Скачать или смотреть Java new Batch - Class 16- Java Packages -How to create a Java Package explained in detail

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Java Packages:-
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When you develop an application, the application gets divided into many modules in the form of packages.
In Java, packages are a way to group related classes, interfaces, and sub-packages. They are used to organize the code and make it easier to manage, maintain, and navigate. Packages also provide access control and can prevent naming conflicts.
Java Packages:-
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A java package is a collection of similar type of classes, interfaces and Sub packages.
Java Packages are categorized into 2 types:-

1. Inbuild or Predefined package - java, lang, io, util, awt etc
2. User Defined packages

Advantages:-
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1. Reusability
2. Modularity

How to create a java package by using notepad and run in command prompt?
The syntax to create package is as follows.

Syntax:-
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package nameofthepackage;

The package name(nameofthepackage) should be a very meaningful name.
A new folder will be created with respect to the name of the package.

Compilation
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The following command performs the compilation in the command prompt.
Compilation - javac -d . filename.java
-d represents the destination
. represents the current directory.

Once the above command is run, it performs compilation as well as the package creation in the current directory. And, the .class file will be placed in the created package.

Execution
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The following command in the command prompt performs the execution .

Execution - java packagename.classname

Once the above command is run, it performs the execution. As the .class files are placed in the package, the package name should be used with the . operator to get access to the .class file name.

// HelloWorld.java
package pkg;

public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}

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