java.lang.ThreadGroup.list()方法实例

java.lang.ThreadGroup.list()%uA0方法打印这个线程组到标准输出的信息。这仅用于调试。

声明

以下是java.lang.ThreadGroup.list()方法的声明

public void list()

参数

返回值

此方法不返回任何值。

异常

例子

下面的例子显示java.lang.ThreadGroup.list()方法的使用。

package com.yiibai

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")

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

         // listing contents of child ThreadGroup
         System.out.println("
Listing childThreadGroup : " +
         cGroup.getName() + ":")
         // prints information about this thread group to the standard output
         cGroup.list()

         // block until the other threads finish
         t1.join()
         t2.join()
      }
      catch (InterruptedException ex) {
         System.out.println(ex.toString())
      }
   }

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

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

让我们来编译和运行上面的程序，这将产生以下结果：

Starting Thread-0...
Starting Thread-1...

Listing parentThreadGroup: Parent ThreadGroup:
java.lang.ThreadGroup[name=Parent ThreadGroup,maxpri=10]
    Thread[Thread-0,5,Parent ThreadGroup]
    Thread-1 finished executing.
Thread-0 finished executing.
java.lang.ThreadGroup[name=Child ThreadGroup,maxpri=10]
        Thread[Thread-1,5,Child ThreadGroup]

Listing childThreadGroup : Child ThreadGroup:
java.lang.ThreadGroup[name=Child ThreadGroup,maxpri=10]
    Thread[Thread-1,5,Child ThreadGroup]

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声明

参数

返回值

异常

例子