If a method in a subclass has the same signature as a method in the superclass
, the subclass method overloads the superclass method. If two methods in the same class have the same name but different signatures, the second overrides the first.
Can subclass overload the methods of superclass?
The following table summarizes what happens when you define a method with the same signature as a method in a superclass. Note: In a subclass,
you can overload the methods inherited from the superclass
.
When the subclass method is intended as a replacement of the superclass method?
Instructions for how to use one apply to all. The subclass method does not invoke the superclass method. Instead the subclass method is intended as
a complete replacement of
the superclass method.
What must a subclass method do in order to override a superclass method?
What must a subclass method do in order to override a superclass method?
Must use the same method name and the same parameter types.
Can a subclass be a superclass?
Definitions: A class that is derived from another class is called a subclass (also a derived class, extended class, or child class). The
class from which the subclass is derived
is called a superclass (also a base class or a parent class).
What is method overloading example?
In Java, two or more methods may have the same name if they differ in parameters (different number of parameters, different types of parameters, or both). These methods are called overloaded methods and this feature is called method overloading. For example:
void func() { .
.. }
What are method overloading rules?
- Have different return types.
- Have different access modifiers.
- Throw different checked or unchecked exceptions.
Which method hides a method in the superclass?
| Superclass Instance Method Superclass Static Method | Instance Method Overrides (must also have the same return type) Generates a compile-time error | Static Method Generates a compile-time error Hides |
|---|
What happens when a method overrides another method?
What happens when a method overrides another method?
It takes precedence over the original method, hiding it.
Can we override already overridden method in Java?
Invoking overridden method from sub-class : We can call parent class method in overriding method using super keyword. Overriding and constructor :
We can not override constructor
as parent and child class can never have constructor with same name(Constructor name must always be same as Class name).
Can we override private method in Java?
1) In Java, inner Class is allowed to access private data members of outer class. … 2) In Java,
methods declared as private can never be overridden
, they are in-fact bounded during compile time.
What does a subclass inherit from a superclass group of answer choices?
d) A subclass may inherit
methods and instance variables
from its superclass, and may also implement its own methods and declare its own instance variables.
Can we change the scope of the overridden method in the subclass?
Yes
, an overridden method can have a different access modifier but it cannot lower the access scope. … Methods declared protected in a superclass must either be protected or public in subclasses; they cannot be private. Methods declared private are not inherited at all, so there is no rule for them.
What is the difference between superclass and subclass?
Superclass and Subclass are two terms that are related to inheritance. … The key difference between the Superclass and Subclass is that
Superclass is the existing class from which the new classes are derived while Subclass is the new class that inherits the properties and methods of the Superclass.
What is the best example of superclass and subclass relationship?
The superclass is also known as the parent class or base class. In the above example, Vehicle is the Superclass and its subclasses are
Car, Truck and Motorcycle
.
When should I use subclass?
The subclass
can just use the items inherited from its superclass as is
, or the subclass can modify or override it. So, as you drop down in the hierarchy, the classes become more and more specialized: Definition: A subclass is a class that derives from another class.
