80. What is the difference between method overloading and method overriding in Java?
Ans: Refer to this tutorial: Top 10 Difference between Overloading and Overriding in Java
81. What is Method hiding in Java?
Ans: If a static method defined in the parent class is redefined in a child class, the child class’s method hides the method defined in the parent class. This mechanism is called method hiding in Java or function hiding.
82. What is the output of the following code?
public class X {
protected static void m1(int a) {
System.out.println("m1-X");
}
}
public class Y extends X
{
static void m1(int y) {
System.out.println("m1-Y");
}
}
public class MyTest {
public static void main(String[] args) {
X x = new Y();
x.m1(10);
Y y = new Y();
y.m1(20);
}
}Ans: Output: m1-X, Compile-time error because we cannot reduce the visibility of the inherited method from X.
83. What is the difference between method hiding and method overriding?
Ans: The difference between method hiding and method overriding is as follows:
a. In method hiding, both parent and child class methods should be static whereas, in overriding, both parent and child class methods should be non-static.
b. Compiler is responsible for method resolution based on reference type whereas, in method overriding, JVM is always responsible for method resolution based on runtime object.
c. Method hiding is also known as compile-time polymorphism whereas, method overriding is also known as runtime polymorphism.
84. What is dynamic method dispatch in Java?
Ans: Dynamic method dispatch is a technique in which object refers to superclass but at runtime, the object is constructed for subclass.
85. Why is dynamic method dispatch important in Java?
Ans: Dynamic dispatch method is important because it is a process through which Java implements runtime polymorphism.
For practice coding based on dynamic method dispatch, go to this tutorial: Dynamic method dispatch in Java.
For more programming Interview Questions on OOPs concepts, follow the below links:
- 40 Java Abstract Class Interview Questions and Answers
- 50 Java Interface Programming Questions with Answers
- 32 Interview Questions based on Polymorphism
Hope that these OOPs interview questions in Java will help you to understand the level of questions asked by the interviewer. These are general OOPs interview questions that should be prepared by those who want to crack technical tests and interviews. New Questions will be regularly updated. Please, share it on social networking sites for your friends.
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