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Java实现指定线程执行顺序的三种方式示例

2019年07月19日  | 移动技术网IT编程  | 我要评论

本文实例讲述了java实现指定线程执行顺序的三种方式。分享给大家供大家参考，具体如下：

方法一：通过共享对象锁加上可见变量来实现。

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();
    }
  }
}

执行结果：

可以看到线程的启动按顺序执行了。共享对象锁，可以保证每个方法只能同时有一个线程进入，配合wait和notifyall方法，可以启动或者唤醒线程。

方法二：通过主线程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：通过线程执行时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();
  }
}

更多java相关内容感兴趣的读者可查看本站专题：《java进程与线程操作技巧总结》、《java数据结构与算法教程》、《java操作dom节点技巧总结》、《java文件与目录操作技巧汇总》和《java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。

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