题目 现在有生产者消费者两个线程 可以对初始值为0的一个变量进行操作
实现生产者线程对该变量加1 消费者线程立刻对该变量减1
实现交替 来10轮 (我们要求生产1个后 马上就进行消费)(消费一个后 就马上进行生产)
注意 生产者加1之后 消费者立马减1 结果应该是 1 0 1 0 1 0 …
传统版
package com.zyk;
//资源类
class ShareData{
private int number=0;
//生产者
public synchronized void increment() throws InterruptedException {
//1 判断
while(number!=0){
this.wait();
}
//2 干活
number++;
System.out.println(Thread.currentThread().getName()+"\t"+number);
//3 通知
this.notify();
}
//消费者
public synchronized void decrement() throws InterruptedException {
//1 判断
while(number==0){
this.wait();
}
//2 干活
number--;
System.out.println(Thread.currentThread().getName()+"\t"+number);
//3 通知
this.notify();
}
}
public class Product_ConsumerDemo1 {
public static void main(String[] args) {
ShareData shareData=new ShareData();
for (int i = 1; i <=10 ; i++) {
new Thread(()->{
try {
shareData.increment();
} catch (InterruptedException e) {
e.printStackTrace();
}
},"生产者").start();
}
for (int i = 1; i <=10 ; i++) {
new Thread(()->{
try {
shareData.decrement();
} catch (InterruptedException e) {
e.printStackTrace();
}
},"消费者").start();
}
}
}
Lock版
package com.zyk;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
class MyShare{
private int num=0;
private Lock lock=new ReentrantLock();
private Condition condition=lock.newCondition();
public void increment()throws Exception{
lock.lock();
try {
//判断
while (num!=0){
condition.await();
}
//干活
num++;
System.out.println(Thread.currentThread().getName()+"\t 生产了"+num);
//通知
condition.signalAll();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
public void decrement()throws Exception{
lock.lock();
try {
//判断
while (num==0){
condition.await();
}
//干活
num--;
System.out.println(Thread.currentThread().getName()+"\t 消费了"+num);
//通知
condition.signalAll();
} catch (Exception e) {
e.printStackTrace();
} finally {
lock.unlock();
}
}
}
public class Product_ConsumerDemo2 {
public static void main(String[] args) {
MyShare myShare=new MyShare();
new Thread(()->{
for (int i = 0; i <10 ; i++) {
try {
myShare.increment();
} catch (Exception e) {
e.printStackTrace();
}
}
},"AAA").start();
new Thread(()->{
for (int i = 0; i <10 ; i++) {
try {
myShare.decrement();
} catch (Exception e) {
e.printStackTrace();
}
}
},"BBB").start();
}
}