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Understanding Access Modifiers in Java: A Comprehensive Guide

Table of Contents

Access modifiers in Java are fundamental constructs that determine the scope and accessibility of classes, methods, and other members. They play a crucial role in object-oriented programming by helping to encapsulate and protect data. This article delves into the different types of access modifiers in Java, illustrating their use with practical examples.

Introduction to Access Modifiers

In Java, access modifiers are keywords used before class, method, or variable declarations to define their accessibility. Understanding these modifiers is crucial for structuring your Java applications effectively.

Types of Access Modifiers

Java provides four primary access modifiers:

  1. Public: Accessible from any other class.
  2. Protected: Accessible within the same package and subclasses.
  3. Default (Package-Private): Accessible only within the same package.
  4. Private: Accessible only within the class it is declared.

Public Modifier

The public keyword makes the class, method, or field accessible from any other class. For instance:

public class PublicExample {
    public void display() {
        System.out.println("Public Access Modifier");
    }
}

In this example, the display method can be accessed from any other class.

Protected Modifier

The protected modifier restricts access to the same package and any subclass. Consider this example:

package com.example;

public class ProtectedExample {
    protected void display() {
        System.out.println("Protected Access Modifier");
    }
}

class Subclass extends ProtectedExample {
    // The display method can be accessed here
}

Default Modifier

If no access modifier is specified, Java uses a default modifier, allowing access only within the same package. Here’s how it works:

package com.example;

class DefaultExample {
    void display() {
        System.out.println("Default Access Modifier");
    }
}

class SamePackage {
    // The display method can be accessed here
}

Private Modifier

The private modifier restricts the visibility to the class itself. It’s often used in encapsulation. Example:

public class PrivateExample {
    private void display() {
        System.out.println("Private Access Modifier");
    }
}

Conclusion

Understanding and correctly implementing access modifiers in Java is vital for secure and efficient code. They help in encapsulating data and defining a clear structure for your Java programs.

Picture of Sarang Sharma

Sarang Sharma

Sarang Sharma is Software Engineer at Bito with a robust background in distributed systems, chatbots, large language models (LLMs), and SaaS technologies. With over six years of experience, Sarang has demonstrated expertise as a lead software engineer and backend engineer, primarily focusing on software infrastructure and design. Before joining Bito, he significantly contributed to Engati, where he played a pivotal role in enhancing and developing advanced software solutions. His career began with foundational experiences as an intern, including a notable project at the Indian Institute of Technology, Delhi, to develop an assistive website for the visually challenged.

Written by developers for developers

This article was handcrafted with by the Bito team.

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