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public abstract class Shape  {      private int x; private int y;      public abstract void draw();      public void setAnchor(int x, int y) {                  this.x = x;                  this.y = y;      }} Which two classes use the Shape class correctly? (Choose two.)Select one or more:a.public class Circle implements Shape  {        private int radius;}b.public class Circle extends Shape  {     private int radius;     public void draw();}c.public abstract class Circle extends Shape {       private int radius;}d.public class Circle extends Shape   {     private int radius;     public void draw() {/* code here */}}

Question

public abstract class Shape  {      private int x; private int y;      public abstract void draw();      public void setAnchor(int x, int y) {                  this.x = x;                  this.y = y;      }} Which two classes use the Shape class correctly? (Choose two.)Select one or more:a.public class Circle implements Shape  {        private int radius;}b.public class Circle extends Shape  {     private int radius;     public void draw();}c.public abstract class Circle extends Shape {       private int radius;}d.public class Circle extends Shape   {     private int radius;     public void draw() {/* code here */}}

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Solution

The correct answers are:

c. public abstract class Circle extends Shape { private int radius;}

d. public class Circle extends Shape { private int radius; public void draw() {/* code here */}}

Explanation:

Option a is incorrect because it uses 'implements' instead of 'extends'. In Java, 'implements' is used for interfaces, not abstract classes.

Option b is incorrect because it declares the method 'draw()' without providing a body. In Java, if you're not making the class abstract, you need to provide a body for all the methods of the superclass.

Option c is correct because it extends the abstract class 'Shape' and doesn't need to provide a body for the 'draw()' method since the 'Circle' class itself is declared as abstract.

Option d is correct because it extends the abstract class 'Shape' and provides a body for the abstract method 'draw()'.

This problem has been solved

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