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Thread Pools in Java

DarkDevilor answered on November 10, 2022 Popularity 6/10 Helpfulness 3/10

answer Thread Pools in Java

Thread Pools in Java

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// Java program to illustrate 
// ThreadPool
import java.text.SimpleDateFormat; 
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
  
// Task class to be executed (Step 1)
class Task implements Runnable   
{
    private String name;
      
    public Task(String s)
    {
        name = s;
    }
      
    // Prints task name and sleeps for 1s
    // This Whole process is repeated 5 times
    public void run()
    {
        try
        {
            for (int i = 0; i<=5; i++)
            {
                if (i==0)
                {
                    Date d = new Date();
                    SimpleDateFormat ft = new SimpleDateFormat("hh:mm:ss");
                    System.out.println("Initialization Time for"
                            + " task name - "+ name +" = " +ft.format(d));   
                    //prints the initialization time for every task 
                }
                else
                {
                    Date d = new Date();
                    SimpleDateFormat ft = new SimpleDateFormat("hh:mm:ss");
                    System.out.println("Executing Time for task name - "+
                            name +" = " +ft.format(d));   
                    // prints the execution time for every task 
                }
                Thread.sleep(1000);
            }
            System.out.println(name+" complete");
        }
          
        catch(InterruptedException e)
        {
            e.printStackTrace();
        }
    }
}
public class Test
{
     // Maximum number of threads in thread pool
    static final int MAX_T = 3;             
  
    public static void main(String[] args)
    {
        // creates five tasks
        Runnable r1 = new Task("task 1");
        Runnable r2 = new Task("task 2");
        Runnable r3 = new Task("task 3");
        Runnable r4 = new Task("task 4");
        Runnable r5 = new Task("task 5");      
          
        // creates a thread pool with MAX_T no. of 
        // threads as the fixed pool size(Step 2)
        ExecutorService pool = Executors.newFixedThreadPool(MAX_T);  
         
        // passes the Task objects to the pool to execute (Step 3)
        pool.execute(r1);
        pool.execute(r2);
        pool.execute(r3);
        pool.execute(r4);
        pool.execute(r5); 
          
        // pool shutdown ( Step 4)
        pool.shutdown();    
    }
}

Popularity 6/10 Helpfulness 3/10 Language java

Source: www.geeksforgeeks.org

Tags: java

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Contributed on Nov 10 2022

DarkDevilor

0 Answers Avg Quality 2/10

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