To answer this question, we need to understand the concept of inheritance and how it is applied in Java.
The given code snippet defines an abstract class named "Shape" with private instance variables "x" and "y" and an abstract method "draw()". It also includes a non-abstract method "setAnchor(int x, int y)" that sets the values of "x" and "y".
Now, let's go through each option to understand why it is correct or incorrect:
Option A) public class Circle implements Shape { private int radius; } - This option is incorrect because the class "Circle" is implementing the "Shape" interface, but it does not provide an implementation for the abstract method "draw()".
Option B) public abstract class Circle extends Shape { private int radius; } - This option is correct because the class "Circle" extends the "Shape" abstract class and provides an implementation for the abstract method "draw()". It also defines a private instance variable "radius".
Option C) public class Circle extends Shape { } - This option is correct because the class "Circle" extends the "Shape" abstract class and provides an implementation for the abstract method "draw()".
Option D) public abstract class Circle implements Shape { } - This option is incorrect because the class "Circle" is implementing the "Shape" interface, but it does not provide an implementation for the abstract method "draw()".
Therefore, the correct answers are B and C. These options correctly use the Shape class by extending it and providing an implementation for the abstract method "draw()".