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10 Questions

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Packages and Interfaces in Java

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Questions and Answers

What is the purpose of using packages in Java?

Controlling the access level of classes

Specifying the behavior of classes

Defining interfaces for classes

Managing and partitioning the class name space (correct)

How can you define a class as part of a package in Java?

By starting the class with the 'package' keyword (correct)

By ending the class with the 'package' keyword

By importing the package at the end of the class

By placing the class in a folder with the package name

Which access specifier allows access to members within the same package but not by subclasses?

public

private

protected

default (no specifier) (correct)

How can you bring a class from a specific package into visibility in your Java class?

By specifying its package as a prefix when using it Signup and view all the answers

What is the main purpose of an interface in Java?

To specify what a class must do without detailing how it does it Signup and view all the answers

What is a key characteristic of interfaces in Java?

Declare methods without implementation Signup and view all the answers

How do classes implement an interface in Java?

By providing an implementation for all methods defined in the interface Signup and view all the answers

What is a requirement for a method declaration in an interface?

Must end with a semicolon Signup and view all the answers

Can a class implement multiple interfaces in Java?

Yes, any number of interfaces can be implemented by a class Signup and view all the answers

Are the variables declared in an interface mutable?

No, all variables in an interface are implicitly final and static Signup and view all the answers