Java ThreadGroup toString()用法及代碼示例

public String toString()

class NewThread extends Thread 
{
    NewThread(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
    }
    public void run()
    {
        for (int i = 0; i < 10; i++) 
        {
            try
            {
                Thread.sleep(10);
            }
            catch (InterruptedException ex) {
                System.out.println(Thread.currentThread().getName()
                                   + " interrupted"); }
        }
        System.out.println(Thread.currentThread().getName() + 
             " completed executing");
    }
} 
public class ThreadGroupToStringExp
{
    public static void main(String arg[])
    {
        // creating the thread group
        ThreadGroup tg1 = new ThreadGroup("parent thread group");
        ThreadGroup tg2 = new ThreadGroup(tg1, "child threadGroup");
   
        // creating a thread
        NewThread t1 = new NewThread("Thread-1", tg1);
        System.out.println(t1.getName() + " starts");
        t1.start();
        
        // creating another thread
        NewThread t2 = new NewThread("Thread-2", tg1);
        System.out.println(t2.getName() + " starts");
        t2.start();

        // string equivalent of the parent group
        System.out.println("String equivalent:"
                           + tg1.toString());
        
        // string equivalent of the child group
        System.out.println("String equivalent:"
                           + tg2.toString());
    }
}

Thread-1 starts
Thread-2 starts
String equivalent:java.lang.ThreadGroup[name=parent thread group,maxpri=10]
String equivalent:java.lang.ThreadGroup[name=child threadGroup,maxpri=10]
Thread-1 completed executing
Thread-2 completed executing