Question

Write an interface and two classes which will implements the interface.

1. Interface - StringVerification

- will have the abstract method defined - boolean verifyInput( String input );

2. class EmailVerification implements StringVerification

- implement the verifyInput() method in EmailVerification class. The method should validate a user input String, character by character and see the input string has a dot (.) and an at the rate (@) character in it. If any of the condition wrong the verifyInput method will return a false boolean value.

Example of a valid Email id – [email protected]

3. class PhoneVerification implements StringVerification

- implement the verifyInput() method in PhoneVerification class. The method should validate user input String, character by character and see, the input string is all digits and the phone number has exactly 10 digits. If any of the condition wrong, the verifyInput() method will return a false boolean value.

Example of a valid phone number – 5161112222

4. The client (Main) class

The client class should prompt for 2 entry from the console when running, as below.

System.out.print( "Enter the string to verify: " );

String input = scan.nextLine( );

System.out.println( "\nOur options are: "

+ "\n\t1 Email ID Verification"

+ "\n\t2 Phone number Verification");

System.out.print( "Select your verification option 1 or 2: " );

int option = scan.nextInt( );

Based on the screen input option (1 or 2), the appropriate class (EmailVerification or PhoneVerification) is instantiated and assign it to the object reference of – StringVerification.

For option 1, Email id string entered is verified using the EmailVerification classes verifyInput() method and an appropriate message is displayed, if it is a valid Email ID.

For option 2, Phone number string entered is verified using the PhoneVerification classes verifyInput() method and an appropriate message is displayed, if it is a valid Phone number.

Answer 1

//note if you hav e any quires comment it i will explian

import java.util.Scanner;

interface stringvrification{
   boolean vreifyinput(String input);
}
class emailverification implements stringvrification{

   @Override
   public boolean vreifyinput(String input) {
       boolean correct=false,correct1=false;
       for(int i=0;i<input.length();i++) {
           if(input.charAt(i)=='@') {
               correct=true;
           }
           if(input.charAt(i)=='.') {
               correct1=true;
           }
       }
       if(correct&&correct1){
           return true;
       }
       else {
           return false;
       }
   }
  
}

class phonenumberverification implements stringvrification{

   @Override
   public boolean vreifyinput(String input) {
       char[] chars= input.toCharArray();
       if(input.length()!=10)
       {
       return false;
       }
       else {
           for(char c : chars){
       if(Character.isDigit(c)){
         
       }
       else {
           return false;
       }
       }
       }
       return true;
   }
  
}
public class main{
   public static void main(String[]args) {
       System.out.println("select your verification option ");
       System.out.println("for email verification press 1 ");
       System.out.println("for phonenumber verification press 2");
       System.out.println("enter your choice");
       Scanner sc =new Scanner (System.in);
       int choice=sc.nextInt();
       System.out.println("enter the string");
       String input=sc.nextLine();
       if(choice==1) {
       emailverification email =new emailverification();
       if(email.vreifyinput(input)) {
           System.out.println("valid email");
       }
       else {
           System.out.println("not valid email");
       }
       }
       if(choice==2) {
       phonenumberverification phonenumber= new phonenumberverification();
   if(   phonenumber.vreifyinput(input)) {
       System.out.println("valid phone number");
   }
   else {
       System.out.println("invalid phone number");
   }
       }
      
   }

}