如何从Thread更新java GUI？ [英] How to update java GUI from Thread?

问题描述

 private void StartActionPerformed(java.awt.event.ActionEvent evt) {

        Queue queue=new Queue();
        int target=Integer.parseInt(Target.getText());
        String path=Path.getText();
        final Producer p=new Producer(queue, target);
        Consumer c=new Consumer(queue);
        p.start();
        c.start();

        while(p.finish !=true)
        {
          Runnable r = new Runnable() {
            public void run() {
              ProgressPrecent.setValue(Producer.ProgressPercent);
            }
          };
          if(EventQueue.isDispatchThread()) {
            r.run();
          }
          else {
            EventQueue.invokeLater(r);
          }
       }
 }

我有两个课程共享队列。其中一个是Producer，它生成直到一个目标，另一个消耗这些元素。所有两个都扩展了Thread。我想向用户显示进度百分比，但它会冻结我的GUI，所以我该怎么办？

I have two classes that have a shared Queue. one of them is Producer that produces till a target other one consume those elements. all of two extends Thread. I want to display the progress percent to the user, but it freeze my GUI so what should I do?

推荐答案

• 工人主题默认永远不会调用 EventDispatchThread ，你有 Swing中的Concurency

  • Worker Threads by default never to invoked EventDispatchThread, you have issue with Concurency in Swing

    对Swing的所有更新GUI必须在EDT上完成

    all updates to Swing GUI must be done on EDT

    Runnable 可能是正确的方式，但 ProgressPrecent .setValue（Producer.ProgressPercent）; 必须包装在 invokeLater

    Runnable could be proper way but ProgressPrecent.setValue(Producer.ProgressPercent); must be wrapped in invokeLater

    代码

    SwingUtilities.invokeLater(new Runnable(){
        public void run(){
            ProgressPrecent.setValue(Producer.ProgressPercent);
        }
    }); 
    

    
    
    

    
    
    • 删除EDT测试，
    
    

    代码行

    if(EventQueue.isDispatchThread()) {
       r.run();
    }
    

    工人线程 by defaut永远不会调用EDT，然后从EDT启动无关紧要，也不测试 isDispatchThread（）不会让我有所作为

    Workers Thread by defaut never ever to invoke EDT, then doesn't matter if is started from EDT, nor tested for isDispatchThread() doesn't make me some sence

    
    

    • 永远不要在<$ c里面使用 Thread.sleep（int ） $ c> Swing Listeners ，因为导致了Swing GUI的崩溃

    • never ever, don't to use Thread.sleep(int) inside Swing Listeners, because caused freeze Swing GUI too

    我认为你可以使用这个职位的工作者也是

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