app16_8.java

来自「JAVA 2面向对象程序设计(随书范例程序)16-19.rar」· Java 代码 · 共 45 行

// app16_8, 以MouseListener接口处理MouseEvent事件
import java.awt.*;
import java.awt.event.*;
public class app16_8 extends Frame implements MouseListener
{
   static app16_8 frm=new app16_8(); 
   static Button btn=new Button(" Click Me!! ");
   static TextArea txa=new TextArea("",2,5,TextArea.SCROLLBARS_NONE);
   
   public static void main(String args[])
   {
      BorderLayout br=new BorderLayout(2,5);
      frm.setSize(200,150);
      frm.setTitle("Mouse Event");
      frm.setLayout(br);
      btn.addMouseListener(frm);  // 设置frm为btn的聆听者
      txa.setEditable(false); 
      frm.add(btn,br.WEST); 
      frm.add(txa,br.CENTER);
      frm.setVisible(true); 
   }
   
   public void mouseEntered(MouseEvent e) // 鼠标的指针进入btn上方
   {
      txa.setText("Mouse entered\n");
   } 
   public void mouseClicked(MouseEvent e) // 按下并放开鼠标按钮
   {
      txa.append("Mouse clicked\n");
   }
   public void mouseExited(MouseEvent e)   // 鼠标的指针移开btn上方
   { 
      txa.append("Mouse exited\n");
   } 
   public void mousePressed(MouseEvent e) // 按下鼠标的按钮
   {
      txa.append("Mouse pressed\n");
   } 
   public void mouseReleased(MouseEvent e) // 放开鼠标按钮
   {
      txa.append("Mouse released\n");
   }
}