java多线程应用——生产者消费者

 

import java.util.Random;/**@topic:用互斥实现生产者消费者问题*/public class Custom{public static void main(String[] args) {FruitBasket fb = new FruitBasket();new Thread(new Farmer("农夫1",fb)).start();new Thread(new Farmer("农夫2",fb)).start();new Thread(new Farmer("农夫3",fb)).start();new Thread(new Child("小孩1",fb)).start();new Thread(new Child("小孩2",fb)).start();new Thread(new Child("小孩3",fb)).start();}}class Fruit{private int id;private static int number = 0;private String variety;private String[] varietys = "苹果,桃子,梨子,香蕉,西瓜,荔枝,葡萄".split(",");public Fruit(){this.variety = varietys[new Random().nextInt(7)];this.id = ++number;}public int getId(){return this.id;}public String getVariety(){return this.variety;}}class FruitBasket{private Fruit[] fruits = new Fruit[10];//容量为10的水果数组private int index = 0;//下一个将要放入水果的位置public boolean isEmpty(){//判断水果篮是否为空return index == 0 ?true:false;}public boolean isFull(){//是否为满return index == fruits.length?true:false;}public synchronized void push(String name , Fruit fruit){//对push方法实行同步while(isFull()){try{    this.wait();//若为满，则不能push，只能等待。}catch(InterruptedException e){    e.printStackTrace();}}fruits[index++] = fruit;System.out.println(name + "向水果框中放入编号为" + fruit.getId() + "的"+fruit.getVariety());display();this.notify();//通知另一线程}public synchronized Fruit pop(String name){while(isEmpty()){try{    this.wait();}catch(Exception e){    e.printStackTrace();}}Fruit fruit = fruits[--index];System.out.println(name + "从水果框中拿出编号为"+fruit.getId() +"的" + fruit.getVariety());display();this.notify();return fruit;}public void display(){for(int i = 0 ; i < index ; i++){System.out.printf(fruits[i].getId()+fruits[i].getVariety() + " |");}for (int i = index; i < fruits.length; i++) {System.out.printf( "[" + (i + 1) + "]|");}System.out.println("\n");}}class Farmer implements Runnable{private String name ;private FruitBasket fruitBasket;public void run(){//不断往篮子中放while(true){fruitBasket.push(name,new Fruit());try{    Thread.sleep(new Random().nextInt(2000));}catch(Exception e){    e.printStackTrace();}}}Farmer(String name, FruitBasket fruitBasket) {this.name = name;this.fruitBasket = fruitBasket;}}class Child implements Runnable{private String name;private FruitBasket fruitBasket;public void run(){//不断往篮子中取while(true){fruitBasket.pop(this.name);try{    Thread.sleep(new Random().nextInt(5000));}catch(Exception e){    e.printStackTrace();}}}Child(String name, FruitBasket fruitBasket) {this.name = name;this.fruitBasket = fruitBasket;}}