Question

每次调用线程后，它的速度都会增加（具体来说 - FirstCircleRepaintThread，SecoundCircleRepaintThread，LineRepaintThread）。但主线程的速度是正常的。我已经阅读了this个问题，但我的帖子的速度总是增加。 GitHub，JAR on Dropbox 附：抱歉我的英文不好

Answer 1

问题是，每次unblock你创建一个新的线程实例，但是你没有停止旧的实例，所以它们仍在运行，更新你的用户界面

public void block() {
    setVisible(true);

    // Create a bunch of new threads...        
    firstCircleThr = new FirstCircleRepaintThread();
    firstCircleThr.setPriority(Thread.MAX_PRIORITY);
    firstCircleThr.start();
    secoundCircleThr = new SecoundCircleRepaintThread();
    secoundCircleThr.setPriority(Thread.MAX_PRIORITY);
    secoundCircleThr.start();
    lineThr = new LineRepaintThread();
    lineThr.setPriority(Thread.MAX_PRIORITY);
    lineThr.start();
}

public void unblock(){

    setVisible(false);
    // Dereference the old ones, but they are still running...        
    firstCircleThr = null;
    secoundCircleThr = null;
    lineThr = null;
    System.out.println("Yeah! OFF IT!");
}

例如......

public class FirstCircleRepaintThread extends Thread{


    public static final long SPEED_OF_ROTATING = 25L;

    @Override
    public void run(){
        //while(true){

            MainCycle.frame.panel.startAngleFirst = 34;
            int i = 0;

            Random r = new Random();

            // To infinity and beyond...                
            while(true){

你需要提供一些方法来阻止这些线程...而不需要调用stop ...

例如......

public class FirstCircleRepaintThread extends Thread{

    private volatile boolean keepRunning = true;

    public static final long SPEED_OF_ROTATING = 25L;

    public void kull() {

        keepRunning = false;
        interrupt();
        try {
            join();
        } catch (InterruptedException ex) {
        }

    }

    @Override
    public void run(){
        //while(true){

            MainCycle.frame.panel.startAngleFirst = 34;
            int i = 0;
            Random r = new Random();

            while(keepRunning){

现在使用block方法，您应该调用firstCircleThr.kull()，这将在返回之前停止Thread ...

如果您使用调试器或在循环之间将帧保持可见，您可能已经看到了这一点......

现在，说了这么多，你违反了单线程规则Swing，从事件调度线程以外的每个线程更新UI的状态。

查看Concurrency in Swing并考虑使用SwingWorker或Swing Timer。

您应该考虑尽可能少地保留后台进程，以便保持性能并降低更改模型和交互的复杂性

提高线程的速度

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