Java tutorial for beginners || Abstraction || Fully Abstraction in Java || Interface
What is Abstraction in java?
Abstraction is a process of hiding the implementation details from the user and only the functionality will be provided to the user.
How can we achieve 100% abstraction in Java?
In Java abstraction is achieved using abstract class and Interface. We can achieve 100% abstraction using Interfaces.
How many types of abstraction in Java?
1. Partial abstraction (Abstract class)
2. Fully abstraction (Interface)
What is an Interface and what are the rules to follow for implementing Interface?
The interface in Java is a mechanism to achieve abstraction. There can be only abstract methods in the Java interface, not the method body. It is used to achieve abstraction and multiple inheritance in Java
1. To declare an interface, use the interface keyword.
2. It is full abstraction. Contains only the abstract methods. That means all the methods in an interface are declared with an empty body and are public, abstract by default.
3. A class that implements an interface must override all its methods
4. To implement interface use implements keyword.
5. Interface do not have constructor as it cannot be used to create objects
Object cannot be created directly for Interface with “new Keyword” because Abstract methods don’t have implementation/method body.
Why do we use an Interface?
To achieve security - hide certain details and only show the important details of an object (interface).
How can we achieve multiple inheritance using Interface.
Java does not support "multiple inheritance" (a class can only inherit from one superclass). However, it can be achieved with interfaces, because the class can implement multiple interfaces.
What is an interface in Java?
Abstraction interview question for Automation tester, Senior automation tester, Test engineer, Java Developer
Partial abstraction interview question for Automation tester, Senior automation tester, Test engineer, Java Developer
java tutorial for beginners
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