gistfile1.txt

package com.concretepage.util.concurrent;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
public class CompletableFutureOneExample {
    public static void main(String[] args) throws InterruptedException {
        List<Integer> list = Arrays.asList(10,20,30,40);
        list.stream().map(data->CompletableFuture.supplyAsync(()->getNumber(data))).
                map(compFuture->compFuture.thenApply(n->n*n)).map(t->t.join())
                .forEach(s->System.out.println(s));
    }
    private static int getNumber(int a){
        return a*a;
    }
}