Self explanatory Producer and Consumer problem

Producer.java

package com.producer;

import java.util.ArrayList;

import java.util.Random;

public class Producer implements Runnable{

//Engine Batch ID reference

ArrayList engineList;

//Engine No is stored here

String str;

//Assigning the BATCH ID reference

public Producer(ArrayList engineList) {

this.engineList = engineList;

}

/*

* Produce Engines

*/

public void produce(){

//Random number for engine number

str = ""+Math.abs(new Random(System.currentTimeMillis()).nextLong());

//Only one thread can enter the BATCH for any operation

synchronized (engineList) {

//Add the Engine to the batch

engineList.add(str);

//Notify all other threads that the new engine is added to the BATCH

engineList.notifyAll();

}

//Print Engine Number

System.out.println("Produced :: ENGINE CHASIS NO ["+ str + "]");

}

@Override

public void run() {

System.out.println("Production started");

//10 Engine is to be produced

for(int i=0;i<10;i++){

try {

//Produce the engine

this.produce();

//Sleep for 2 seconds for the next operation

Thread.sleep(2000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

Consumer.java

package com.producer;

import java.util.ArrayList;

public class Consumer extends Thread{

//Engine Batch ID reference

ArrayList<String> engineList;

//Engine No is stored here

String str;

//Assigning the BATCH ID reference

public Consumer(ArrayList<String> engineList) {

this.engineList = engineList;

}

/*

* Consume Engines from the BATCH

*/

public  void consume(int index) throws InterruptedException{

//Only one thread can enter the BATCH for any operation

synchronized (engineList) {

//if the Batch has no engines

while(engineList.size() == 0){

//then wait for some time until you get a new engine to consume

engineList.wait();

}

//If the engine is deployed to the BATCH

if(engineList.size() >= 0){

//The consume the engine from the respective position

str = engineList.get(index);

}

}

//Print Engine Number that it has been consumed

System.out.println("Consumed :: -------> ENGINE CHASIS NO ["+ str + "]" );

}

@Override

public void run() {

//10 Engine has to be consumed

for(int i=0;i<10;i++){

try {

//Produce the engine

this.consume(i);

//Sleep for 3 seconds for the next operation

Thread.sleep(3000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

Main.java

package com.producer;

import java.util.ArrayList;

public class Main {

public static void main(String[] args) throws InterruptedException {

//ArrayList to store the produced engines - BATCH

ArrayList<String> engine = new ArrayList<String>();

//Producer taking the engine BATCH ID Reference

Producer producer = new Producer(engine);

//Consumer taking the reference of the engine BATCH ID Reference

Consumer consumer = new Consumer(engine);

//Threads

Thread prodThread = new Thread(producer);

Thread conThread = new Thread(consumer);

//Starting the production

prodThread.start();

//Start Consumption

conThread.start();

}

}