Java Inheritance Quiz

What keyword is used to inherit a class in Java?

• extends

• implements

• inherits

• uses

Which of the following is true about the superclass and subclass relationship in Java?

• A subclass cannot access the private members of its superclass.

• A subclass inherits all the methods and fields from its superclass, including private fields.

• A subclass must override all the methods from its superclass.

• A superclass can inherit from a subclass.

What is method overriding in Java?

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

• Providing a specific implementation of a method that is already provided by its superclass.

• Removing a method from the superclass in the subclass.

• Calling a method from the superclass in the subclass.

Which of the following is a correct way to call a superclass method from a subclass in Java?

• super.methodName();

• this.methodName();

• superclass.methodName();

• methodName();

If a method is declared as final in the superclass, what can the subclass do with this method?

• The subclass can override the method.

• The subclass cannot override the method.

• The subclass can only call the method, not override it.

• The subclass can delete the method.

Which of the following is NOT a rule for method overriding in Java?

• The argument list must exactly match that of the overridden method.

• The return type must be the same or a subtype of the return type declared in the original overridden method.

• A method declared final cannot be overridden.

• The overriding method must always be static if the overridden method is static.

What happens if the `@Override` annotation is used with a method that does not override a superclass method?

• The program will compile without any errors.

• The program will throw a runtime exception.

• The compiler will generate an error.

• The method will be ignored during execution.

In Java, which keyword is used to refer to the parent class of a class?

• parent

• super

• this

• base

Which of the following statements is true about constructors and inheritance in Java?

• A subclass inherits all the constructors of its superclass.

• A subclass must override all the constructors of its superclass.

• Constructors are not inherited.

• Only parameterless constructors are inherited.

What is the output of the following code snippet if `class B extends A` and both classes have a method `display()` that prints "A" in class A and "B" in class B, and method `display()` of class B calls `super.display()`? ```java B obj = new B(); obj.display(); ```

• A

• B

• AB

• BA