// import existing packages
import org.code.neighborhood.*;

// Defining a class called MyNeighborhood
public class MyNeighborhood {
    public static void main(String[] args) {
        // creating an instance of PainterPlus() with variable name myBackgroundPainter
        PainterPlus myPainterPlus = new PainterPlus();
        // Running turnRight() method from PainterPlus instance
        myPainterPlus.turnRight();
    }
  }

// Creating subclass of PainterPlus which inherits attributes from superclass Painter
public class PainterPlus extends Painter {
    public PainterPlus() {
      super();
    }
    // Defining public turnRight() method with no return types in PainterPlus class
    public void turnRight() {
      turnLeft();
      turnLeft();
      turnLeft();
    }
}

Key Learnings

  • Creating and using objects
    • use "public class" to create a class
      • Within the class, use "public" to define methods that can used outside and inside the class and "private" to define methods that can only be used within the class.
      • "void" is used to specify that the respective method does not return anything
      • "static" means that no matter how many times the method is initialized, it will only be created once, therefore all instances created shares a single field. It belongs to itself instead of an instance.
    • use "[Class Name] [Variable Name] = new [Class Name] ();" to create new object of the specified class
    • use period (.) after object variable to use its method
  • Extend
    • "extends" makes the class defined before it a subclass of the superclass (an already defined class you are extending) that is defined after "extends"
    • The subclass inherits all of the superclass's attributes