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How to use BinaryOperator interface in lambda expression in Java?
BinaryOperator<T> is one of a functional interface from java.util.function package and having exactly one abstract method. A lambda expression or method reference uses BinaryOperator objects as their target. BinaryOperator<T> interface represents a function that takes one argument of type T and returns a value of the same type.
BinaryOperator<T> Interface contains two static methods, minBy() and maxBy(). The minBy() method returns a BinaryOperator that returns the greater of two elements according to a specified Comparator while the maxBy() method returns a BinaryOperator that returns the lesser of two elements according to a specified Comparator.
Syntax
@FunctionalInterface public interface BinaryOperator<T> extends BiFunction<T, T, T>
Example
import java.util.function.BinaryOperator;
public class BinaryOperatorTest {
public static void main(String[] args) {
BinaryOperator<Person> getMax = BinaryOperator.maxBy((Person p1, Person p2) -> p1.age-p2.age);
Person person1 = new Person("Adithya", 23);
Person person2 = new Person("Jai", 29);
Person maxPerson = getMax.apply(person1, person2);
System.out.println("Person with higher age :
"+ maxPerson);
BinaryOperator<Person> getMin = BinaryOperator.minBy((Person p1, Person p2) -> p1.age-p2.age);
Person minPerson = getMin.apply(person1, person2);
System.out.println("Person with lower age :
"+ minPerson);
}
}
// Person class
class Person {
public String name;
public Integer age;
public Person(String name, Integer age) {
this.name = name;
this.age = age;
}
@Override
public String toString(){
return "Name : "+name+", Age : "+age;
}
}Output
Person with higher age : Name : Jai, Age : 29 Person with lower age : Name : Adithya, Age : 23
Updated on: 13-Jul-2020
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