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What Is the Difference Between a Package and a Module in Java?


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The Java platform module system (JPMS), sometimes known as Java modules, was introduced as a new feature in Java. It is now possible to collect Java packages and code them into a single object known as a module. The lack of a module concept in early Java editions makes managing all of the programs difficult. To remedy this, Java reorganized the JDK into numerous modules, allowing developers to just access the components they need for a project rather than the full JDK. In addition to the JDK, Java now allows programmers to create modules for constructing module-based applications. Let’s look into Java roles to understand the distinction between packages and modules in Java. In this tutorial, we’ll go over what package and a module in java are and how to use them.

What is the Java Model and it’s Fundamentals?

Using this packaging approach, developers can package a Java application or an API into independent Java modules. Developers can also specify which Java packages within a module should be available to other Java modules via a modular JAR file. Using Java modules has numerous advantages for Java developers. The following are some of the primary advantages of using Java modules for application development:

1. Applications are more easily distributed.

JPMS divides all Java platform APIs into various modules. It allows developers to specify which modules are required by an application. Using this information, Java may package your program with only the required API Java modules. Without JPMS, you would have had to incorporate all of the APIs in your application. Because of the underutilized APIs, the application was usually overly large and difficult to provide.

2. Internal packages should be encapsulated better.

The Java module must specifically specify which Java packages within the module can be seen by users of other Java modules. The Java module can only use the hidden modules inside. It generates extremely well-encapsulated packages.

3. The start of missing class detection

As of Java and later, Java programs are now packaged in Java modules. As a result, each application module must list the Java API components that it requires. Organizations now verify the whole module dependency hierarchy to ensure there are no missing modules. The JVM reports missing Java modules and shuts down if they are not found. Prior to Java, missing classes were not discovered until the application attempted to use them during runtime. If the required class is not found by then, the application will crash.

The Benefits of Using Java Modules

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After discussing the benefits of Java modules, let’s look at some of the principles of Java modules.

1. The quantity of packages

Java modules usually incorporate one or more Java packages from the same application. A module could be a piece of the Java Platform or a whole Java program.

2. Java component naming

A Java module requires a unique name. It follows the same naming requirements as Java packages, with the exception that underscores are not permitted because Java intends to utilize them as reserved identifiers in the future. This applies to both packages and classes.

3. Module description

Java modules require the module-info.java Java module descriptor. It should be in the module root directory. The module description specifies which packages must be exported as well as which extra packages the module requires.

4. Module exports

As previously said, packages required for the other modules must be properly identified. The exported packages are declared in the module descriptor.

What Is the Difference Between package and a module in java?

The Java Platform Module System (JPMS) is introduced in Java. The Java Platform Module System is sometimes known as Java Jigsaw or Project Jigsaw, depending on where you read it. Jigsaw was the internal project name used during development. Jigsaw later embraced the name. A package’s namespace is a collection of linked classes and interfaces.

What is a Python Package?

As previously noted, in order to construct big-scale-based real-world applications, enormous code is divided into smaller portions to perform distinct functionalities, resulting in a high number of modules. We construct a Python package with a __init__.py file that informs the Python Interpreter that the provided folder is a Python Package in order to interact with all of the modules.

A Python package acts as a user-variable interface for any source code. This functionality allows any functional runtime script to use a Python package at a certain point in time, demonstrating the primary distinction between the module and the package in Python.

What Distinguishes a Python Package from a Module?

When using a library, a Python package describes the code as a separate unit for each function. While modules are a separate library with built-in functionality, the advantage of packages over modules is reusability. In Python, this is the distinction between a module and a package.

1. Namespaces that are explicit

It assigns the default namespace to the program when it is interpreted for the first time. These namespaces serve as the source code for identifying the coding. A novice coder, on the other hand, can integrate them from the library. To run code correctly, it is usually recommended to be conversant with general namespaces.

2. API for ease of use

In general, this is a method of naming space-specific code objects. It takes the user directly to the heart of the code, making it easy to spot issues. It also facilitates in the interpretation of the codes to be utilized as user interface codes when necessary.


In this post, we talk about what is the Difference between a Package and a Module in Java. We provide information about Difference between a Package and a Module in Java. If any of our readers have questions, they can tell us in the area below.


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