Use 'super' constructors and parse negative circle radius.

lab-01/src/Circle.java

@@ -7,8 +7,8 @@ public class Circle extends _Point {
      * @param radius
      */
     public Circle(double radius){
-        this.radius = radius;
+        super();
-        this.setLocation(0, 0);
+        setRadius(radius);
     }
 
     /**
@@ -18,15 +18,20 @@ public class Circle extends _Point {
      * @param y
      */
     public Circle(double radius, int x, int y){
-        this.radius = radius;
+        super(x, y);
-        this.setLocation(x, y);
+        setRadius(radius);
     }
 
     /**
      * set radius
      * @param radius
      */
-    public void setRadius(double radius) { this.radius = radius; }
+    public void setRadius(double radius) {
+        //default to unit circle if bad radius is given.
+        //Maybe take abs(r) to negate negative radius.
+        if (radius < 0) { this.radius = 1; }
+        else this.radius = radius;
+    }
 
     /**
      * get radius

lab-01/src/Cylinder.java

@@ -8,7 +8,7 @@ public class Cylinder extends Circle {
      * @param h height
      */
     public Cylinder(double r, double h){
-        super(r);//Recommended by IDE. Invokes Circle(double radius).
+        super(r);
         // Circle with location 0, 0 and radius r.
         this.height = h;
         //now a cylinder with radius r and height h at 0,0

lab-01/src/_Rectangle.java

@@ -9,9 +9,9 @@ public class _Rectangle extends _Point {
      * @param height height of rectangle
      */
     public _Rectangle(double width, double height){
+        super();// This might be useless.
         this.height = height;
         this.width = width;
-        this.setLocation(0, 0);
     }
 
     /**
@@ -22,9 +22,9 @@ public class _Rectangle extends _Point {
      * @param h height of rectangle
      */
     public _Rectangle(int x, int y, double w, double h){
+        super(x, y);
         this.width = w;
         this.height = h;
-        this.setLocation(x, y);
     }
 
     /**