In this post, we will learn How to write a java program to Print numbers in sequence using 3 Threads.
Numbers have to print in below order by all 3 Threads::
Thread-1 Thread-2 Thread-3
1 2 3
4 5 6
7 8 9
10 11 12
————————————–
NumbersGenerator.java is used by all three threads to generate numbers in Sequence
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package com.kkjavatutorials.resource; /** * * @author KK JavaTutorials * NumbersGenerator is used by all three 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(); } } } } |
Each thread call method numbersGenerator.printNumbers(result) to generate numbers in sequence
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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); } } |
Client program SequenceNumberGeneratorTest.java
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package com.kkjavatutorials.client; import com.kkjavatutorials.resource.NumbersGenerator; import com.kkjavatutorials.resource.SequenceGeneratorTask; /** * Java program to Print numbers in sequence using 3 Threads * @author KK JavaTutorials * */ public class SequenceNumberGeneratorTest { private static final int TOTAL_NUMBER_IN_SEQUENCE = 10; private static final int TOTAL_NUMBER_OF_THREADS = 3; 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, 2), "Thread-2"); Thread t3 = new Thread(new SequenceGeneratorTask(numbersGenerator, 0), "Thread-3"); //Start all three threads t1.start(); t2.start(); t3.start(); } } |
If you run client program SequenceNumberGeneratorTest.java then this will generate below output:
Thread-1 1
Thread-2 2
Thread-3 3
Thread-1 4
Thread-2 5
Thread-3 6
Thread-1 7
Thread-2 8
Thread-3 9
Thread-1 10
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That’s all about Java program to Print numbers in sequence using 3 Threads?
If you have any feedback or suggestion please feel free to drop in below comment box.
Hii kishan,
Query re: Java program to Print numbers in sequence using 3 Threads
I’ve used the same code to print 40 numbers using 5 threads, but threads are printing the numbers greater than total numbers to be printed.
pls find the below output.
Thread-1—1
Thread-2—2
Thread-3—3
Thread-4—4
Thread-5—5
Thread-1—6
Thread-2—7
Thread-3—8
Thread-4—9
Thread-5—10
Thread-1—11
Thread-2—12
Thread-3—13
Thread-4—14
Thread-5—15
Thread-1—16
Thread-2—17
Thread-3—18
Thread-4—19
Thread-5—20
Thread-1—21
Thread-2—22
Thread-3—23
Thread-4—24
Thread-5—25
Thread-1—26
Thread-2—27
Thread-3—28
Thread-4—29
Thread-5—30
Thread-1—31
Thread-2—32
Thread-3—33
Thread-4—34
Thread-5—35
Thread-1—36
Thread-2—37
Thread-3—38
Thread-4—39
Thread-5—40
Thread-1—41
Thread-2—42
It would be great if you let me know where to alter the code
Replace
while (number < totalNumbersInSequence-1)
with
while (number < totalNumbersInSequence – numOfThreads +1)
The reason is when the threads will come to runnable state from wait state, the last part [below lines of wait() call] of printNumbers() method would be executed.