Java interview questions part 13
Java interview questions part 13
Take as many assements as you can to improve your validate your skill rating
Total Questions: 20
1. When does method overloading is determined?
Correct Answer is : At compile time
2. When Overloading does not occur?
Correct Answer is : More than one method with same name, same number of parameters and type but different signature
3. Which concept of Java is a way of converting real world objects in terms of class?
Correct Answer is : Abstraction
4. Which concept of Java is achieved by combining methods and attribute into a class?
Correct Answer is : Encapsulation
5. What is it called if an object has its own lifecycle and there is no owner?
Correct Answer is : Association
6. What is it called where child object gets killed if parent object is killed?
Correct Answer is : Composition
7. What is it called where object has its own lifecycle and child object cannot belong to another parent object?
Correct Answer is : Aggregation
8. Method overriding is combination of inheritance and polymorphism?
Correct Answer is : TRUE
9. What is true about private constructor?
Correct Answer is : Private constructor ensures only one instance of a class exist at any point of time
10. What would be the behaviour if this() and super() used in a method?
Correct Answer is : compile time error
11. What is false about constructor?
Correct Answer is : Constructor can be overloaded
12. What is true about Class.getInstance()?
Correct Answer is : Class.getInstance creates object if class does not have any constructor
13. What is true about constructor?
Correct Answer is : It can take any number of parameters
14. Abstract class cannot have a constructor.
Correct Answer is : FALSE
15. What is true about protected constructor?
Correct Answer is : Protected constructor can only be called using super()
16. What is not the use of “this” keyword in Java?
Correct Answer is : Passing itself to method of the same class
17. What would be the behaviour if one parameterized constructor is explicitly defined?
Correct Answer is : Compilation succeeds but at the time of creating object using default constructor, it throws compilation error
18. What would be behaviour if the constructor has a return type?
Correct Answer is : Compilation error
19. Which one of the following is not an access modifier?
Correct Answer is : Void
20. All the variables of class should be ideally declared as?
Correct Answer is : private
