点击文字 鼠标拖动 文字会随鼠标拖动

package chapter16;

import java.awt.BorderLayout;

import java.awt.Graphics;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionListener;

import javax.swing.JFrame;

import javax.swing.JPanel;

@SuppressWarnings("serial")

public class MoveMessageDemo extends JFrame{

public MoveMessageDemo(){

MoveableMessagePanel p = new MoveableMessagePanel();

setLayout(new BorderLayout());

add(p);

}

public static void main(String[] args) {

MoveMessageDemo frame = new MoveMessageDemo();

frame.setLocationRelativeTo(null); // Center the frame

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setTitle("AdapterDemo");

frame.setSize(220, 200);

frame.setVisible(true);

}

class MoveableMessagePanel extends JPanel{

private String message = "this is a test";

private int x = 20;

private int y = 20;

public MoveableMessagePanel(){

addMouseMotionListener(new MouseMotionListener() {

@Override

public void mouseDragged(java.awt.event.MouseEvent e) {

x=e.getX();

y=e.getY();

repaint();

}

@Override

public void mouseMoved(MouseEvent e) {

}

});

}

public MoveableMessagePanel(String string) {

message = string;

addMouseMotionListener(new MouseMotionListener() {

@Override

public void mouseDragged(java.awt.event.MouseEvent e) {

x=e.getX();

y=e.getY();

repaint();

}

@Override

public void mouseMoved(MouseEvent e) {

}

});

}

protected void paintComponent(Graphics g) {

super.paintComponent(g);

g.drawString(message, x, y);

}

}

}

原文：http://blog.csdn.net/qq_24653023/article/details/52214897