Add code

Unit-2/regularDonut.java

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+public class regularDonut extends donut {
+  private int width;
+  private int height;
+  private double zoom;
+  private double thickness;
+  
+  public regularDonut() {
+    this(22,80,1,40);
+  }
+
+  public regularDonut(int height, int width, double zoom, double thickness) {
+    super(height, width);
+    this.height = height;
+    this.width = width;
+    this.zoom = zoom;
+    this.thickness = thickness;
+  }
+
+  public void setZoom(double zoom) {
+    this.zoom = zoom;
+  }
+
+  public double getZoom() {
+    return this.zoom;
+  }
+
+  public void setThickness(double thickness) {
+    this.thickness = thickness;
+  }
+
+  public double getThickness() {
+    return this.thickness;
+  }
+  
+  public String toString() {
+    return this.render(zoom, thickness);
+  }
+}