In this source code example, we show how to use Java 8 Collectors.minBy() and Collectors.maxBy() methods with an example.

Java 8 Collectors.minBy() and Collectors.maxBy() example

  import java.util.List; import java.util.Optional; import java.util.stream.Collectors; public class JavaCollectMinMaxEx { public static void main(String[] args) { var vals = List.of(1, 2, 3, 4, 5, 6, 7); // can be replaced with min() Optional min = vals.stream().collect(Collectors.minBy(Integer::compareTo)); // can be replaced with max() Optional max = vals.stream().collect(Collectors.maxBy(Integer::compareTo)); min.ifPresent(val -> System.out.printf("Minimum is %d%n", val)); max.ifPresent(val -> System.out.printf("Maximum is %d%n", val)); } }  

Output:

 Minimum is 1 Maximum is 7