* 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
package com.heima.day25;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
public class Demo006 {
public static void main(String[] args) {
Print3 print = new Print3();
new Thread(){
public void run() {
for(int i=1;i<=100;i++){
try {
print.print1();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
}.start();
new Thread(){
public void run() {
for(int i=1;i<=100;i++){
try {
print.print2();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
}.start();
new Thread(){
public void run() {
for(int i=1;i<=100;i++){
try {
print.print3();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
}.start();
}
}
class Print3{
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{
/*
* 获取锁 这边相当于synchronized同步代码块
*/
r.lock();
if(flag != 1){
/*
* 相当于同步代码块中,锁对象.wait()
*/
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;
/*
* 在两个以上线程时候,之前只能通过锁对象.notifyAll()来唤醒其他所有的等待线程,
* 不能指定唤醒哪个线程。
* 使用Condition能指定唤醒哪个线程
*/
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;
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();
}
}