Question 2

Question 2

(a) Differentiate between boxing and unboxing.

Answer

Boxing is the conversion of primitive data type into an object of its corresponding wrapper class. Unboxing is the opposite of Boxing, it is the conversion of wrapper class object into its corresponding primitive data type. Below program highlights the difference between the two:

public class Boxing {
    public static void main(String args[]) {
        int a = 100, b;
        //Boxing
        Integer aWrapped = new Integer(a);
        //Unboxing
        b = aWrapped;
        System.out.println("Boxed Value: " + aWrapped);
        System.out.println("Unboxed Value: " + b);
    }
}

(b) Rewrite the following condition without using logical operators:

if ( a>b || a>c )
    System.out.println(a);

Answer

Condition without using logical operators:

if (a > b)
    System.out.println(a);
else if (a > c)
    System.out.println(a);

(c) Rewrite the following loop using for loop:

while (true)
System.out.print("*");

Answer

Loop rewritten using for:

for (;;)
    System.out.print("*");

(d) Write the prototype of a function search which takes two arguments a string and a character and returns an integer value.

Answer

Below is the function prototype required in the question:

int search(String str, char ch)

(e) Differentiate between = and == operators.

Answer