How do I create four abstract methods that return no values? This is in Java and we have been using IntelliJ. We have already covered this but I can't find it in my notes or the slides, so I just need some help filling in the blanks

java follow the directons on the photo, don't use others answers, screenshot of output Thank you!!!

A Java program has been started for you. The goal of the program is to prompt the user to enter a credit card number and then display whether the card is valid/invalid. Several method headers have already been defined in the code. Your task is to complete the body of each of these methods (6 in total) so that the program accomplishes the stated goal above.   Below I have started the code for you as practice and I even included hints as comments to help you out.    import java.util.Scanner; public class CreditCard {public static void main(String[] args) {Scanner input = new Scanner(System.in);System.out.print("Enter a credit card number: ");long number = input.nextLong(); if (isValid(number))System.out.println("valid");elseSystem.out.println("invalid");} /** Return true if the card number is validWhat makes a card number valid?1. 13-16 digits2. Prefix of 4, 5, 6, or 373. Result of Luhn check must be divisible by 10*/public static boolean isValid(long number) {// Enter your code here}…

Why is it not possible to implement the multiple inheritance in Java? How do you solve that problem? Give at least one example that describes a way to implement the multiple inheritance using an interface.