Java ThreadGroup list()方法

ThreadGroup類的list()方法用於顯示有關線程組的資訊。它僅適用於調試。

語法

public void list()

返回
此方法不返回任何值。

示例

class List extends Thread
{
    List(String threadname, ThreadGroup tgob)
    {
        super(tgob, threadname);
    }
    public void run()
    {
        for (int i = 0; i < 10; i++)
        {
            try
            {
                Thread.sleep(10);
            }
            catch (InterruptedException ex){
            }
        }
        System.out.println(Thread.currentThread().getName() + " completed executing");
    }
}
public class ThreadGroupListExp
{
    public static void main(String arg[]) throws InterruptedException,
        SecurityException, Exception
    {
        // creating the thread group
        ThreadGroup tg1 = new ThreadGroup("Parent thread");
        ThreadGroup tg2 = new ThreadGroup(tg1, "Child thread");

        // creating a thread
        List t1 = new List("Thread-1", tg1);
        System.out.println(t1.getName() +" starts");
        t1.start();

        // creating an another thread
        List t2 = new List("Thread-2", tg1);
        System.out.println(t2.getName() +" starts");
        t2.start();

        // listing contents of parent ThreadGroup
        System.out.println("\\nListing parentThreadGroup: " + tg1.getName() + ":");
        // prints information about this thread group to the standard output
        tg1.list();
    }
}

執行上面示例代碼，得到以下結果：

Thread-1 starts
Thread-2 starts

Listing parentThreadGroup: Parent thread:
java.lang.ThreadGroup[name=Parent thread,maxpri=10]
    Thread[Thread-1,5,Parent thread]
    Thread[Thread-2,5,Parent thread]
    java.lang.ThreadGroup[name=Child thread,maxpri=10]
Thread-1 completed executing
Thread-2 completed executing