Java 實(shí)例 – 狀態(tài)監(jiān)測(cè)

Java 實(shí)例 - 狀態(tài)監(jiān)測(cè)

Java 實(shí)例

以下實(shí)例演示了如何通過(guò)繼承 Thread 類(lèi)并使用 currentThread.getName() 方法來(lái)監(jiān)測(cè)線程的狀態(tài)：

/*
 author by w3cschool.cn
 Main.java
 */

class MyThread extends Thread{
   boolean waiting= true;
   boolean ready= false;
   MyThread() {
   }
   public void run() {
      String thrdName = Thread.currentThread().getName();
      System.out.println(thrdName + " starting.");
      while(waiting) 
      System.out.println("waiting:"+waiting); 
      System.out.println("waiting...");
      startWait(); 
      try {
         Thread.sleep(1000);
      }
      catch(Exception exc) {
         System.out.println(thrdName + " interrupted.");
      }
      System.out.println(thrdName + " terminating.");
   }
   synchronized void startWait() {
      try {
         while(!ready) wait();
      }
      catch(InterruptedException exc) {
         System.out.println("wait() interrupted");
      }
   }
   synchronized void notice() {
      ready = true;
      notify();
   }
}
public class Main {
   public static void main(String args[]) 
   throws Exception{
      MyThread thrd = new MyThread();
      thrd.setName("MyThread #1");
      showThreadStatus(thrd);
      thrd.start();
      Thread.sleep(50);
      showThreadStatus(thrd);
      thrd.waiting = false;
      Thread.sleep(50); 
      showThreadStatus(thrd);
      thrd.notice();
      Thread.sleep(50);
      showThreadStatus(thrd);
      while(thrd.isAlive()) 
      System.out.println("alive");
      showThreadStatus(thrd);
   }
   static void showThreadStatus(Thread thrd) {
      System.out.println(thrd.getName() + "Alive:=" + thrd.isAlive() + " State:=" + thrd.getState());
   }
}

以上代碼運(yùn)行輸出結(jié)果為：

……
alive
alive
MyThread #1 terminating.
alive
……

Java 實(shí)例