Method overriding
is when a subclass redefines a method of its superclass, of course the redefined method (of the subclass) has the same name and the same parameter types of the method of its superclass.
When method in subclass has same name and return type as method in super class it is known as?
The subclass is known as the children’s classes that inherit any function or methods from the base or parent or the superclass.
Overriding
is a method where a subclass can inherit any method which has the same class name with the same signature and same returns type.
When a subclass method has the same name as a superclass method is it often said that the subclass method The superclass method?
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.
When both the subclass and the superclass have a method with the same name this keyword is used when you want to call the superclass method?
Methods in a subclass and a superclass can have the same name. If you want to access the method stored in a superclass that has the same name as a subclass method, you have to use
the super keyword
. In this example, we have declared a superclass called BankAccount which has one method: displayAccountType() .
What is the process of defining a function in a subclass having the same name and type signature as a function in its superclass?
2. What is the process of defining a method in a subclass having same name & type signature as a method in its superclass? … Explanation:
To disallow a method from being overridden, specify final as a modifier at the start of its declaration
.
Can constructor be overridden?
Constructors are not normal methods and
they cannot be “overridden”
. Saying that a constructor can be overridden would imply that a superclass constructor would be visible and could be called to create an instance of a subclass.
Why method overriding is used?
The purpose of Method Overriding is that
if the derived class wants to give its own implementation it can give by overriding the method of the parent class
. When we call this overridden method, it will execute the method of the child class, not the parent class.
What is required for an interface method that has a body?
What is required for an interface method that has a body?
The method header must begin with the key word default
. … ClassB must override each method in ClassA.
What method is automatically called when an object is created?
Constructor
is a method that is automatically called when an object of a class is created. They provide initial values in the instance fields.
When a method in a subclass has the same?
When a method in a subclass has the same name and type signatures as a method in the superclass, then the method in the subclass overrides the method in the superclass.
Can you use this () and super () both in a constructor?
both this() and
super() can not be used together in constructor
. this() is used to call default constructor of same class.it should be first statement inside constructor. super() is used to call default constructor of base class.it should be first statement inside constructor.
What does super () do?
The super() in Java is a reference variable that is
used to refer parent class constructors
. super can be used to call parent class’ variables and methods. super() can be used to call parent class’ constructors only.
Can abstract class have constructor?
In abstract class, we have an instance variable, abstract methods, and non-abstract methods. We need to initialize the non-abstract methods and instance variables, therefore
abstract classes have a constructor
. … This is also one of the reasons abstract class can have a constructor.
Which method Cannot be overridden?
A
method declared final
cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.
Which method can be defined only once in a program?
Explanation:
main() method
can be defined only once in a program. Program execution begins from the main() method by java runtime system.
Which keyword is used to call a superclass constructor from child?
Use of super() to access superclass constructor
To explicitly call the superclass constructor from the subclass constructor, we use
super()
. It’s a special form of the super keyword.
