Public access modifier in Java - Cheat Sheet & Quick Revision

overview

Recall & Review

beginner

What does the public access modifier mean in Java?

The <code>public</code> access modifier means the class, method, or variable can be accessed from any other class in any package.

beginner

Can a public method be accessed from a different package?

Yes, a public method can be accessed from any other package in the Java program.

intermediate

Which of these is true about public classes in Java?

A <code>public</code> class can be accessed from any other class in any package, and the file name must match the public class name.

beginner

Example: What is the access level of this method?

public void greet() { System.out.println("Hello"); }

The method <code>greet()</code> is <code>public</code>, so it can be called from any other class anywhere in the program.

intermediate

What happens if you do not specify any access modifier in Java?

If no access modifier is specified, the default is package-private, meaning the member is accessible only within the same package, unlike public which allows access from anywhere.

What does the public access modifier allow?

A Access from any other class in any package

B Access only within the same class

C Access only within the same package

D Access only to subclasses

If a class is declared public, where can it be accessed?

A From any package

B Only inside its own class

C Only inside its own package

D Only by subclasses

What must match the file name in Java?

A Any class name

B The <code>public</code> class name

C The package name

D The method name

Which access modifier restricts access to the same package only?

A public

B private

C protected

D default (no modifier)

Can a public method be accessed from a class in a different package?

A Only if subclassed

B No

C Yes

D Only if imported

Explain what the public access modifier does in Java and give an example.

Describe the difference between public and default (no modifier) access in Java.