1.同步
使用ReentrantLock类的lock()和unlock()方法进行同步
2.通信
使用ReentrantLock类的newCondition()方法可以获取Condition对象
需要等待的时候使用Condition的await()方法, 唤醒的时候用signal()方法
不同的线程使用不同的Condition, 这样就能区分唤醒的时候找哪个线程了
/** * @param args */ public static void main(String[] args) { final Printer3 p = new Printer3(); new Thread() { public void run() { while(true) { try { p.print1(); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); new Thread() { public void run() { while(true) { try { p.print2(); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); new Thread() { public void run() { while(true) { try { p.print3(); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); }}class Printer3 { private ReentrantLock r = new ReentrantLock(); private Condition c1 = r.newCondition(); private Condition c2 = r.newCondition(); private Condition c3 = r.newCondition(); private int flag = 1; public void print1() throws InterruptedException { r.lock(); //获取锁 if(flag != 1) { c1.await(); } System.out.print("黑"); System.out.print("马"); System.out.print("程"); System.out.print("序"); System.out.print("员"); System.out.print("\r\n"); flag = 2; //this.notify(); //随机唤醒单个等待的线程 c2.signal(); r.unlock(); //释放锁 } public void print2() throws InterruptedException { r.lock(); if(flag != 2) { c2.await(); } System.out.print("传"); System.out.print("智"); System.out.print("播"); System.out.print("客"); System.out.print("\r\n"); flag = 3; //this.notify(); c3.signal(); r.unlock(); } public void print3() throws InterruptedException { r.lock(); if(flag != 3) { c3.await(); } System.out.print("i"); System.out.print("t"); System.out.print("h"); System.out.print("e"); System.out.print("i"); System.out.print("m"); System.out.print("a"); System.out.print("\r\n"); flag = 1; c1.signal(); r.unlock(); }