Encapsulation in Java

Encapsulation is one of the most important concepts of Object-Oriented Programming (OOP).

Encapsulation means wrapping data (variables) and methods together into a single unit called a class.

It is mainly used to protect data from direct access and improve security.

In Java, encapsulation is achieved by:

• Declaring variables as private
• Accessing them using getter and setter methods

This helps control how data is used or modified.

For example:

• A student’s marks should not be changed directly from outside the class
• Instead, getter and setter methods are used to safely access or update the data

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Why Use Encapsulation?

• Improves data security
• Prevents unauthorized access
• Makes code more organized
• Provides better control over data
• Helps achieve data hiding

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Example

class Student {

    // Private variable
    private String name;

    // Setter method
    public void setName(String name) {
        this.name = name;
    }

    // Getter method
    public String getName() {
        return name;
    }
}

public class Main {
    public static void main(String[] args) {

        Student obj = new Student();

        obj.setName("Rahul");

        System.out.println(obj.getName());
    }
}

Output

Rahul

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Explanation

In this example:

• name variable is declared as private
• It cannot be accessed directly outside the class
• setName() method is used to set the value
• getName() method is used to get the value

This process is called Encapsulation because the data is protected and accessed in a controlled way.

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Conclusion

Encapsulation helps make Java programs more secure, organized, and maintainable. It protects data from direct access and allows controlled interaction using getter and setter methods.