线程中使用 javax.swing.Timer的问题

Question

这样一段代码，希望能够在执行的时候，显示一个进度条。但是每次进度条都要等到执行完了才显示出来，为什么呢？ 
 
            Progress p=new Progress(poi); 
            Thread th=new Thread(p); 
            try{ 
                th.start(); 
                //一段需要很长时间的代码 
                //th.interrupt(); 
            }catch(Exception e){ 
                //th.interrupt(); 
            } 
 
 
 
package com.ui; 
 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.*; 
import javax.swing.Timer; 
 
public class Progress implements Runnable { 
    Timer tm; 
    ProgressMonitor pm; 
    JFrame poi; 
    int i; 
    public Progress(JFrame poi){ 
        this.poi=poi; 
    } 
    public void run() { 
        ActionListener actionListener=new ActionListener(){ 
            public void actionPerformed(ActionEvent e){ 
                pm.setProgress(++i==100?1:i); 
            } 
        }; 
        System.out.println(123); 
        tm=new Timer(200,actionListener); 
        pm=new ProgressMonitor(poi,"","正在导入，请稍候...",1,100); 
        pm.setMillisToDecideToPopup(0); 
        pm.setMillisToPopup(0); 
        tm.start(); 
    } 
} 
 

Answer 1

import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import javax.swing.*;  
import javax.swing.Timer;  
  
public class Progress implements Runnable { 
static boolean check=false;
    Timer tm;  
    ProgressMonitor pm;  
    static JFrame poi;  
    int i;  
    public Progress(JFrame poi){  
        this.poi=poi;  
    }  
    public void run() {  
        ActionListener actionListener=new ActionListener(){  
            public void actionPerformed(ActionEvent e){          
                pm.setProgress(++i==100?101:i);  
                check=true;
                dorun();
            }             
        };  
        if(check){
         
       }
        tm=new Timer(50,actionListener); 
        pm=new ProgressMonitor(poi,"","正在导入，请稍候...",1,100);  
        pm.setMillisToDecideToPopup(0);  
        pm.setMillisToPopup(0);  
        tm.start();         
    }
    public void dorun(){
     if(i==101){
     System.out.println("##############"+"123"); 
     }
    }
    public static void main(String args[]){
        Progress p=new Progress(poi);  
        Thread th=new Thread(p);  
        try{  
            th.start();  
            //一段需要很长时间的代码  
            //th.interrupt();  
        }catch(Exception e){  
            //th.interrupt();  
        }  
    }
} 
我不太明白你的意思所以就照着我的意思改了一下 
以前没用过线程，有些地方可能有问题，希望和你探讨．我现在想学这个．呵呵还望不吝赐教！！！