Java Inheritance Quiz

What is single inheritance in Java?

• A class inherits properties from more than one class.

• A class inherits properties from another class.

• A class does not inherit any properties.

• A class inherits properties from itself.

What is method overriding in Java?

• Changing the value of a method's parameters in the subclass.

• Removing a method from the superclass in the subclass.

• A subclass provides a specific implementation of a method that is already provided by its superclass.

• A subclass method calls a method in the superclass with the same parameters.

What does the `super` keyword in Java do?

• It is used to call the superclass version of a method.

• It creates a new instance of the superclass.

• It refers to the superclass object itself.

• It is used to override methods in the superclass.

Which of the following is a correct example of single inheritance?

• class A extends B, C {}

• class A extends B {}

• class A {}

• class A extends B { class C extends D {} }

In hierarchical inheritance, if class A is the superclass, which of the following is a possible set of subclasses?

• class B extends C, class D extends E

• class B extends A, class C extends A

• class B extends A, class A extends C

• class B extends C, class C extends A

Which of the following is true about method overriding?

• The overriding method must have a different return type.

• The overriding method must have the same parameter list as the method in the superclass.

• The overriding method can have a lower access modifier than the method in the superclass.

• The overriding method must be static if the method in the superclass is static.

How can the `super` keyword be used in constructors?

• To call a parameterized constructor of the superclass.

• To override the constructor of the superclass.

• To hide the constructor of the superclass.

• To create a new instance of the superclass.

Which of the following is not a feature of single inheritance?

• A subclass can inherit methods and fields from only one superclass.

• A subclass can inherit methods and fields from multiple superclasses.

• A subclass can extend the functionality of a superclass.

• A subclass can override methods from the superclass.

In hierarchical inheritance, which class is at the top of the hierarchy?

• The subclass with the most methods.

• The superclass from which other classes inherit.

• The subclass that does not inherit from any class.

• The class with the most fields.

What is required for method overriding to occur?

• The method must be static in the superclass.

• The method in the subclass must have a different name than the method in the superclass.

• The method in the subclass must have the same signature as the method in the superclass.

• The method in the subclass must return a different type than the method in the superclass.