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import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
public class ThreadTest {
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!");
}
}
}
}