Quiz-Girlz

What is the purpose of the 'super' keyword in Java?

• It calls the constructor of the parent class

• It creates a new instance of the current class

• It allows access to private members of the parent class

• It defines a new method in the child class

What does the "extends" keyword signify in Java?

• It allows one class to inherit the properties and methods of another class

• It is used to create an instance of a class

• It defines a new method in a class

• It is used to implement an interface

Which of the following classes does not directly extend the Object class?

• String

• Integer

• Array

• All classes in Java directly extend Object class

Which of the following is a valid type of inner class in Java?

• Static inner class

• Member inner class

• Local inner class

• All of the above

Which of the following is NOT a valid reason to overload a method in Java?
- To perform similar operations with different argument types
- To change the return type of a method
- To perform similar operations with a different number of arguments
- To improve code readability and reusability

• To perform similar operations with different argument types

• To change the return type of a method

• To perform similar operations with a different number of arguments

• To improve code readability and reusability

What happens if a subclass does not have a constructor defined explicitly in Java?

• The subclass will automatically call the constructor of the superclass.

• The subclass will throw a compilation error.

• The subclass will inherit the constructor from another subclass.

• The subclass will create a default constructor with no parameters.

Which of the following is true about method overloading?

• The return type must be different for overloaded methods

• The method name must be different for overloaded methods

• Overloaded methods can have different parameter types or number of parameters

• Overloading is not allowed in Java

Which of the following is true about Java interfaces?
An interface can have method implementations,
A class can implement multiple interfaces,
An interface can extend a class,
An interface can only have variables

• An interface can have method implementations

• A class can implement multiple interfaces

• An interface can extend a class

• An interface can only have variables

Can a constructor be overloaded in Java?

• No

• Only in certain cases

• Yes

• Only with inheritance

What is the purpose of the "super()" keyword in a subclass constructor?

• It invokes the constructor of the parent class

• It creates a new instance of the subclass

• It allows access to private members of the parent class

• It overrides methods in the parent class