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在我的情况下使用线程池

[英]using thread pool in my case

原文 2014-08-03 13:55:29 4 1 java/ multithreading/ swing

I want to draw circles on the jpanel, where each circle should appear alternately on the random location with a different color and after for example 2000ms, it dies (disappears), and then appears a new one. 我想在jpanel上绘制圆圈，其中每个圆圈应该在随机位置上以不同的颜色交替出现，例如2000ms之后，它消失（消失），然后出现一个新的圆圈。

However, I want to use a thread pool with a 3 threads so that I can show 3 circles in the same time. 但是，我想使用一个具有3个线程的线程池，以便可以同时显示3个圆圈。

So now I'm not sure how should I execute CircleRunnable class and make this circles appear on the screen? 因此，现在我不确定如何执行CircleRunnable类并使该圆圈显示在屏幕上？

1 个解决方案

No, you shouldn't use multiple threads for this. 不，您不应为此使用多个线程。 Graphics isn't something that's generally multithreaded (as evidenced by Swing's Event/Paint thread). 图形通常不是多线程的（如Swing的事件/绘画线程所证明）。

Instead you should keep track of circles and their lifetimes in a suitable collection and handle that in a single thread. 相反，您应该在合适的集合中跟踪圆及其寿命，并在单个线程中进行处理。 For example creating a javax.swing.Timer and generating circles randomly each tick. 例如，创建一个javax.swing.Timer并在每个刻度上随机生成圆圈。

That way you can have hundreds of circles, and you won't shoot yourself in the foot with multithreading in a Swing program. 这样一来，您可以拥有数百个圆圈，而且您不会在Swing程序中使用多线程而步履蹒跚。