Thread类的getThreadGroup()方法用于返回该线程所属的线程的线程组。 如果此线程已死(已停止)，则此方法返回null。
语法
public final ThreadGroup getThreadGroup()
返回
此方法返回线程的线程组。
示例
class JavaGetThreadGroupExp implements Runnable {
public void run()
{
System.out.println("yiibai.com");
}
}
public class GetThreadGroup
{
public static void main(String[] args)
{
// create thread groups
ThreadGroup group = new ThreadGroup("ThreadGroup");
ThreadGroup anotherGroup = new ThreadGroup(group, "AnotherGroup");
// create threads and placed into thread group
Thread t1 = new Thread(group, new JavaGetThreadGroupExp(), "Thread-1");
Thread t2 = new Thread(anotherGroup, new JavaGetThreadGroupExp(), "Thread-2");
// Start the threads
t1.start();
t2.start();
// returns the Thread Group to which this thread belongs
System.out.println(t1.getName() +" is a member of " + t1.getThreadGroup().getName());
System.out.println(t2.getName()+ " is a member of "+ t2.getThreadGroup().getName());
}
}
执行上面示例代码，得到以下结果：
Thread-1 is a member of ThreadGroup
Thread-2 is a member of AnotherGroup
yiibai.com
yiibai.com
上面的示例使用Thread类的getThreadGroup()方法获取ThreadGroup的对象，然后使用getName()方法获取线程组的名称。
