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Java object wait notify notifyAll代碼解析

更新時間：2020年11月18日 10:09:29 作者：dint

這篇文章主要介紹了Java object wait notify notifyAll代碼解析,文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,需要的朋友可以參考下

測試代碼：

public static Object loc=new Object();

  public static void main(String[] args) throws Exception{

    Thread t1=new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          java.text.SimpleDateFormat sdf=new SimpleDateFormat("HH:mm:ss SSS");
          System.out.println("["+sdf.format(new Date())+"] t1___等待鎖...");
          synchronized (loc) {
            System.out.println("["+sdf.format(new Date())+"] t1___獲得鎖 ...");
            Thread.sleep(5000);
            System.out.println("["+sdf.format(new Date())+"] t1___loc..開始執(zhí)行wait...");
            loc.wait();
            System.out.println("["+sdf.format(new Date())+"] t1___loc..執(zhí)行wait后續(xù)...");
            Thread.sleep(1000);
          }
          System.out.println("["+sdf.format(new Date())+"] t1___loc..離開鎖...");
        }catch (Exception e){
          e.printStackTrace();
        }
      }
    });
    Thread t3=new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          java.text.SimpleDateFormat sdf=new SimpleDateFormat("HH:mm:ss SSS");
          System.out.println("["+sdf.format(new Date())+"] t3___等待鎖...");
          synchronized (loc) {
            System.out.println("["+sdf.format(new Date())+"] t3___進入鎖...");
            Thread.sleep(5000);
            System.out.println("["+sdf.format(new Date())+"] t3___loc..開始 wait...");
            loc.wait();
            System.out.println("["+sdf.format(new Date())+"] t3___loc..執(zhí)行 wait后續(xù)...");
            Thread.sleep(1000);
          }
          System.out.println("["+sdf.format(new Date())+"] t3___離開鎖...");
        }catch (Exception e){
          e.printStackTrace();
        }
      }
    });

    Thread t2=new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          java.text.SimpleDateFormat sdf=new SimpleDateFormat("HH:mm:ss SSS");
          System.out.println("["+sdf.format(new Date())+"] t2___等待鎖...");
          synchronized (loc) {
            System.out.println("["+sdf.format(new Date())+"] t2___獲得鎖...");
            Thread.sleep(5000);
            System.out.println("["+sdf.format(new Date())+"] t2___loc..開始執(zhí)行 notify...");
            loc.notify();
            System.out.println("["+sdf.format(new Date())+"] t2___loc..執(zhí)行 notify后續(xù)...");
            Thread.sleep(1000);
          }
          System.out.println("["+sdf.format(new Date())+"] t2___loc 離開鎖....");
        }catch (Exception e){
          e.printStackTrace();
        }
      }
    });
    t1.start();
    t3.start();
    Thread.sleep(500);
    t2.start();


    System.out.println("t1___before join ....");
    t1.join();
    System.out.println("t2___before join ....");
    t2.join();
    System.out.println("t3____before join ....");
    t3.join();
    System.out.println("main exit....");
  }

執(zhí)行結(jié)果:

[16:55:59 384] t1___等待鎖...

[16:55:59 384] t1___獲得鎖 ...

[16:55:59 384] t3___等待鎖...
t1___before join ....
[16:55:59 836] t2___等待鎖...
[16:56:04 392] t1___loc..開始執(zhí)行wait...

[16:56:04 392] t2___獲得鎖...
[16:56:09 392] t2___loc..開始執(zhí)行 notify...
[16:56:09 392] t2___loc..執(zhí)行 notify后續(xù)...
[16:56:10 392] t2___loc 離開鎖....

[16:56:10 392] t3___進入鎖...
[16:56:15 392] t3___loc..開始 wait...
[16:56:15 392] t1___loc..執(zhí)行wait后續(xù)...
[16:56:16 392] t1___loc..離開鎖...
t2___before join ....
t3____before join ....