Java Program to print Even and Odd Numbers Using 2 Threads

In this post, we will learn How to write a java program to print Even and Odd Numbers Using 2 Threads.
In the previous post, we already had seen How to Print numbers in sequence using 3 Threads
This problem statement follows a similar logic.

NumbersGenerator.java is used by both threads to print odd and even numbers

package com.kkjavatutorials.resource;
/**
 * 
 * @author KK JavaTutorials
 * NumbersGenerator is used by 2 threads to generate numbers in Sequence
 */
public class NumbersGenerator {

	private int number = 1;
	private int numberOfThreads;
	private int totalNumbersInSequence;
	
	public NumbersGenerator(int numberOfThreads, int totalNumbersInSequence) {
		super();
		this.numberOfThreads = numberOfThreads;
		this.totalNumbersInSequence = totalNumbersInSequence;
	}
	
	public void printNumbers(int result) {
		synchronized (this) {
			while (number <= totalNumbersInSequence-1) {
				while (number % numberOfThreads != result) {
					try {
						wait();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
				
				System.out.println(Thread.currentThread().getName()+" "+number++);
				notifyAll();
			}
		}
	}
}

package com.kkjavatutorials.resource;

/**

* @author KK JavaTutorials

* NumbersGenerator is used by 2 threads to generate numbers in Sequence

public class NumbersGenerator {

private int number = 1;

private int numberOfThreads;

private int totalNumbersInSequence;

public NumbersGenerator(int numberOfThreads, int totalNumbersInSequence) {

super();

this.numberOfThreads = numberOfThreads;

this.totalNumbersInSequence = totalNumbersInSequence;

}

public void printNumbers(int result) {

synchronized (this) {

while (number <= totalNumbersInSequence-1) {

while (number % numberOfThreads != result) {

try {

wait();

} catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println(Thread.currentThread().getName()+" "+number++);

notifyAll();

}

Both threads call method numbersGenerator.printNumbers(result) to generate odd and even numbers in sequence

package com.kkjavatutorials.resource;

/**
* @author KK JavaTutorials
* Each thread call method printNumbers to generate numbers in sequence
*/
public class SequenceGeneratorTask implements Runnable {

private NumbersGenerator numbersGenerator;
private int result;

public SequenceGeneratorTask(NumbersGenerator numbersGenerator, int result) {
super();
this.numbersGenerator = numbersGenerator;
this.result = result;
}

@Override
public void run() {
numbersGenerator.printNumbers(result);
}

}

<span style="font-size: 14pt;"><strong>Client program SequenceNumberGeneratorTest.java</strong></span>

1	<span style="font-size: 14pt;"><strong>Client program SequenceNumberGeneratorTest.java</strong></span>

package com.kkjavatutorials.client;

import com.kkjavatutorials.resource.NumbersGenerator;
import com.kkjavatutorials.resource.SequenceGeneratorTask;

/**
* Java Program to print Even and Odd Numbers Using 2 Threads
* @author KK JavaTutorials
*
*/
public class SequenceNumberGeneratorTest {

private static final int TOTAL_NUMBER_IN_SEQUENCE = 20;
private static final int TOTAL_NUMBER_OF_THREADS = 2;

public static void main(String[] args) {

NumbersGenerator numbersGenerator = new NumbersGenerator(TOTAL_NUMBER_OF_THREADS, TOTAL_NUMBER_IN_SEQUENCE);

//Created three Threads
Thread t1 = new Thread(new SequenceGeneratorTask(numbersGenerator, 1), “Thread-1”);
Thread t2 = new Thread(new SequenceGeneratorTask(numbersGenerator, 0), “Thread-2”);

//Start all three threads
t1.start();
t2.start();

}
}

If you run client program SequenceNumberGeneratorTest.java then this will generate below output:

Thread-1 1
Thread-2 2
Thread-1 3
Thread-2 4
Thread-1 5
Thread-2 6
Thread-1 7
Thread-2 8
Thread-1 9
Thread-2 10
Thread-1 11
Thread-2 12
Thread-1 13
Thread-2 14
Thread-1 15
Thread-2 16
Thread-1 17
Thread-2 18
Thread-1 19
Thread-2 20

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