Java Java.lang.ThreadGroup.getMaxPriority()用法及代碼示例

描述

這個java.lang.ThreadGroup.getMaxPriority()方法返回此線程組的最大優先級。屬於該組的線程的優先級不能高於最大優先級。

聲明

以下是聲明java.lang.ThreadGroup.getMaxPriority()方法

public final int getMaxPriority()

參數

NA

返回值

此方法返回此線程組中的線程可以擁有的最大優先級。

異常

NA

示例

下麵的例子展示了 java.lang.ThreadGroup.getMaxPriority() 方法的用法。

package com.tutorialspoint;

import java.lang.*;

public class ThreadGroupDemo implements Runnable {
   public static void main(String[] args) {
      ThreadGroupDemo tg = new ThreadGroupDemo();
      tg.func();
   }

   public void func() {
      try {     
         // create a parent ThreadGroup
         ThreadGroup pGroup = new ThreadGroup("Parent ThreadGroup");
    
         // create a child ThreadGroup for parent ThreadGroup
         ThreadGroup cGroup = new ThreadGroup(pGroup, "Child ThreadGroup");

         // returns the maximum priority of parent thread group
         int i = pGroup.getMaxPriority();
         System.out.println("Maximum priority of ParentThreadGroup =" + i);

         // create a thread
         Thread t1 = new Thread(pGroup, this);
         System.out.println("Starting " + t1.getName() + "...");
         t1.start();
            
         // create another thread
         Thread t2 = new Thread(cGroup, this);
         System.out.println("Starting " + t2.getName() + "...");
         t2.start();
       
         // block until the other threads finish
         t1.join();
         t2.join();
      } catch (InterruptedException e) {
         System.out.println(e.toString());
      }
   }

   // implements run()
   public void run() {

      for(int i = 0;i < 1000;i++) {
         i++;
      }
      System.out.println(Thread.currentThread().getName() + " finished executing.");
   }
}

讓我們編譯並運行上麵的程序，這將產生以下結果——

Maximum priority of ParentThreadGroup =10
Starting Thread-0...
Starting Thread-1...
Thread-0 finished executing
Active threads in "Parent ThreadGroup" = 1
Thread-1 finished executing