How do you implement abstraction in java

Change Language. Related Articles. Basics of Java. Operators in Java. Packages in Java. Flow Control in Java. Loops in Java. Jump Statements in Java. Arrays in Java. Strings in Java. OOPS in Java. Constructors in Java. Interfaces in Java. Keywords in Java. Exception Handling in Java. Object-oriented programming has four pillars that are an abstraction, polymorphism, encapsulation, and inheritance. In this section, we will discuss one of them, abstraction.

Along with this, we can also learn how to achieve abstraction in Java. Abstraction is a feature of OOPs. The feature allows us to hide the implementation detail from the user and shows only the functionality of the programming to the user.

Because the user is not interested to know the implementation. It is also safe from the security point of view. Let's understand the abstraction with the help of a real-world example.

The best example of abstraction is a car. When we derive a car, we do not know how is the car moving or how internal components are working? But we know how to derive a car. It means it is not necessary to know how the car is working, but it is important how to derive a car. The same is an abstraction. The same principle as we have explained in the above example also applied in Java programming and any OOPs.

In the language of programming, the code implementation is hidden from the user and only the necessary functionality is shown or provided to the user. We can achieve abstraction in two ways:. Abstract classes are the same as normal Java classes the difference is only that an abstract class uses abstract keyword while the normal Java class does not use.

We use the abstract keyword before the class name to declare the class as abstract. Remember that, we cannot instantiate create an object an abstract class. An abstract class contains abstract methods as well as concrete methods.

If we want to use an abstract class, we have to inherit it from the base class. If the class does not have the implementation of all the methods of the interface, we should declare the class as abstract. It provides complete abstraction. It means that fields are public static and final by default and methods are empty.

It is used to define generic types of behavior at the top of an OOPs class hierarchy and use its subclasses to provide implementation details of the abstract class. Let's see an example of an abstract class.

In Java, an interface is similar to Java classes. The difference is only that an interface contains empty methods methods that do not have method implementation and variables. Please mail your requirement at [email protected] Duration: 1 week to 2 week.

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