Thread

 package com.citibank.aimy.Examples.serialize;public class MainThread {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubProductBox b = new ProductBox();Producer p = new Producer(b);Consumer c = new Consumer(b);p.setPriority(Thread.MAX_PRIORITY);p.start();c.start();//Product[] ls = new Product[6];//System.out.print(ls.length);}}

package com.citibank.aimy.Examples.serialize;public class Producer extends Thread {private ProductBox b;public Producer(ProductBox box){this.b = box;}public void run(){for(int i=0;i<10;i++){Product p = new Product("Product::"+i);b.push(p);}try {Thread.sleep((long) (Math.random()*200));} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

package com.citibank.aimy.Examples.serialize;public class Product {public Product(int id){this.id = id;}public Product(String name){this.name = name;}private String name;private String color;private String scale;private int id;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getScale() {return scale;}public void setScale(String scale) {this.scale = scale;}} package com.citibank.aimy.Examples.serialize;import java.util.ArrayList;public class ProductBox {private ArrayList ls = new ArrayList();private int index = 0;//create 4 products one time.public synchronized void push(){while(index<10){while(index==8)try {this.wait();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("produce a new product:::"+index);Product p = new Product(index);ls.add(p);System.out.println("add a new product:::"+((Product)ls.get(index)).getId());index++;this.notify();}}public synchronized void push(Product p){while(index<10){while(index==8)//try {this.wait();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}//System.out.println("produce a new product:::"+index);ls.add(p);System.out.println("add a new product:::"+((Product)ls.get(index)).getName());index++;this.notify();}}public synchronized void pop(){while(index<10){while(index==0)try {this.wait();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}//System.out.println("comsume a new product:::"+(index-1));Product r = (Product) ls.remove(index-1);System.out.println("remove a new product:::"+r.getName());index--;this.notify();}}}

package com.citibank.aimy.Examples.serialize;public class Consumer extends Thread {private ProductBox b;public Consumer(ProductBox box){this.b = box;}public void run(){for(int i=0;i<10;i++){b.pop();}try {Thread.sleep((long) (Math.random()*200));} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

 

In Producer.run(), the for-loop will never increment i to 1. As whenever the productBox add the product 8 times leaving index to be 8, it waits until the consumer consumes all the 8 product, leaving the index to be 0 again, and the producer wakes up to see that index is again 0 and do it again. It will forever loop and never stop.