What is Thread Pool? How can we create Thread Pool in Java?

Deepika Sahu answered on October 12, 2022 Popularity 9/10 Helpfulness 1/10

answer What is Thread Pool? How can we create Thread Pool in Java?

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What is Thread Pool? How can we create Thread Pool in Java?

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A thread pool manages the pool of threads, it contains a queue that keeps tasks waiting to get executed.
    java.util.concurrent.Executors provide implementation of java.util.concurrent.
    Executor interface to create the thread pool in java.

Popularity 9/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java pool

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Contributed on Dec 15 2022

Deepika Sahu

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// Java program to illustrate  
// ThreadPool 

// STEPS:
// 1. Create a task(Runnable Object) to execute
// 2. Create Executor Pool using Executors
// 3. Pass tasks to Executor Pool
// 4. Shutdown the Executor Pool

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();     
    } 
}

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Source: www.geeksforgeeks.org

Tags: java

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Contributed on Oct 12 2022

Mustafa Sadir

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What is Thread Pool? How can we create Thread Pool in Java?

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