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Declarations and Access Control

Q1:

What will be the output of the program? 
class Super
{ 
    public int i = 0; 

    public Super(String text) /* Line 4 */
    {
        i = 1; 
    } 
} 

class Sub extends Super
{
    public Sub(String text)
    {
        i = 2; 
    } 

    public static void main(String args[])
    {
        Sub sub = new Sub('Hello'); 
        System.out.println(sub.i); 
    } 
}

A 0

B 1

C 2

D Compilation fails.

ANS:A - 0

A default no-args constructor is not created because there is a constructor supplied that has an argument, line 4. Therefore the sub-class constructor must explicitly make a call to the super class constructor: 

public Sub(String text)
{ 
    super(text); // this must be the first line constructor 
    i = 2; 
}



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