Inheritance is one of the four pillars of OOPS. Let’s have a look at it through a mind map.
Points to be noted about Inheritance in Java
- In inheritance, there is a parent-child relationship. i.e. a sub-class extends a super-class.
- “extends” and “implements” are the two keywords to be used to implement inheritance in Java.
- Every class in Java extends the Object superclass.
- A class cannot extend itself.
- To restrict the inheritance of methods and member variables, they need to be declared private in the super-class.
- Constructors and initializers both SIB(Static initialization block) & IIB(Instance initialization block) are not inherited by the subclass but they get executed during the instantiation of the subclass.
- When both super-class and sub-class have a field with the same name, the field in the super-class gets hidden but can be accessed using the super keyword.
- Static method members and variables are also inherited in the sub-class.
Order of execution of Constructor, SIB & IIB in Java Inheritance
The order of execution of inherited classes in Java is the following order:
- Static initializer block of each class
- Instance initializer block followed by constructor from parent to child
Check out our coding video for the same.
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