Core Java - Interview Questions and Answers for 'Return type' | Search Java Interview Question

Core Java - Interview Questions and Answers for 'Return type' - 4 question(s) found - Order By Newest

Q1. what is covariant return type?

^{Admin
info@buggybread.com}

Ans. co-variant return type states that return type of overriding method can be subtype of the return type declared in method of superclass. it has been introduced since jdk 1.5

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Q2. What is void in Java ?

Core Java

^{2017-05-13 19:58:10}

Ans. void is a return type which indicates that the method returns nothing but returns the control to the line next to the method call. All methods need to have a return type and hence a method returning nothing needs to be declared void.

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Q3. Does all methods need to have a return type ? Is it applicable to constructors too ?

Core Java

^{2017-05-13 19:59:44}

Ans. All methods are not expected to return something but Yes, all methods are expected to have a return type. If a method returns nothing, it can be declared with the return type void.

Constructors are not expected to have any return types , not even void.

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Q4. What is the difference between the 2 methods in Java ?

Class BuggyBread {

BuggyBread(){
}
void BuggyBread(){
}
}

Core Java

^{2017-05-13 20:02:27}

Ans. BuggyBread method without any return type is the constructor which get's called upon object creation whereas BuggyBread method with return type of void is just another method that needs to be called explicitly for it's invocation.

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