Java多线程实现生产者与消费者模型
这篇文章给大家分享的Java多线程实现生产者与消费者模型的代码,相信大部分人都还没学会这个技能,为了让大家学会,给大家总结了以下内容,话不多说,一起往下看吧。
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首先有一个阻塞队列,生产者将生产的东西放到队列里,消费者再从队列中取。当队列中的东西数量达到其容量就发生阻塞。
import java.util.Random;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.PriorityBlockingQueue;
public class UseBlockingQueue {
private static BlockingQueue queue = new ArrayBlockingQueue<>(1);//1是队列容量,超过就会阻塞。
// new PriorityBlockingQueue<>();
// new LinkedBlockingQueue<>();
// new ArrayBlockingQueue<>(10);
private static class Producer extends Thread {
@Override
public void run() {
Random random = new Random(20191116);
while (true) {
try {
int message = random.nextInt(100);
queue.put(String.valueOf(message));//将消息放入队列中
System.out.println("放入消息: " + message);
Thread.sleep(random.nextInt(3) * 100);//睡眠
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
private static class Customer extends Thread {
@Override
public void run() {
Random random = new Random(20191116);
while (true) {
try {
String message = queue.take();//从队列中取走消息
System.out.println("收到消息: " + message);
Thread.sleep(random.nextInt(3) * 100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) {
Thread producer = new Producer();
Thread customer = new Customer();
producer.start();
customer.start();
}
}
synchronized关键字修饰:给对象加锁,保证线程安全,如果CPU发生任意调度,也不会线程不安全。
public class MyQueue2 {
private int[] array = new int[2];
private volatile int size;
private int front;
private int rear;
private Object full = new Object();
private Object empty = new Object();
public void put(int message) throws InterruptedException {
while (size == array.length) {
synchronized (full) {
full.wait();
}
}
synchronized (this) {
array[rear] = message;
rear = (rear + 1) % array.length;
size++;
}
synchronized (empty) {
empty.notify();
}
}
public synchronized int take() throws InterruptedException {
while (size == 0) {
synchronized (empty) {
empty.wait();
}
}
int message;
synchronized (this) {
message = array[front];
front = (front + 1) % array.length;
size--;
}
synchronized (full) {
full.notify();
}
return message;
}
}
线程间的通信
public class ThreadDemo {
public static void main(String[] args){
class Person{
public String name;
private String gender;
public void set(String name,String gender){
this.name =name;
this.gender =gender;
}
public void get(){
System.out.println(this.name+"...."+this.gender);
}
}//Person类 有两个属性 两个方法
final Person p =new Person();//new一个Person类对象p
new Thread(new Runnable(){//匿名线程
public void run(){//覆写run方法
int x=0;
while(true){
if(x==0){
p.set("张三", "男");
}else{
p.set("lili", "nv");
}
x=(x+1)%2;
}
}
}).start();
new Thread(new Runnable(){
public void run(){
while(true){
p.get();
}
}
}).start();//启动一个匿名线程
}
}
看完这篇文章,你们学会Java多线程实现生产者与消费者模型的方法了吗?如果还想学到更多技能或想了解更多相关内容,欢迎关注创新互联行业资讯频道,感谢各位的阅读。
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