JButton的Text问题
我想在JButton上实现一个功能，最初JButton上显示“点击”，点击JButton后会出现倒计时功能，最后JButton消失。
即点击后出现10,过一秒后出现9，。。。。知道最后等于1，然后消失。
在监听器里我是这样写的：
public void mouseClicked(MouseEvent evt) {
while(num > 0){
jButton1.setText(num+"");
num--;
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
Logger.getLogger(NewJPanel.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
这段代码是直接显示最后那个数字的，有什么办法让数字逐一显示？
------解决方案--------------------不要堵塞当前线程Thread.sleep(1000); 要么新开一个线程，要么用timer控制
have a try
Java code
public void mouseClicked(MouseEvent evt) {
Object source = e.getSource();
if (source == jButton1 && jButton1.getEnabled()) {
jButton1.setEnabled(false);
final javax.swing.Timer t = new javax.swing.Timer(1000, new ActionListener(){
int num = 10;
public void actionPerformed(ActionEvent e) {
jButton1.setText(num+"");
num--;
if (num == 0) {
t.stop();
jButton1.setEnabled(true);
}
}
});
t.start();
}
}
------解决方案--------------------
对于SWING当中的定时器，JDK提供了javax.swing.Timer这个类，下面贴一个完整的Demo，你可以借鉴一下
Java code
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/**
* javax.swing.Timer的一个实例
* @author ioe_gaoyong
*
*/
public class NumberDemo extends JFrame{
private int number=10;//初始值为10
private JButton numBtn;
private Timer timer;
private class NumListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent event) {
// TODO Auto-generated method stub
numBtn.setText(number+"");
number--;
if (number == 0) {
numBtn.setText("stop");
timer.stop();
numBtn.setEnabled(true);
}
}
}
public NumberDemo(String title){
super(title);
numBtn=new JButton("Click");
numBtn.addMouseListener(new MouseListener(){
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
Object source = e.getSource();
if (source == numBtn && numBtn.isEnabled()) {
numBtn.setEnabled(false);
timer=new Timer(1000,new NumListener());
timer.start();
}
}
@Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
});
this.add(numBtn);
this.pack();
this.setLocationRelativeTo(null);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args){
new NumberDemo("NumberDemo");
}
}
------解决方案--------------------
顶楼上，用Timer
