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Java Tutorial: Java Threads (Thread pool in java | Java thread pool | Java thread pool tutorial_V5)

PrintCharTask.java

class PrintCharTask implements Runnable
{
    private char character;
    private int noOfTimes;

    PrintCharTask(char ch, int n)
    {
        character = ch;
        noOfTimes = n;
    }

    public void run()
    {
        for (int i = 0; i < noOfTimes; i++)
        {
            System.out.println(character + " ");
        }
    }
}

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

class Threadpool
{
    public static void main(String[] args)
    {
        System.out.println("Main Thread starts");
        ExecutorService threadExecutor = Executors.newFixedThreadPool(2);
        
        PrintCharTask taskl = new PrintCharTask('*', 5);
        PrintCharTask task2 = new PrintCharTask('S', 5);
        PrintCharTask task3 = new PrintCharTask('M', 5);
        PrintCharTask task4 = new PrintCharTask('N', 5);
        
        threadExecutor.execute(taskl);
        threadExecutor.execute(task2);
        threadExecutor.execute(task3);
        threadExecutor.execute(task4);
        /*
         * Tells the threadExecutor to shutdown. No new task
         * can be accepted but the existing task will
         * continue to finish.
         */
        threadExecutor.shutdown();
        /*
         * In order to ensure that the main thread finishes
         * last i.e. all tasks are finished before the main
         * thread terminates, we put the below while
         * statement.
         */
        while (!threadExecutor.isTerminated())
        {
        }
        System.out.println("\nMain Thread Ends");
    }
}