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();
}
}
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This is one of the classic interview question related to multithreading. while sharing critical resource between multiple threads we also need to understand how to avoid deadlock in java.
Javin
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