Java ThreadGroup isDaemon()方法

ThreadGroup類的isDaemon()方法測試此線程組是否為守護程式線程組。

語法

public final boolean isDaemon()

返回
如果此線程組是守護程式線程組，則此方法返回true。 否則，它將返回false。

示例

class NewThread extends Thread
{
    NewThread(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
    }
    public void run()
    {
        for(int i = 0;i < 10;i++)
        {
            i++;
        }
        System.out.println(Thread.currentThread().getName() + " finished executing");
    }
}
public class ThreadGroupIsDaemonExp
{
    public static void main(String arg[]) throws InterruptedException,
        SecurityException, Exception
    {
        // creating a threadGroup
        ThreadGroup tg = new ThreadGroup("Parent thread");
        // creating a thread
        NewThread t1 = new NewThread("Thread-1", tg);
        t1.start();

        // returns false if this thread group is not a daemon thread group
        System.out.println("Is " + tg.getName() + " a daemon threadGroup? " + tg.isDaemon());
    }
}

執行上面示例代碼，得到以下結果：

Is Parent thread a daemon threadGroup? false
Thread-1 finished executing