Java - Exception implements Callable

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Description

implements Callable

Demo

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class MainExecutors2 {
  public static void main(String[] args) throws InterruptedException, ExecutionException {
    // Inner Class For Creating Threads
    class SumInteger implements Callable<Integer> {
      int maxValue = 0;

      public SumInteger(int maxValue) {
        this.maxValue = maxValue;
      }/* www .j  a  v  a 2s . c o  m*/

      @Override
      public Integer call() throws Exception {
        // TODO Auto-generated method stub
        int sum = 0;
        for (int i = 0; i < maxValue; i++) {
          sum += i;
        }
        return sum;
      }

    }
    class SquareInteger implements Callable<Double> {
      double value = 0;

      public SquareInteger(double value) {
        this.value = value;
      }

      @Override
      public Double call() throws Exception {
        // TODO Auto-generated method stub
        return value * value;
      }

    }
    // Normal Code to execute task using Executor
    ExecutorService executorService = Executors.newFixedThreadPool(2);
    Future<Integer> futureSum = executorService.submit(new SumInteger(4));
    Future<Double> futureSquare = executorService.submit(new SquareInteger(2.2f));
    System.out.println("Sum:" + futureSum.get());
    System.out.println("Square:" + futureSquare.get());
    executorService.shutdown();
  }

}

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