- In this post, we will learn How to write a Java program to Print numbers in sequence using 2 Threads & Executor Framework
- In the previous posts, we already had seen How to Print numbers in sequence using 2 Threads(Approach-1) and Print numbers in sequence using 2 Threads(Approach-2)
- In this post, I have used the same problem statement and solved using Executor Framework.
OddAndEvenNumberGenerator.java is used by both the threads to print odd and even numbers
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package com.kkjavatutorials.task; public class OddAndEvenNumberGenerator { private int totalNumberInSequece; private boolean evenFlag; private int number = 1; public OddAndEvenNumberGenerator(int totalNumberInSequece) { super(); this.totalNumberInSequece = totalNumberInSequece; } public void printOddNumber() { synchronized (this) { while (number <= totalNumberInSequece-1) { while (evenFlag) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println(Thread.currentThread().getName()+": "+number); number++; evenFlag = true; notify(); } } } public void printEvenNumber() { synchronized (this) { while (number <= totalNumberInSequece-1) { while (!evenFlag) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println(Thread.currentThread().getName()+": "+number); number++; evenFlag = false; notify(); } } } } |
OddNumberPrinter.java calls printOddNumber() method to print odd numbers
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package com.kkjavatutorials.task; public class OddNumberPrinter implements Runnable { private OddAndEvenNumberGenerator oddAndEvenBumberGenerator; public OddNumberPrinter(OddAndEvenNumberGenerator oddAndEvenBumberGenerator) { super(); this.oddAndEvenBumberGenerator = oddAndEvenBumberGenerator; } @Override public void run() { oddAndEvenBumberGenerator.printOddNumber(); } } |
EvenNumberPrinter.java calls printEvenNumber() method to print even numbers
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package com.kkjavatutorials.task; public class EvenNumberPrinter implements Runnable { private OddAndEvenNumberGenerator oddAndEvenBumberGenerator; public EvenNumberPrinter(OddAndEvenNumberGenerator oddAndEvenBumberGenerator) { super(); this.oddAndEvenBumberGenerator = oddAndEvenBumberGenerator; } @Override public void run() { oddAndEvenBumberGenerator.printEvenNumber(); } } |
Client program SequenceNumberGeneratorTest.java which using Executor Framework
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package com.kkjavatutorials.client; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import com.kkjavatutorials.task.EvenNumberPrinter; import com.kkjavatutorials.task.OddAndEvenNumberGenerator; import com.kkjavatutorials.task.OddNumberPrinter; /** * Java program to Print numbers in sequence using 2 Threads & Executor Framework * @author KK JavaTutorials * */ public class SequenceNumberGeneratorTest { private static final int TOTAL_NUMBER_IN_SEQUENCE = 20; public static void main(String[] args) { OddAndEvenNumberGenerator oddAndEvenNumberGenerator = new OddAndEvenNumberGenerator(TOTAL_NUMBER_IN_SEQUENCE); ExecutorService executorService = null; try { executorService = Executors.newFixedThreadPool(2); executorService.execute(new OddNumberPrinter(oddAndEvenNumberGenerator)); executorService.execute(new EvenNumberPrinter(oddAndEvenNumberGenerator)); } catch (Exception e) { e.printStackTrace(); }finally { if(executorService != null) executorService.shutdown(); } } } |
If you run client program SequenceNumberGeneratorTest.java then this will generate below output:
pool-1-thread-1: 1
pool-1-thread-2: 2
pool-1-thread-1: 3
pool-1-thread-2: 4
pool-1-thread-1: 5
pool-1-thread-2: 6
pool-1-thread-1: 7
pool-1-thread-2: 8
pool-1-thread-1: 9
pool-1-thread-2: 10
pool-1-thread-1: 11
pool-1-thread-2: 12
pool-1-thread-1: 13
pool-1-thread-2: 14
pool-1-thread-1: 15
pool-1-thread-2: 16
pool-1-thread-1: 17
pool-1-thread-2: 18
pool-1-thread-1: 19
pool-1-thread-2: 20
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That’s all about Java program to Print numbers in sequence using 2 Threads & Executor Framework
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