Java Packages

Which keyword is used to define a package in Java?

• import

• package

• extends

• implements

What is the default package that is automatically available to every Java program?

• java.io

• java.lang

• java.util

• java.sql

Which statement correctly imports all classes from the java.util package?

• import java.util.*;

• include java.util.*;

• use java.util.*;

• import all java.util;

Packages in Java primarily help with which of the following?

• Memory allocation

• Code reusability

• Namespace management

• Compilation speed

A fully qualified class name consists of which components?

• Only class name

• Package name + class name

• Import statement

• None of these

Can two classes with the same name exist in different packages?

• Yes

• No

What is the correct syntax to refer to a class from another package without an import when creating an object?

• package.className

• import package.className;

• package::className

• Use the fully qualified name package.className

Which package is automatically imported in every Java program?

• java.io

• java.lang

• java.util

• java.sql

What is the hierarchy of packages called in Java?

• Module tree

• Package chain

• Namespace

• Package hierarchy

Wrapper classes are primarily used to:

• Convert objects to primitives

• Convert primitives to objects

• Perform file I/O

• Handle exceptions