package keyword in java

The "package" keyword specifies the Java package in which the classes declared in a Java source file reside.

Example
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package com.mycompany.services;
 
public class MyCompanyService {
}
package com.mycompany.services;
 
public class MyCompanyService {
}


In the above example, the source file MyCompanyService.java must be placed under the package /com/mycompany/services

Rules regarding the package statement


A source file can be placed under a specific package or default package.

The package statement (if specified) must be the first line in the source file.

Package name must follow the pattern: level1.leve2.level3….leveln
where,
level1.leve2.level3….leveln are the sub packages in the same order.

If a Java source file does not contain a package statement, the classes defined in the file are in the default package.

Note that classes in the default package can not be referenced from classes in non−default packages.

In the example above, the fully−qualified class name of the MyCompanyService class is com.mycompany.services.MyCompanyService

About the Author

Karibasappa G C (KB)
Founder of javainsimpleway.com
I love Java and open source technologies and very much passionate about software development.
I like to share my knowledge with others especially on technology 🙂
I have given all the examples as simple as possible to understand for the beginners.
All the code posted on my blog is developed,compiled and tested in my development environment.
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