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package tool;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
/**
*
* A simple Java Program to demonstrate how to use map and filter method Java 8.
* In this program, we'll convert a list of String into a list of Integer and
* then filter all even numbers.
*/
public class Hello {
   public static void main(String[] args) {
      List<String> numbers = Arrays.asList("1", "2", "3", "4", "5", "6");
      System.out.println("original list: " + numbers);
      List<Integer> even = numbers.stream()
                                        .map(s -> Integer.valueOf(s))
                                        .filter(number -> number % 2 == 0)
                                        .collect(Collectors.toList());
      System.out.println("processed list, only even numbers: " + even);
   }
}

Output
original list: [1, 2, 3, 4, 5, 6]
the processed list, only even numbers: [2, 4, 6]

souce: https://dzone.com/articles/how-to-use-map-filter-collect-of-stream-in-java-8