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
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
public class Demo3_ReentrantLock {
/**
* @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("\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("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("hk");
System.out.print("\r\n");
flag = 1;
c1.signal();
r.unlock();
}
}