ex1.java

import java.util.Arrays;
import java.util.stream.Collectors;

public class ex1 {
    public static void main(String args[]) {
		// var a = Arrays.asList(1, 2, 3, 5);
		var a = Arrays.asList(args)
			.stream()
			.map(i -> Integer.parseInt(i))
			.collect(Collectors.toList());

		var result = a.stream().map(i -> i * 2);

		System.out.println(
			result.map(i -> i.toString())
				.collect(Collectors.joining(", ", "[", "]")));
    }
}