Core Java - Interview Questions and Answers for 'Packages' | Search Interview Question

Core Java - Interview Questions and Answers for 'Packages' - 6 question(s) found - Order By Newest

Q1. What is a package and what are its advantages ?

Ans. Package is a namespace that organizes a set of related classes.

Advantages of Packages

1. Better Organization of classes.
2. Saves from the problem of duplicate names as duplicate class names are allowed across different packages.

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Q2. Is it a good practice to use Asterick(*) in import statement to load multiple packages with single import statement ?

Core Java

Ans. No, we should be lean in loading only packages which are required. Loading packages which are not being used result in memory overheads.

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Q3. Do we need to import java.lang package ?

Core Java

Ans. No, It is loaded by default by the JVM.

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Q4. What is a Cursor ?

Database

Ans. It's a facility that allows traversal over the records pulled from a table or combination of tables. Its like iterator in Java.

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Q5. Does importing a package imports all its sub packages too ?

Core Java

Ans. No, but we can use wild card (*) to do so

For example -

import java.util.*

will import all packages with name starting with java.util

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Q6. What is RPM ?

Tool

Ans. Redhat Packaging system or rpm is a Package Manager or type of Package Management system extensively used for Linux systems.

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Q7. Which of the following wildcard is used to import multiple packages at once ?

Core Java

a. .

b. ?

c. *

d. &

Ans.c. *

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