What is user defined package in Java with example?

User-defined packages are those which are developed by users in order to group related classes, interfaces and sub packages. With the help of an example program, let’s see how to create packages, compile Java programs inside the packages and execute them.

What is user defined package?

A package as the name suggests is a pack(group) of classes, interfaces and other packages. In java we use packages to organize our classes and interfaces. We have two types of packages in Java: built-in packages and the packages we can create (also known as user defined package).

What are the types of packages in Java explain each with an example?

Package in java can be categorized in two form, built-in package and user-defined package. There are many built-in packages such as java, lang, awt, javax, swing, net, io, util, sql etc. Here, we will have the detailed learning of creating and using user-defined packages.

What is package explain with example?

A package is a namespace that organizes a set of related classes and interfaces. Conceptually you can think of packages as being similar to different folders on your computer. You might keep HTML pages in one folder, images in another, and scripts or applications in yet another.

What is the need of user defined package in Java?

A package in Java is used to group related classes. Think of it as a folder in a file directory. We use packages to avoid name conflicts, and to write a better maintainable code.

How do I create a user defined package?

To create a package, follow the steps given below:

Choose a package name according to the naming convention.
Write the package name at the top of every source file (classes, interface, enumeration, and annotations).
Remember that there must be only one package statement in each source file.

How do you create a user defined package?

How to Create a package?

Choose the name of the package.
Include the package command as the first line of code in your Java Source File.
The Source file contains the classes, interfaces, etc you want to include in the package.
Compile to create the Java packages.

What is package and its types?

A package is a collection of similar types of Java entities such as classes, interfaces, subclasses, exceptions, errors, and enums. A package can also contain sub-packages.

What is package explain steps to create package with example?

To create a package, follow the steps given below:

Choose a package name according to the naming convention.
Write the package name at the top of every source file (classes, interface, enumeration, and annotations).
Remember that there must be only one package statement in each source file.

What is meant by package?

noun. a bundle of something, usually of small or medium size, that is packed and wrapped or boxed; parcel. a container, as a box or case, in which something is or may be packed. something conceived of as a compact unit having particular characteristics: That child is a package of mischief.

What is the use of package in Java?

What are the benefits of using packages in Java?

Advantages of using Packages in Java

Make easy searching or locating of classes and interfaces.
Avoid naming conflicts.
Implement data encapsulation (or data-hiding).
Provide controlled access: The access specifiers protected and default have access control on package level.

How to create user defined packages in Java?

To create the user-defined packages we have to use a java keyword called “package”. User-defined packages contain only user-defined classes or interfaces in the form of .class files. The syntax is given below. While writing the package name we can specify packages in any number of levels but specifying one level is mandatory.

How does the name of a Java package work?

Each package in Java has its unique name and organizes its classes and interfaces into a separate namespace, or name group. Although interfaces and classes with the same name cannot appear in the same package, they can appear in different packages. Preventing naming conflicts.

What is the name of The subpackage in Java?

Subpackage in java. Package inside the package is called the subpackage. It should be created to categorize the package further. Let’s take an example, Sun Microsystem has definded a package named java that contains many classes like System, String, Reader, Writer, Socket etc.

How are packages used to group related classes?

A package in Java is used to group related classes. Think of it as a folder in a file directory. We use packages to avoid name conflicts, and to write a better maintainable code. Packages are divided into two categories: Built-in Packages (packages from the Java API) User-defined Packages (create your own packages)