ModeFactory.java

public class ModeFactory {              // factory pattern
    public Mode createMode(String mode) {
        if ("Dark Mode".equalsIgnoreCase(mode))              // if mode parameter equals to dark mode
            return new DarkMode();                            // creating an object from DarkMode class

        else if ("Light Mode".equalsIgnoreCase(mode))        // if mode parameter equals to light mode
            return new LightMode();                           // creating an object from LightMode class

        else if ("Vincent Mode".equalsIgnoreCase(mode))      // if mode parameter equals to vincent mode
            return new VincentMode();                         // creating an object from VincentMode class

        else if ("Nature Mode".equalsIgnoreCase(mode))       // if mode parameter equals to nature mode
            return new NatureMode();                          // creating an object from NatureMode class
        else
            return null;
    }
}