     * @return The value of the field
     */
   public int getY() {
      return y;
   }

   /** Method to write the value of Y to
     * <code>System.out</code>.
     */
   public void showY() {
      System.out.println( y );
   }

   /** Method to write the value of X to
     * <code>System.out</code>. This is required
     * because this method is an abstract
     * method in the superclass.
     */
   public void showX() {
      System.out.println( getX() );
   }

   /** The test method for the class
     * @param args Not used
     */
   public static void main( String[] args ) {
      HasXY2 obj = new HasXY2();   
      obj.setY( 20 );
      obj.setX( 10 );
      obj.showY();
      obj.showX();
   }
}