Java Thread getThreadGroup()方法

Thread類的getThreadGroup()方法用於返回該線程所屬的線程的線程組。 如果此線程已死(已停止)，則此方法返回null。

語法

public final ThreadGroup getThreadGroup()

返回
此方法返回線程的線程組。

示例

class JavaGetThreadGroupExp implements Runnable {
    public void run()
    {
        System.out.println("xuhuhu.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());
    }
}

執行上面示例代碼，得到以下結果：

Thread-1 is a member of ThreadGroup
Thread-2 is a member of AnotherGroup
xuhuhu.com
xuhuhu.com

上面的示例使用Thread類的getThreadGroup()方法獲取ThreadGroup的對象，然後使用getName()方法獲取線程組的名稱。