Java ThreadGroup activeGroupCount()用法及代碼示例

ThreadGroup 類的 activeGroupCount() 方法返回此線程組及其子組中活動組的估計數量。返回值隻是一個估計值，因為在此方法遍曆內部數據結構時，線程組的數量可能會動態變化。

用法

public int activeGroupCount()

它返回以該線程組為祖先的活動線程組的數量。

示例

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 ThreadGroupActiveGroupExp
{
    public static void main(String arg[])
    {
        // creating the thread group
        ThreadGroup tg1 = new ThreadGroup("parent thread group");
        ThreadGroup tg2 = new ThreadGroup(tg1, "child threadGroup");
        ThreadGroup tg3 = new ThreadGroup(tg1, "child threadGroup");
   
        // creating the threads
        NewThread t1 = new NewThread("Thread-1", tg1);
        System.out.println(t1.getName() + " starts");
        // this will call the run() method
        t1.start();

        // checking the number of active thread
        System.out.println("Number of active thread group:"
                           + tg1.activeGroupCount());
    }
}

輸出：

Thread-1 starts
Number of active thread group:2
Thread-1 completed executing

相關用法

注：本文由純淨天空篩選整理自 Java ThreadGroup activeGroupCount() method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。