问答题

当按下鼠标时，一个圆不断地增大半径。 注意：请勿改动已有语句内容，仅在下划线处填入适当的语句。 import java.applet.*; import java.awt.*; import java.awt.event.*; public class ex1 extends applet implements MouseListener { TextField text; int x; public void init() { x=6; text=new TextField(30); add(text); addMouseListener(this); } public void paint(Graphics g) { x= x+2; g.drawOval(10,10,x,x); } public void mousePressed(MouseEvent e) { Text.setText("鼠标按下的位置是："+e.getX()+","e.getY()); repaint(); } public void mouseReleased(MouseEvent e) { Text.setText("鼠标松开的位置是："+e.getX()+","e.getY()); repaint(); } public void mouseEntered(MouseEvent e) { Text.setText("鼠标进来的位置是："+e.getX()+","e.getY()); repaint(); } public void mouseExited(MouseEvent e) { Text.setText("鼠标退出的位置是："+e.getX()+","e.getY()); ______; } }