Packages

Question 1

What are packages in Java and their uses?

Answer 1

Question 2

How is a package created in Java?

Answer 2

Question 3

How are multiple levels of packages created?

Answer 3

Question 4

How are classes in a package used in another package?

Answer 4

Note: To import all the classes in below example use:

import com.intertech.transport.*

• A class can have as many import statements as needed.
• All import statements must go between the package statement and the class declaration.

Question 5

More about imports.

Answer 5

Question 6

More import rules

Answer 6

Question 7

What are the default packages imported when we write a new Java class?

Answer 7

Question 8

Where does the compiler find the path of the packages and classes?

Answer 8

Question 9

What is the command used to provide classpath option?

Answer 9

Question 10

How are java files and packages delivered or archived?

Answer 10

Question 11

What are the advantages of using a JAR?

Answer 11

Question 12

What is the command to create a JAR file?

Answer 12

Although the command-line option is available to create a JAR, most of the IDE’s provide an export option to create a JAR file.

Question 13

Some JAR bundling rules.

Answer 13