twolisteninner.java

用java编写的一些初级代码

//3.8
import java.awt.*;
import java.awt.event.*;
public class TwoListenInner{
    private Frame f;
    private TextField tf;
    public static void main(String args[]){
	TwoListenInner that=new TwoListenInner();
	that.go();
    }
    public void go(){
	f=new Frame("two listen example");
	f.add("North",new Label("Click and drag mouse"));
	tf=new TextField(30);
	f.add("South",tf);
	f.addMouseMotionListener(new MouseMotionHandler());
	f.addMouseListener(new MouseEventHandler());
	f.setSize(300,300);
	f.setVisible(true);
    }
    public class MouseMotionHandler extends MouseMotionAdapter{
	public void mouseDragged(MouseEvent e){
	    String s="Mouse drag:X="+e.getX()+"Y="+e.getY();
	    tf.setText(s);
	}
    }
    public class MouseEventHandler extends MouseAdapter{
	public void mouseEntered(MouseEvent e){
	    String s="mouse enter";
	    tf.setText(s);
	}
	public void mouseExited(MouseEvent e){
	    String s="mouse exit";
	    tf.setText(s);
	}
    }
}