demobutton.java

Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套 代码

//Figure 8.28

import java.awt.event.*;
public class DemoButton extends EventButton  {	
	private int clickCount;
	
	/** post:	getX() == x  and  getY() == y  
	 *				and  getWidth() == 150  and  getHeight() == 30
	 *				and  getText() is "DEMO"   and  clickCount == 0  
	 */
    public DemoButton( int x, int y )  {
		super( "DEMO" );
		setBounds(x, y, 150, 30);
    	clickCount = 0;
    }

	/** post:	a message has been sent to standard output    */
	public void actionPerformed( ActionEvent e )   {
		clickCount++;
		System.out.println("Demo click count is " + clickCount );
	}
}