Binary operator

This lesson explores the Binary operator functional interface in Java.

We'll cover the following

BinaryOperator<T>

BinaryOperator<T> is a functional interface that inherits from BiFunction<T, T, T> interface. The BinaryOperator<T> interface takes only one parameter as compared to BiFunction<T, T, T>, which takes three parameters(two operands type and one result type).

Both the input objects and the result are of the same type in BinaryOperator<T>.

Below are the few interfaces that come under the BinaryOperator<T> category.
BinaryOperator<T> Represents an operation upon two operands of the same type, producing a result of the same type as the operands (reference type) T apply(T t, T u)
DoubleBinaryOperator Accepts two double-value operands and produces a double-value result double applyAsDouble(double left, double right)
IntBinaryOperator Accepts two int-value operands and produces an int-value result int applyAsInt(int left, int right)
LongBinaryOperator Accepts two long-value operands and produces a long-value result. applyAsLong(long left, long right)

Example

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import java.util.function.BinaryOperator;



public class BinaryOperatorDemo {





    public static void main(String args[]) {

        Person person1 = new Person("Alex", 23);

        Person person2 = new Person("Daniel", 56);

        BinaryOperator<Person> operator = (p1, p2) -> {

            p1.name = p2.name;

            p1.age = p2.age;

            return p1;

        };



        operator.apply(person1, person2);

        System.out.println("Person Name: " + person1.getName() + " Person Age: " + person1.getAge());

    }

}



class Person {

    String name;

    int age;



    Person() {

    }



    Person(String name, int age) {

        this.name = name;

        this.age = age;

    }



    public void setName(String name) {

        this.name = name;

    }



    public void setAge(int age) {

        this.age = age;

    }



    public String getName() {

        return name;

    }



    public int getAge() {

        return age;

    }

}
1

What is the purpose of the BooleanSupplier function interface? Choose all that apply.

A)

Represents a supplier of boolean-value results

B)

Returns boolean-value result

C)

There is no such function interface

D)

Returns null if boolean is passed as argument

Question 1 of 30 attempted

In the next lesson, we will discuss the capturing lambda expressions .

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