填空题 下列JApplet对鼠标单击事件进行处理，当鼠标在JPanel中单击时，在JLabel中显示单击次数。请在横线处填写正确的代码{{U}} 【15】 {{/U}}。 import java.awt.event.*; import javax.swing.*; import java.awt.*; public class Test extends JApplet { static int cnt; public void init() { Container cp = getContentPane(); MyPane jp = new MyPane1(); _______; jp.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent me) { cnt ++; jb.setText(Integer.toString(cnt}); } }); cp.add("South",jB) ; cp. add ("Center", jp); } } class MuPanel extends JPanel { public MyPanel() {} public void paintComponent(Graphics g) { super.panitComponent(g); g.drawRect(0,0,getSize() .width-1,getSize() .hight-1); } }