Java Inheritance Flashcard

Front

What keyword is used to inherit a class in Java?

Back

extends

Front

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.

Back

A subclass cannot access the private members of its superclass.

Front

What is method overriding in Java?

Back

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

Front

Which of the following is a correct way to call a superclass method from a subclass in Java? Options: super.methodName();, this.methodName();, superclass.methodName();, methodName();

Back

super.methodName();

Front

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

Back

The subclass cannot override the method.

Front

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.

Back

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

Front

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

Back

The compiler will generate an error.

Front

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

Back

super

Front

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.

Back

Constructors are not inherited.

Front

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();
```

Back

AB