java中的非法状态异常

我在运行代码时遇到此异常。尽管代码运行良好，但我在终端上遇到了一些异常

Exception in thread "AWT-EventQueue-1" java.lang.IllegalThreadStateException
    at java.lang.Thread.start(Thread.java:708)
    at SR.start(SR.java:38)
    at SR.mouseClicked(SR.java:212)
    at java.awt.Component.processMouseEvent(Component.java:6536)
    at java.awt.Component.processEvent(Component.java:6298)
    at java.awt.Container.processEvent(Container.java:2236)
    at java.awt.Window.processEvent(Window.java:2025)
    at java.awt.Component.dispatchEventImpl(Component.java:4889)
    at java.awt.Container.dispatchEventImpl(Container.java:2294)
    at java.awt.Window.dispatchEventImpl(Window.java:2746)
    at java.awt.Component.dispatchEvent(Component.java:4711)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
    at java.awt.EventQueue$4.run(EventQueue.java:731)
    at java.awt.EventQueue$4.run(EventQueue.java:729)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
    at org.GNOME.Accessibility.AtkWrapper$5.dispatchEvent(AtkWrapper.java:700)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

我做错了什么

我的启动方法

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您似乎要启动同一线程两次，这是不允许的

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如果您希望重用同一个线程，我建议您改为创建ExecutorService。

问题是，如果HelperThread不为null，那么它已经存在，您可以调用HelperThread.start is尝试启动一个已经启动或完成其处理的线程。如果要重新启动处理，必须先停止线程。要优雅地执行此操作，请在实际线程中使用while运行{}模式。然后，int start方法，将标志设置为false，等待线程死亡，然后启动一个新线程：

private void start() throws IllegalStateException {
    if (HelperThread != null) {
        running = false;
        HelperThread.join(); // wait for it to die...
    }

    // Start fresh...
    HelperThread = new Thread(this);
    HelperThread.start();
}

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另外，作为旁注，避免使用大写字母作为变量的第一个字母。它应该是helperThread。

那么，您试图启动一个已经完成的线程？我要附加代码吗？我已经给出了启动方法，无法启动一个已经完成的线程。您是否有可能启动同一个线程两次？这是一个反问句。哇！解决了

private void start() throws IllegalStateException {
    if (HelperThread != null) {
        running = false;
        HelperThread.join(); // wait for it to die...
    }

    // Start fresh...
    HelperThread = new Thread(this);
    HelperThread.start();
}