Computational Problem Solving with Java and Interactive Object Graphics

public void onPressed(Shape shp, double, x, double y, int button) {
    System.out.println("The mouse was pressed at coordinates (" 
                        + x + "," + y + ")");
}

myOval.setMousePressedHandler( this::onPress );

// ToggleButton.java
import doodlepad.*;

// ToggleButton class
public class ToggleButton {
  private RoundRect shpButton;  // Button Shape
  private boolean on;           // Button state

  // Constructor
  public ToggleButton() {
    // Create button shape and initialize
    shpButton = new RoundRect(100, 100, 75, 50, 20, 20);

    on = false;                 // Starts off
    shpButton.setFillColor(200);

    // Set button click event handler method
    shpButton.setMousePressedHandler(this::onPressed);
  }
  // Handle mouse-pressed event
  private void onPressed(Shape shp, double x, double y, int button) {
    toggle();
  }
  // Toggle button
  public void toggle() {
    on = !on;               // Flip state
    if (on) {               // Update graphic 
      shpButton.setFillColor(0, 255, 0);
    } else {
      shpButton.setFillColor(200);
    }
  }

  public static void main(String[] args) {
  // Create a new ToggleButton
    ToggleButton myButton = new ToggleButton();
  }
}

// BoxDriver.java
import doodlepad.*;

public class BoxDriver
{
    // The box to drive around the Pad
    private Rectangle box;

    public BoxDriver() {
        // Explicitly create a Pad and handle key-pressed event
        Pad p = new Pad(600, 600);
        p.setKeyPressedHandler( this::onKeyPressed );

        // Create ans style the box to drive
        box = new Rectangle(100, 100, 50, 50);
        box.setFillColor(0, 0, 255);
    }

    // Key pressed event handler moves box according key pressed
    public void onKeyPressed(Pad p, String keyText, String keyMods) {
        if (keyText.equals("Left") || keyText.equals("←")) {
            box.move(-10, 0);
        } else if (keyText.equals("Right") || keyText.equals("→")) {
            box.move(10, 0);
        } else if (keyText.equals("Up") || keyText.equals("↑")) {
            box.move(0, -10);
        } else if (keyText.equals("Down") || keyText.equals("↓")) {
            box.move(0, 10);
        }
    }

    public static void main(String[] args) {
        BoxDriver myBoxDriver = new BoxDriver();
    }
}