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這篇文章給大家分享的Java多線程實現生產者與消費者模型的代碼,相信大部分人都還沒學會這個技能,為了讓大家學會,給大家總結了以下內容,話不多說,一起往下看吧。
首先有一個阻塞隊列,生產者將生產的東西放到隊列里,消費者再從隊列中取。當隊列中的東西數量達到其容量就發生阻塞。
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<String> queue = new ArrayBlockingQueue<>(1);//1是隊列容量,超過就會阻塞。
// 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));//將消息放入隊列中
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();//從隊列中取走消息
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關鍵字修飾:給對象加鎖,保證線程安全,如果CPU發生任意調度,也不會線程不安全。
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;
}
}
線程間的通信
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類 有兩個屬性 兩個方法
final Person p =new Person();//new一個Person類對象p
new Thread(new Runnable(){//匿名線程
public void run(){//覆寫run方法
int x=0;
while(true){
if(x==0){
p.set("張三", "男");
}else{
p.set("lili", "nv");
}
x=(x+1)%2;
}
}
}).start();
new Thread(new Runnable(){
public void run(){
while(true){
p.get();
}
}
}).start();//啟動一個匿名線程
}
}
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