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。