In this tutorial, we will see “What is a minBy() method in Java 8 and how we can use it?” minBy java 8
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Collectors minBy() Method
Syntax & Description
Returns a Collector that produces the minimal element according to a given Comparator, described as an Optional<T>.
Syntax: static <T> Collector<T,?,Optional<T>> minBy(Comparator<? super T> comparator)
Type Parameters:
<T> the type of the input elements
Parameters:
comparator a Comparator for comparing elements
Returns:
a Collector that produces the minimal value
How to use it – an Example?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | /** * Using minBy method as name suggest, Find the person with the min age * @author Deepak Verma * */ import java.util.Arrays; import java.util.Comparator; import java.util.List; import java.util.stream.Collectors; public class minBy_Collectors_Method_Java8_Example { public static void main(String args[]) { List<Person> people = Arrays.asList( new Person("Yashika", 15), new Person("Deepak", 37), new Person("Yash", 17), new Person("Isha", 32), new Person("Gaurangee", 21) ); Person youngestPerson = people.stream() .collect(Collectors.minBy(Comparator.comparing(Person::getAge))) .orElse(null); System.out.println("Youngest Person among the list is: "+youngestPerson.getName()); } } |
Output:
1 | Youngest Person among the list is: Yashika |
minBy java 8
In this example, we have a list of Person objects and we want to find the youngest person in the list. We use the minBy method with a Comparator that compares the ages of the persons and returns the person with the lowest age. The minBy method returns an Optional object, so we use the orElse method to get the actual person object or null if the list is empty.
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