送分！JTextField的显示刷新的问题

Question

我写如下语句：
for (int i = 0 ; i<amount ; i++){
    jtf.setText("共有"+amount+"户，目前处理第"(i+1)+"户，已完成"+((i+1)*100/amount)+"%");
}显示的时候只显示最后的100%的一个界面
我想让这个JTextField随时刷新显示（或每加1%就刷新显示一次之类的也行），怎么办？
因为这个工作可能会处理很长时间。

Answer 1

通过线程控制。public void run()
{
   while(i<amount)
   {
      jtf.setText("共有"+amount+"户，目前处理第"(i+1)+"户，已完成"+((i+1)*100/amount)+"%");
      try
      {
         Thread.sleep(35);
      }
      catch(InterruptedException e){}
      i++;
   }
}

Answer 2

通过线程控制。public void run()
{
   while(i<amount)
   {
      jtf.setText("共有"+amount+"户，目前处理第"(i+1)+"户，已完成"+((i+1)*100/amount)+"%");
      try
      {
         Thread.sleep(30);//30--the length of time to sleep in milliseconds.       }
      catch(InterruptedException e){}
      i++;
   }
}
-----
呵呵^_^

Answer 3

for (int i = 0 ; i<amount ; i++){
SwingUtilities.invokeLater(new Runnable() {
public void run() {
   jtf.setText(...);
}
});
}

Answer 4

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;public class RefreshTest {
    public static void main(String[] args) {
        final JTextField tf = new JTextField(40);
        JButton btn = new JButton("Start");
        btn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                new Thread() {
                    public void run() {
                        final int amount = 100;
                        for (int i = 0; i < amount; i++) {
                            final int t = i;
                            SwingUtilities.invokeLater(new Runnable() {
                                public void run() {
                                    tf.setText("共有" + amount + "户，目前处理第" + (t + 1)
                                            + "户，已完成" + ((t + 1) * 100 / amount) + "%");
                                }
                            });
                            try {
                                Thread.sleep(10);
                            } catch (InterruptedException e) {
                            }
                        }
                    };
                }.start();
            }
        });        JFrame f = new JFrame();
        f.getContentPane().add(tf, BorderLayout.CENTER);
        f.getContentPane().add(btn, BorderLayout.SOUTH);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.pack();
        f.setLocationRelativeTo(null);
        f.show();
    }
}