Java - Classes / Packages

package com.peter.car;

import com.peter.parts.Color;   // importing from package from com.peter.parts
import com.peter.parts.Motor;

public class Main {

    public static void main(String[] args) {

        String str = "This is your order.";
        Color ObColor = new Color(str);    // Constructor

        ObColor.Red();

        Motor ObMotor = new Motor();
        ObMotor.hybrid();

        Add ObAdd = new Add();
            String str1 = ObAdd.addTwo("Peter ", "Excellent Choice");
        System.out.println(str1);

    }

}
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package com.peter.parts;

public class Color {

    public Color(String st){        // Constructor
        System.out.println(st);
    }

    public void Red(){
        System.out.println("Red Color");
    }

    public void Yellow(){
        System.out.println("Yellow Color");
    }
}

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package com.peter.parts;

public class Motor {
    public void hybrid(){
        System.out.println("Hybrid Engin");
    }

    public void v6(){
        System.out.println("v6 Engine");
    }
}

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package com.peter.car;

public class Add {
    String addTwo(String first, String second){   // ====> Method with arguments
        return first + second;
    }
}