【Condition有序打印ABCD】编写一个程序，开启 3个线程，这 3个线程的 ID分别为 A、 B、 C，每个线程将自己的 ID在屏幕上打印 10遍，要求输出结果必须按 ABC的顺序显示；如： ABCABC….依次递推。
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
/**
* @author zjq
* @date 2020/3/25 16:56
*
* 循环打印ADC
*/
public class pcC {
public static void main(String[] args) {
Data3 data3 = new Data3();
new Thread(()->{
for(int i=0;
i<10;
i++){
data3.printA();
}
},"A").start();
new Thread(()->{
for(int i=0;
i<10;
i++){
data3.printB();
}
},"B").start();
new Thread(()->{
for(int i=0;
i<10;
i++){
data3.printC();
}
},"C").start();
}
}
class Data3{//资源类用Lock
private Lock lock = new ReentrantLock();
Condition condition1 = lock.newCondition();
Condition condition2 = lock.newCondition();
Condition condition3 = lock.newCondition();
private int num = 1;
//num=1 A;
num = 2 B;
num =3 C
public void printA(){
lock.lock();
try {
//业务
while(num!=1){
condition1.await();
}
System.out.println(Thread.currentThread().getName()+"=======A");
//唤醒指定的线程
num = 2;
condition2.signal();
}catch (Exception e){
e.printStackTrace();
}finally {
lock.unlock();
}}
public void printB(){
lock.lock();
try {
//业务，判断-》执行-》通知
while(num!=2){
condition2.await();
}
System.out.println(Thread.currentThread().getName()+"=========B");
num = 3;
condition3.signal();
}catch (Exception e){
e.printStackTrace();
}finally {
lock.unlock();
}
}
public void printC(){
lock.lock();
try {
//业务
while (num!=3){
condition3.await();
}
System.out.println(Thread.currentThread().getName()+"========C");
num = 1;
condition1.signal();
}catch (Exception e){
e.printStackTrace();
}finally {
lock.unlock();
}
}}
