oops

Which statement about Java classes is true?

• A class must always contain a main method

• A class can have multiple constructors

• A class can’t have private fields

• An object can be created without a class

Which members are not inherited by a subclass?

• Constructors

• Private fields

• Static methods

• Both (a) and (b)

B can override A’s private methods

• If class B extends class A, what is correct?

• B can call A’s constructor directly

• B automatically inherits all public and protected members

• B cannot access A’s fields at all

What is method overriding?

• a) Same method name, different return type, same class
  

• b) Same method name, different parameters, same class
  

• c) Same method name, same parameters, different class (inherited)
  

• d) Different method name, same class

Which is runtime polymorphism?

• a) Method Overloading
  

• b) Method Overriding
  

• c) Constructor Overloading
  

• d) Static method hiding

Which is true about interfaces?

• a) A class can implement multiple interfaces
  

• b) An interface can extend multiple interfaces
  

• c) An interface can extend a class
  

• d) Both a and b

When an object is created:

• a) Only methods are loaded into memory
  

• b) Only data members are loaded into memory
  

• c) Both data members and methods are loaded
  

• d) Only constructor is loaded

Which one is not polymorphism?

• a) Method overloading
  

• b) Method overriding
  

• c) Operator overloading
  

• d) Interface implementation

Which statement is true?

• a) Abstract class supports multiple inheritance
  

• b) Interface supports multiple inheritance
  

• c) Both class & interface support multiple inheritance
  

• d) None support multiple inheritance

Which is valid declaration?

• a) abstract final class Test {}
  

• b) public abstract class Test {}
  

• c) static abstract class Test {}
  

• d) private abstract class Test {}