Computer Applications

In what way does a class enforce data hiding?

Encapsulation & Inheritance in Java

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Answer

A class enforces data hiding through access specifiers. Java provides three access specifiers for its class members — public, private and protected. The private members of a class are only accessible within the class. They are hidden to the code outside the class. The protected members are accessible from classes within the same package and subclasses.

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A number is said to be Armstrong if the sum of cube of its digits is equal to the same number.
For example,
153 = 1³ + 5³ + 3³
Hence, 153 is an Armstrong number.
A program using a class is designed below to check and display whether a number 'num' is an Armstrong number or not. There are some places in the program left blank marked with ?1?, ?2?, ?3? and ?4? to be filled with suitable condition/expression.

class Armstrong { 
    private int num; 
    Armstrong(int n) {
         num = n; 
    boolean check( ) { 
        int nm = num; 
        while(...?1?...) {
            digit = nm % 10; 
            sum = sum + ...?2?... ;
            nm =  ...?3?... ;  
        }
        if (sum == num) 
            return(true); 
        else 
            return(false); 
    } 
    void display( ) {
        boolean ch = check( ); 
        if(ch == ...?4?... ) 
            System.out.println("Number is Armstrong"); 
        else 
            System.out.println("Number is not Armstrong"); 
    }
    }
 }

Based on the above discussion, answer the following questions:

(a) What will be filled in place of ?1?

(b) What will be filled in place of ?2?

(d) What will be filled in place of ?4?

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Computer Applications

In what way does a class enforce data hiding?

Encapsulation & Inheritance in Java

Answer

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