In this tutorial, we will see “What is a maxBy() method in Java 8 and how we can use it?” maxBy java 8
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Collectors maxBy() Method
Syntax & Description
Returns a Collector that produces the maximal element according to a given Comparator, described as an Optional<T>.
Syntax: static <T> Collector<T,?,Optional<T>> maxBy(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 maximal 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 maxBy method as name suggest, Find the person with the max age * @author Deepak Verma * */ import java.util.Arrays; import java.util.Comparator; import java.util.List; import java.util.stream.Collectors; public class maxBy_Collectors_Method_Java8_Example { public static void main(String args[]) { List<Person> people = Arrays.asList( new Person("Yashika", 17), new Person("Deepak", 37), new Person("Yash", 17), new Person("Isha", 32), new Person("Gaurangee", 21) ); Person oldestPerson = people.stream() .collect(Collectors.maxBy(Comparator.comparing(Person::getAge))) .orElse(null); System.out.println("Older Person among the list is: "+oldestPerson.getName()); } } |
Output:
1 | Older Person among the list is: Deepak |
maxBy java 8
In this example, we have a list of Person objects and we want to find the oldest person in the list. We use the maxBy method with a Comparator that compares the ages of the persons and returns the person with the highest age. The maxBy 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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