Question

JAVA MCQ QUESTION
WHAT IS THE ANSWER AND WHY

22. Consider the following code: public class C public int myVar; public void outerMethod) int myVar--1 Something x- new SomethingO public void myMethod O How do you write values to the instance variable myVar from inside myMethod? A. this.myVar - B. myVar. C. super.myVar D. C.this.myVar E. super ) .myVar

Answer 1

The Answer is A) this.myVar = ...

WHY ::..

Not B) because myVar in the sense it check's out the variable named myVar in the local scope , inside the outerMethod

Not C,E) The variable is this class only not in the super class , And also This class C is not a subclass of any super class

So C,E are incorrect and in spite of these The notation E is syntactically incorrect

Finally ::..

Actually the myVar belongs to the class C

So if we want to refer that variable from outside of the class then we refer it as C.myVar

but we are inside of the class , in a method ,

this -> is used to refers the present class

so out task is to refer the variable which is in the class, in which we are presently at

So the reference is this.myVar ; varaible names myVar in the present class means class in which the method is in

For better understanding about super class ;  

1.java 1 public class Superclass 2 public int myVar 1 0 5 // Here super class for class "subClass" is "superClass 6 public class SubClass extends SuperClass f 7 public void outerMethod) 1 super.myVar 1; public static main(String[] args) 0 5 SubClass obj -new SubClass (); obj.outerMethod) 12 13 14