자바 ExecutorService3(Callable)

Callable로 해당 작업을 만들고 매개변수로 호출하는 형식.

 

package main.java.com;

import java.util.concurrent.*;

public class ExecutorServiceMain3 {
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        System.out.println("start");
        ExecutorService executorService = Executors.newCachedThreadPool();

        Callable<Integer> task = new Callable<Integer>() {
            @Override
            public Integer call() throws Exception {
                int sum = 0;

                for(int i = 0; i < 10; i++) {
                    sum += i;
                }

                return sum;
            }
        };

        Future<Integer> future = executorService.submit(task);
        int sum = future.get();
        System.out.println(sum);
        System.out.println("end");
    }
}