我的程式码如下,执行起来就是有种说不上来的怪... 就是可以拖曳,但是只要滑鼠停下来(左键依然按住)我的矩形就会消失... 所以我想请问大大们除了 mousePressed = 按下时触发 mouseDragged = 拖曳时触发 mouseReleased = 放开时触发 这些以外 有没有"左键按住不放且滑鼠不动"的触发写法 我想要是有的话应该就可以改善我的这个程式惹 可以告诉我吗 谢谢各位大大! /* * 此程式目的是在JFrame上画一个矩形并且可以利用滑鼠事件方式拖曳 */ package Strive; import java.awt.*; import java.awt.geom.*; import javax.swing.*; import java.awt.event.*; class CDrawF extends JFrame { private Point p1; //宣告Point CDrawF() { addMouseListener(new CDraw()); addMouseMotionListener(new CDraw()); setTitle("拖曳矩形"); setLayout(null); setBounds(50, 50, 300, 200); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } class CDraw extends MouseAdapter { //继承MouseAdapter MouseAdapter public void mousePressed(MouseEvent e){ //滑鼠按下触发画出矩形 p1 = e.getPoint(); Graphics2D g2 = (Graphics2D) getGraphics(); g2.setPaint(Color.red); g2.fill(new Rectangle2D.Double(p1.x, p1.y, 80, 80)); } public void mouseDragged(MouseEvent e){ //滑鼠拖曳触发画出矩形 p1 = e.getPoint(); Graphics2D g2 = (Graphics2D) getGraphics(); g2.setPaint(Color.red); g2.fill(new Rectangle2D.Double(p1.x, p1.y, 80, 80)); repaint(); } public void mouseReleased(MouseEvent e){ //滑鼠放开触发画出矩形 p1 = e.getPoint(); Graphics2D g2 = (Graphics2D) getGraphics(); g2.setPaint(Color.red); g2.fill(new Rectangle2D.Double(p1.x, p1.y, 80, 80)); } } } public class Exercise { //Main进入点 public static void main(String[] args){ new CDrawF(); } } --

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