UML0 22-Difference between Abstraction and Encapsulation in Java with Examples - GeeksforGeeks

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Difference between Abstraction and Encapsulation in Java with
Examples
Last Updated : 4 May, 2026
Abstraction and Encapsulation are two fundamental concepts of Object-Oriented Programming in
Java. Both help in designing secure, maintainable, and flexible applications, but they serve different
purposes. Understanding their difference is important for writing clean and scalable code.
Both are core principles of OOP in Java
Help in improving code security and maintainability
Often used together but solve different problems
Abstraction
Abstraction focuses on hiding implementation details and showing only the essential features of an
object. It allows you to define what an object does without explaining how it does it.
Achieved using abstract classes and interfaces
Hides complex logic from the user
Improves flexibility and reduces code complexity
Real-Life Example: When you drive a car, you just use the steering, brake, and accelerator. You
don’t need to know how the engine works internally.
Output
Car starts with key
Explanation: The Vehicle class declares an abstract method start() without implementation and Car
class provides the actual implementation of the start() method. User only calls start() without
knowing how it works internally (implementation is hidden).
abstract class Vehicle {
 abstract void start(); // abstract method
}
class Car extends Vehicle {
 void start() {
 System.out.println("Car starts with key");
 }
}
public class Geeks{
 public static void main(String[] args) {
 Vehicle v = new Car();
 v.start();
 }
}
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Encapsulation
Encapsulation focuses on wrapping data (variables) and methods into a single unit and restricting
direct access to the data. It protects the internal state of an object.
Achieved using private variables and getter/setter methods
Provides data security and control
Helps in maintaining integrity of data
Real-Life Example: A bank account does not allow direct access to balance. You can only access
or modify it through methods like deposit() or withdraw().
Output
90
Explanation: The variable marks is declared as private, so it cannot be accessed directly. The
getMarks() method is used to read the value, and setMarks() is used to update it. This ensures
controlled access and prevents invalid data from being assigned.
Abstraction vs Encapsulation
Feature Abstraction Encapsulation
Definition
Abstraction is the process of hiding
implementation details and showing only
functionality to the user.
Encapsulation is the process of binding
data and methods together and restricting
direct access to data.
Focus
Abstraction focuses on what an object
does rather than how it does it.
Encapsulation focuses on protecting data
by controlling how it is accessed.
class Student {
 private int marks; // private variable
 public int getMarks() {
 return marks;
 }
 public void setMarks(int marks) {
 if(marks >= 0) {
 this.marks = marks;
 }
 }
}
public class Geeks{
 public static void main(String[] args) {
 Student s = new Student();
 s.setMarks(90);
 System.out.println(s.getMarks());
 }
}
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Feature Abstraction Encapsulation
Goal
Abstraction helps reduce complexity and
improve code maintainability.
Encapsulation helps ensure data security
and maintain data integrity.
Level
Abstraction works at the design or
interface level.
Encapsulation works at the
implementation level.
Implementation
Abstraction is implemented using
abstract classes and interfaces.
Encapsulation is implemented using
access modifiers like private, public, and
protected.
Data Handling
Abstraction exposes only the necessary
features to the user.
Encapsulation hides data and provides
controlled access using getters and
setters.
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