Question

java中怎么样让鼠标点击窗体 绘制出一个矩形 帮我看看我的代为为什么绘制不会来 那里错了

package jmouse;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class JMouse {

public static void main(String[] args) {
MyJFrame mf = new MyJFrame();
}
}

class MyJFrame extends JFrame{
public MyJFrame(){
MyJPanel mp = new MyJPanel();
this.setSize(600,500);
this.setTitle("鼠标点击在窗体上绘制矩形");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.add(mp);
this.setVisible(true);
}
}
class MyJPanel extends JPanel{
public MyJPanel(){
this.addMouseListener(new mouselistener());
this.addMouseMotionListener(new mouselistener());
this.setFocusable(true);
}

}
class mouselistener implements MouseListener,MouseMotionListener{

private int x;
private int y;

@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub

}

@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub

}

@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub

}

@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
repaint();
}

@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub

}

@Override
public void mouseDragged(MouseEvent e) {
// TODO Auto-generated method stub

}

@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
x = e.getX();
y = e.getY();
}

public void paintComponent(Graphics g){
Graphics2D g2 = (Graphics2D)g;
Rectangle2D rect = new Rectangle2D.Double(x,y,100,100);
g2.draw(rect);
}

}
repaint();编译器报错的
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
repaint();
}

Answer 1

是MouseClicked事件