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ThreadGroup group = Thread.currentThread().getThreadGroup();
ThreadGroup topGroup = group;
// 遍历线程组树，获取根线程组
while (group != null) {
topGroup = group;
group = group.getParent();
}
// 激活的线程数加倍
int estimatedSize = topGroup.activeCount() * 2;
Thread[] slackList = new Thread[estimatedSize];
// 获取根线程组的所有线程
int actualSize = topGroup.enumerate(slackList);
// copy into a list that is the exact size
Thread[] list = new Thread;
System.arraycopy(slackList, 0, list, 0, actualSize);
System.out.println("Thread list size == " + list.length);
for (Thread thread : list) {
System.out.println(thread.getName());
}
转自：https://blog.csdn.net/Deronn/article/details/80247484
程序猿的技术大观园：www.javathinker.net
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Java技术网站 → 『 Java开发技术 』 → 『 Java编程技术专题 』 → 用于获得当前所有运行中线程的程序
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