Question

in bluej java Write an application with two classes. Class NumberUtility has one instance variable n of type int. Constructor initializes instance variable n by using input parameter n.

• public NumberUtility(int n)

Class also has the following methods:  

• public int getN()                              // Returns instance variable n

• public boolean isOdd()                  // Returns true if number n is odd and returns false otherwise.
• public boolean isEven()               // Returns true if number n is even and returns false if it is odd.

     // Implement method by invoking method isOdd.

• public int countDigits(int givenDigit)    // Returns count how many digits from  n are equal to givenDigit.

                   // Parameter givenDigit should be single digit number with value

                   //  between 0 and 9 including the limits.                                                     

• public int countEven()                   // Returns count how many digits are even in number n.
• public void report()                        // Method report invokes the above  methods and reports results

     // by using full sentence for each invoked method.

Class TestUtility has main method with variable obj of NumberUtility type.  User should be repeatedly asked to provide (via keyboard) an input number or 0 to stop.  A new object from NumberUtility class should be instantiated and used to reassign the variable obj for each nonzero number entered by user.  Object obj should invoke method report().   Must use while loop to implement iteration (or repetition).

Answer 1

import java.util.*;  

//Ceating Class
class NumberUtility{
        //Creating Variable
        public int n;
        
        //Initialising Variable Through Constructor
        public NumberUtility(int n){
            this.n = n;
        }
        
        //Getting The Value Entered
        public int getN(){
            return n; 
        }        
        
        //Checking the number is Odd or not
        public boolean isOdd(){
            if( n % 2 != 0 ){
                return true;
            }
            return false;
        }        
        
        //Checking the number is Even or not
        public boolean isEven(){
            if( n % 2 == 0 ){
                return true;
            }
            return false;
        } 
        //Count The Digits of the number
        public int countDigits(int givenDigit){
            int count = 0; 
            while(givenDigit != 0)
            {
                givenDigit /= 10;
                ++count;
            }
            return count;
        }
        //Count the Even Digits in Number
        public int countEven(){
            int even_count = 0;
            while(n > 0)  
            { 
                int rem = n % 10; 
                if (rem % 2 == 0) 
                    even_count++; 
                n = n / 10; 
            }
            return even_count;
        }
        
        //Printing All The Result
        public void report(){
            System.out.println("Number Entered: " + getN());
            if( isEven() ) {
                System.out.println("No is Even");   
            }
            if( isOdd() ) {
                System.out.println("No is Odd");   
            }
            System.out.println("Number Of Digits In Entered Number: " + countDigits(n));
            System.out.println("Number Of Even Digits In Entered Number: " + countEven());
        }
    }


public class Main
{
    
        public static void main(String[] args) {
            while(true){ //Infnite Loop Will Exit When User Will Enter 0
                System.out.println("Enter Any No (0 to Exit): ");
                Scanner sc=new Scanner(System.in);  
                int n = sc.nextInt(); //Getting The Input
                if( n == 0 ){
                    break; //If No Entered is Zero Then Loop Will break
                }
                //Initiliaze The Object
                NumberUtility a = new NumberUtility(n);
                a.report(); //Calling The Report Function 
            }
        }
}

Output: