Write A Program In Java To Demonstrate Use Of Package

In this program, we will create a java program to understand the use of package.

Before demonstrate the program we will understand the concept of package.

In java, a package is a way to organize related classes and interfaces into a single namespace. Packages help to avoid naming conflicts and make it easier to manage large projects.

To create a package in java, you use the `package` keyword followed by the name of the package. For example:

Package mypackage;

 

This statement creates a package called `mypackage`. Any classes or interfaces defined after this statement will be part of the `mypackage` package.

You can also create subpackages by using dot notation. For example:

Package mypackage.Mysubpackage;

 

This creates a subpackage called `mysubpackage` within the `mypackage` package.

To use classes or interfaces from a package in your code, you need to either use their fully qualified name (e.G., `mypackage.Myclass`) or use an import statement (e.G., `import mypackage.Myclass;`).

Here's a program in java that show the use of package:

Program

// file: mypackage/MyClass.java
package mypackage;
public class MyClass 
{
    public static void sayHello() 
    {
        System.out.println("Hello, world!");
    }
}
// file: Main.java
public class Main 
{
    public static void main(String[] args) 
    {
        mypackage.MyClass.sayHello();
    }
}

Run

To compile and run this program, we need to save the MyClass and Main classes in separate files and compile them separately. We can use the following commands to do this:

$ javac mypackage/MyClass.java
$ javac Main.java
$ java Main

Output

Hello, world!

Explanation

In this example, we have a class called MyClass inside a package called mypackage. The MyClass class has a static method sayHello() that prints a message to the console.

In the Main class, we access the MyClass by specifying its full package name (mypackage.MyClass). We then call its sayHello() method to print a message to the console.

This will compile the MyClass and Main classes, and then run the Main class, which will output the message "Hello, world!" to the console.

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