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  • java根据线程的id去获取线程

     public static void main(String[] args) {
            Thread t = new Thread(new InnerRunnable());
            t.start();
            System.out.println("        thread: " + t);
            long threadId = t.getId();
            
            // 一:通过线程组遍历获得线程
            Thread s = findThread(threadId);
            System.out.println("   find thread: " + s);
            System.out.println("current thread: " + Thread.currentThread());
                   
            
            // 二:通过 JMX 可以通过线程 ID 获得线程信息
            ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
            ThreadInfo info = tmx.getThreadInfo(threadId);
            System.out.println(info.getThreadState());
            
            
            s.interrupt();
        }
    
        /**
         * 通过线程组获得线程
         *
         * @param threadId
         * @return
         */
        public static Thread findThread(long threadId) {
            ThreadGroup group = Thread.currentThread().getThreadGroup();
            while(group != null) {
                Thread[] threads = new Thread[(int)(group.activeCount() * 1.2)];
                int count = group.enumerate(threads, true);
                for(int i = 0; i < count; i++) {
                    if(threadId == threads[i].getId()) {
                        return threads[i];
                    }
                }
                group = group.getParent();
            }
            return null;
        }
    
        private static class InnerRunnable implements Runnable {
    
            private int i = 0;
    
            public void run() {
                try {
                    while (!Thread.currentThread().isInterrupted()) {
                        System.out.println(i++);
                        Thread.sleep(10);
                    }
                } catch (InterruptedException e) {
                    System.out.println("mythread is interrupted!");
                }
            }
        }
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  • 原文地址:https://www.cnblogs.com/core404/p/6720323.html
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