Access Modifier. When to Use and When Not to Use for class, method, variable, and constructors.

July 14 2026

Access modifiers Definition :

• Access modifiers in Java are keywords that control the visibility and accessibility of classes, methods, variables, and constructors.
• They play a fundamental role in enforcing encapsulation (data hiding).

There are four types of Access modifiers

1. Private

• The private access modifier in Java .
• Members marked as private can only be accessed within the exact same class where they are declared.

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2. Default (Package-Private)

• When you do not specify an explicit access modifier, Java automatically applies the default access level.
• Components are accessible only by classes residing in the same package.

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3. Protected

• Accessible within the same class, package, and subclasses.
• Also, access different package subclasses (Child class)
• Cannot allow a different package non-subclass

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4. Public

• Components are accessible from anywhere in the program

https://www.sitesbay.com/java/images/access-modifiers-in-java.png

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When to Use and When Not to Use for class, method, variable, and constructors.

Key Points

• Access Modifiers for Classes

• public Accessible from anywhere.

• Default (no modifier) Accessible only within the same package.

• Private and protected cannot be used with top-level classes.

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• Access Modifiers for method

• public Accessible from anywhere.

• protected Accessible within the same package and by subclasses in other packages.

• Default (no modifier) Accessible only within the same package.

• private Accessible only within the same class.

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• Access Modifiers for variables

• public Accessible from anywhere.

• protected Accessible within the same package and by subclasses in other packages.

• Default (no modifier) Accessible only within the same package.

• private Accessible only within the same class.

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• *Access Modifiers for Constructors *

• public The constructor can be called from anywhere.

• protected Constructor can be called within the same package and by subclasses in other packages.

• Default (no modifier) Constructor can be called only within the same package.

• private → Constructor can be called only within the same class.