Question

USING JAVA

A little-known fact: According to Pets.WebMD website: For dogs under 21 pounds in weight, the conversion from a dog’s age to an equivalent human age is:
1st year: 15 years
2nd year: add 9 years
thereafter: add 4 years for each additional year of the dog’s age
So, for example, a dog aged 5 would have an equivalent age of (15+9+4+4+4), or 36 human years old.   

Write a lambda expression called convertToHuman, using a standard functional interface, that will take a given dog and return the equivalent human age . [Assume dog weighs less than 21 pounds]

Answer 1

If you have any problem with the code feel free to comment.

Program

import java.util.Scanner;

//funtional interface
interface DogToHuman{
        public int convertToHuman(int dog);
}

public class Test{
        public static void main(String[] args) {
                //creating a labda expression
                DogToHuman obj = (int dog) -> {
                        int age = 0;
                        //calcualting the age  of human in dog years
                        for(int i=1; i<=dog; i++) {
                                if(i==1)
                                        age +=15;
                                else if(i==2)
                                        age += 9;
                                else
                                        age += 4;
                        }
                        return age;
                };
                
                Scanner sc = new Scanner(System.in);
                //taking user input
                System.out.print("Enter dogs age: ");
                int dog = sc.nextInt();
                sc.close();
                //displaying output
                System.out.println("Human age: "+obj.convertToHuman(dog)+" years");
        }
}

Output