READING USER INPUT 

package com.cnc;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter your year of birth : ");

        boolean hasNextInt = scanner.hasNext();

        if(hasNextInt) {
            int yearOfBirth = scanner.nextInt();
            scanner.nextLine(); // when you not press the enter key the
                                // machine thinks the enter key as
                                // the input for the name and
                                // missed the chance .So to overcome get a
                                // chance  scanner.nextLine(); is used


            System.out.println("Enter your Name: ");
            String name = scanner.nextLine();
            int age = 2020 - yearOfBirth;

            if (age >= 0 && age <= 100) {
                System.out.println("Your nam is " + name + ", you are " + age + " year old.");
            } else {
                System.out.println("Invalid Year of birth");
            }

        }else System.out.println("Unable to parse year of birth");

        scanner.close();
    }
}

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