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Java實現(xiàn)指定線程執(zhí)行順序的三種方式示例

更新時間：2019年01月19日 11:02:41 作者：Leon-Zheng

這篇文章主要介紹了Java實現(xiàn)指定線程執(zhí)行順序的三種方式,包括通過共享對象鎖加上可見變量,通過主線程Join()以及通過線程執(zhí)行時Join()等三種實現(xiàn)方法,需要的朋友可以參考下

本文實例講述了Java實現(xiàn)指定線程執(zhí)行順序的三種方式。分享給大家供大家參考，具體如下：

方法一：通過共享對象鎖加上可見變量來實現(xiàn)。

public class MyService {
  private volatile int orderNum = 1;
  public synchronized void methodA() {
    try {
      while (orderNum != 1) {
        wait();
      }
      for (int i = 0; i < 2; i++) {
        System.out.println("AAAAA");
      }
      orderNum = 2;
      notifyAll();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }
  public synchronized void methodB() {
    try {
      while (orderNum != 2) {
        wait();
      }
      for (int i = 0; i < 2; i++) {
        System.out.println("BBBBB");
      }
      orderNum = 3;
      notifyAll();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }
  public synchronized void methodC() {
    try {
      while (orderNum != 3) {
        wait();
      }
      for (int i = 0; i < 2; i++) {
        System.out.println("CCCCC");
      }
      orderNum = 1;
      notifyAll();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }
}

import service.MyService;
public class ThreadAA extends Thread {
  private MyService dbtools;
  public ThreadAA(MyService dbtools) {
    super();
    this.dbtools = dbtools;
  }
  @Override
  public void run() {
    dbtools.methodA();
  }
}

import service.MyService;
public class ThreadBB extends Thread {
  private MyService dbtools;
  public ThreadBB(MyService dbtools) {
    super();
    this.dbtools = dbtools;
  }
  @Override
  public void run() {
    dbtools.methodB();
  }
}

import service.MyService;
public class ThreadCC extends Thread {
  private MyService dbtools;
  public ThreadCC(MyService dbtools) {
    this.dbtools = dbtools;
  }
  @Override
  public void run() {
    dbtools.methodC();
  }
}

import extthread.ThreadCC;
import service.MyService;
import extthread.ThreadAA;
import extthread.ThreadBB;
public class Run {
  public static void main(String[] args) {
    MyService myService = new MyService();
    for (int i = 0; i < 2; i++) {
      ThreadBB output = new ThreadBB(myService);
      output.start();
      ThreadAA input = new ThreadAA(myService);
      input.start();
      ThreadCC threadCC = new ThreadCC(myService);
      threadCC.start();
    }
  }
}

執(zhí)行結(jié)果：

可以看到線程的啟動按順序執(zhí)行了。共享對象鎖，可以保證每個方法只能同時有一個線程進入，配合wait和notifyall方法，可以啟動或者喚醒線程。

方法二：通過主線程Join()

class T11 extends Thread {
  public void run() {
    System.out.println("in T1");
  }
}
class T22 extends Thread {
  public void run() {
    System.out.println("in T2");
  }
}
class T33 extends Thread {
  public void run() {
    System.out.println("in T3");
  }
}
public class Test2 {
  public static void main(String[] args) throws InterruptedException {
    T11 t1 = new T11();
    T22 t2 = new T22();
    T33 t3 = new T33();
    t1.start();
    t1.join();
    t2.start();
    t2.join();
    t3.start();
  }
}

方法三：通過線程執(zhí)行時Join()

class T1 extends Thread {
  public void run(){
    Random random = new Random();
    try {
      Thread.sleep(random.nextInt(1000));
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    System.out.println("in T1");
  }
}
class T2 extends Thread{
  private Thread thread;
  public T2(Thread thread) {
    this.thread = thread;
  }
  public void run(){
    try {
      thread.join();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    System.out.println("in T2");
  }
}
class T3 extends Thread{
  private Thread thread;
  public T3(Thread thread) {
    this.thread = thread;
  }
  public void run(){
    try {
      thread.join();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    System.out.println("in T3");
  }
}
public class Test {
  public static void main(String[] args) throws InterruptedException {
    T1 t1 = new T1();
    T2 t2 = new T2(t1);
    T3 t3 = new T3(t2);
    t2.start();
    t1.start();
    t3.start();
  }
}

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希望本文所述對大家java程序設(shè)計有所幫助。

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