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Java program to illustrate Callable and FutureTask for random number generation

Anjali Sharma answered on January 3, 2023 Popularity 1/10 Helpfulness 1/10

answer Java program to illustrate Callable and FutureTask for random number generation

Java program to illustrate Callable and FutureTask for random number generation

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// Java program to illustrate Callable and FutureTask
// for random number generation
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
  
class CallableExample implements Callable
{
  
  public Object call() throws Exception
  {
    Random generator = new Random();
    Integer randomNumber = generator.nextInt(5);
  
    Thread.sleep(randomNumber * 1000);
  
    return randomNumber;
  }
  
}
  
public class CallableFutureTest
{
  public static void main(String[] args) throws Exception
  {
  
    // FutureTask is a concrete class that
    // implements both Runnable and Future
    FutureTask[] randomNumberTasks = new FutureTask[5];
  
    for (int i = 0; i < 5; i++)
    {
      Callable callable = new CallableExample();
  
      // Create the FutureTask with Callable
      randomNumberTasks[i] = new FutureTask(callable);
  
      // As it implements Runnable, create Thread
      // with FutureTask
      Thread t = new Thread(randomNumberTasks[i]);
      t.start();
    }
  
    for (int i = 0; i < 5; i++)
    {
      // As it implements Future, we can call get()
      System.out.println(randomNumberTasks[i].get());
  
      // This method blocks till the result is obtained
      // The get method can throw checked exceptions
      // like when it is interrupted. This is the reason
      // for adding the throws clause to main
    }
  }
}

Popularity 1/10 Helpfulness 1/10 Language java

Source: www.geeksforgeeks.org

Tags: callable futuretask java random

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Contributed on Jan 03 2023

Anjali Sharma

0 Answers Avg Quality 2/10

Java program to illustrate Callable and FutureTask for random number generation

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