Java Stream How to - Double the value in a list with map and then output








Question

We would like to know how to double the value in a list with map and then output.

Answer

import java.util.Arrays;
import java.util.List;
public class Main {
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  public static void main(String[] args) {
    List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
    numbers.stream()
            .map(value -> value * 2)
            .forEach(System.out::println);

  }
}

The code above generates the following result.