Implementation of User Defined Packages

// MyClass.java
package myPackage;

public class MyClass {
    public void displayMessage() {
        System.out.println("This is a method from MyClass in myPackage.");
    }
}Code language: PHP (php)

Step 3: Compile the Package Class

• Open the command prompt and navigate to the parent directory of myPackage.

javac myPackage/MyClass.java

This will generate a MyClass.class file inside the myPackage folder.

Step 4: Create a Java Class to Use the Package

• In the same parent directory, create another Java file named TestPackage.java to use the myPackage package.

// TestPackage.java
import myPackage.MyClass;

public class TestPackage {
    public static void main(String[] args) {
        MyClass obj = new MyClass();
        obj.displayMessage();
    }
}Code language: JavaScript (javascript)

Step 5: Compile the Main Class

• In the command prompt, compile the TestPackage.java file:

javac TestPackage.javaCode language: CSS (css)

Step 6: Execute the Main Class

• Run the main class using the java command:

java TestPackage

Expected Output:

This is a method from MyClass in myPackage.Code language: JavaScript (javascript)

Example:

Demonstrates the use of user-defined packages in Java by organizing different software skills of LotusJavaPrince into specific packages.

// Package for Debugging skills
package lotusjavaprince.skills.debugging;

public class Debugging {
    public void execute() {
        System.out.println("LotusJavaPrince excels in Debugging Mastery!");
    }
}

// Package for Optimization skills
package lotusjavaprince.skills.optimization;

public class Optimization {
    public void execute() {
        System.out.println("LotusJavaPrince implements Algorithmic Optimization!");
    }
}

// Package for Testing skills
package lotusjavaprince.skills.testing;

public class Testing {
    public void execute() {
        System.out.println("LotusJavaPrince conducts Comprehensive Testing!");
    }
}

// Main class to demonstrate the use of the packages
import lotusjavaprince.skills.debugging.Debugging;
import lotusjavaprince.skills.optimization.Optimization;
import lotusjavaprince.skills.testing.Testing;

public class SkillDemo {
    public static void main(String[] args) {
        Debugging debugging = new Debugging();
        Optimization optimization = new Optimization();
        Testing testing = new Testing();

        debugging.execute();
        optimization.execute();
        testing.execute();
    }
}