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

Interview Questions and Answers - Order By Rating

Q121. In the following code , how many methods needs to be implemented in Class B ?

public interface A{
   public void method1();
   public void method2();
   public void method3();
}

abstract class B implements A{
}

Core Java

Ans. As Class B has been declared abstract , we can either implement any of these methods and just declare rest of them abstract.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve interfaces abstract classes code coding}

Try 2 Question(s) Test

Related Questions

Differences between abstract class and interface ?

Difference between Abstract and Concrete Class ?

If an Abstract class has only abstract methods, What's the difference between such a class and an interface ?

What are the design considerations while making a choice between using interface and abstract class ?

How is Abstraction implemented in Java ?

Why can't we create an instance of abstract class ? Why is it restricted by compiler ?

Difference between Base Class, Derived Class , Abstract Class and Concrete Class ?

What is an abstract class ?

Shall we use abstract classes or Interfaces in Policy / Strategy Design Pattern ?

Will this code Work ? If not , Why ?

Q122. What will the following code print ?

Integer a = 100, b =100;
Integer c = 1000, d = 1000;
System.out.println(a == b);
System.out.println(c ==d);

Core Java

Ans. false
false

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve object equality code coding frequent}

Related Questions

Difference between == and .equals() ?

Why is null == null returns true ?

What is the difference between = and == in Java ?

How is == operator different for objects and primitive types ?

What will be the output of following code

Integer x = 1;
Integer y = 2;
System.out.println(x == y);

What if you change 1 to "1" and Integer to String?

How can we check equality for Arrays in Java ?

Q123. What will be the output of following code ?

public class BuggyBread {

   private int x;

   private BuggyBread(int x){
      x = x;
   };

   public static void main(String[] args){
      BuggyBread buggybread = new BuggyBread(5);
      System.out.println(buggybread.x);
   }
}

Core Java

a. compilation error

b. undefined

c. 0

d. 5

Ans.c. 0

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.