学习java gui 的侦听器部分遇到小问题,求朋友帮忙解答,谢谢

Question

我把for循环部分直接放在go()方法内执行动画是可以移动的,但是我把for循环放到侦听器ActionListener()内动画就直接略过过程,点击按钮就只会卡一下跳到最后的坐标.请问一下这个是什么原因,怎么解决呢package gui; import java.awt.*; import javax.swing.*; import java.awt.event.*; public class SimpleAnimation { JFrame frame; JButton button; MyDrawPanel1 drawPanel1; int x=70; int y=70; public static void main (String[] args) { SimpleAnimation gui=new SimpleAnimation(); gui.go(); } public void go() { frame= new JFrame(); button=new JButton("Start"); drawPanel1=new MyDrawPanel1(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(BorderLayout.CENTER, drawPanel1); frame.getContentPane().add(BorderLayout.SOUTH,button); frame.setSize(400,400); myEvent(); frame.setVisible(true); /*这一段有问题... for(int i=0;i<130;i++) {        x++; y++; drawPanel1.repaint(); try { Thread.sleep(50); }catch(Exception ex) {} }*/ } public void myEvent() { button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { for(int i=0;i<130;i++) { x++; y++; drawPanel1.repaint(); System.out.println("正在执行..."); try { Thread.sleep(50); }catch(Exception ex) {} } }  }); } class MyDrawPanel1 extends JPanel{ private static final long serialVersionUID = 1L; public void paintComponent (Graphics g) { g.setColor(Color.green); g.fillOval(x, y, 40, 40); } } }

Answer 1

按钮点击事件如果没完成，整个窗口属于阻塞状态。所以如果点击后要处理的操作需要长时间完成，建议用线程封装。

    public void myEvent() {
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                new Thread(){
                public void run(){
                for(int i=0;i<130;i++) {
                    x++;
                    y++;
                    drawPanel1.repaint();
                    System.out.println("正在执行...");
                    try {
                        Thread.sleep(50);
                    }catch(Exception ex) {}
                }
                }
                }.start();
            }     
        });
    }