So the version in Manager got executed. Had that method been not overridden in Manager, then the invocation could have executed the Emp version. In the above example, all the methods are normal default.
So they cannot be accessed from other packages. If we make a feature a protected, then they can be accessed anywhere in the current package and from child classes of other packages. If we make a feature as public, then there is no restriction, such elements can be accessed from anywhere. Through interfaces also, we can see multi-level inheritance.
A similar thing can be achieved using abstract classes also. Even though we can have any number of classes abstract classes involved in this sequence, a final class cannot be used as a parent class. So the following code is not valid. Other formations of inheritance:.
When there are only 2 classes involved and one is the parent and another is the child, such inheritance is known as a simple inheritance single-level inheritance. When there are 3 or more classes involved and there is a common parent for 2 or more child classes, such relation is hierarchical inheritance. When there are multiple parent classes for a child class, such inheritance is known as multiple inheritances. This kind of inheritance is not supported in Java with classes.
R Programming. React Native. Python Design Patterns. Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Company Questions. Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking.
Computer Graphics. Software Engineering. Web Technology. Cyber Security. C Programming. Control System. Data Mining. Thus if there is a class that extends features of this derived class, then it is said to be a grandchild of the base class that has all features of parent and child class. Consider a class A as a parent class, class B as a child class of class A and class C as a child class of class B.
When we declare this object, the constructor of class C is called. As we know, while constructor of a child class first constructor of its parent class is called.
Thus when we call C — then B constructor gets called, and further, as B is a child class for class B, thus A is called. Then control gets back to the child class. Thus in the following series, constructors are executed:. But when a method is called using this object of a child class, first it is checked if that method with the same signature is present in the child class.
If not, then control is directed to its parent class to find the method. Thus, in this case, when fun1 is called using object obj, control goes to C and find there is no such method; thus, control goes to B and thus class A. The reason for this is because one can easily redefine the methods of the parent class in its child class, known as method overriding. Thus first preference is given to the overridden method.
In this way, Multilevel inheritance implements the inheritance feature in classes at multiple levels. This type of inheritance is most often used while implementing data augmentation — that is, the process of increasing the diversity and amount of existing data without updating the existing code.
Then we have class television that extends the Electronics class, which specifies the Electronics device and has a method name — category to display the type of electronic device.
0コメント