MyRunnable mr = new MyRunnable();
Thread t1 = new Thread(mr, "张三");
Thread t2 = new Thread(mr, "李四");
//获取线程组
// 线程类里面的方法:public final ThreadGroup getThreadGroup()
ThreadGroup tg1 = t1.getThreadGroup();
ThreadGroup tg2 = t2.getThreadGroup();
// 线程组里面的方法:public final String getName()
String name1 = tg1.getName();
String name2 = tg2.getName();
System.out.println(name1);
System.out.println(name2);
System.out.println(Thread.currentThread().getThreadGroup().getName());
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