What does the following code do? The first code listing contains the declaration of class Shape. Each Shape object represents a closed shape with a number of sides (a closed shape must have three or more sides). The second code listing contains a method (mystery) declared by a client of class Shape. What does this method do?

Question

```
1 public class Shape
2 {
3 // integer for storing number of sides
4 private int sides;
5
6 // Shape constructor, number of sides supplied
7 public Shape( int numSides )
8 {
9 setSides( numSides );
10
11 } // end constructor
12
13 // return sides value
14 public int getSides()
15 {
16 return sides;
17
18 } // end method getSides
19
20 // set sides value
21 public void setSides( int numSides )
22 {
23 if ( numSides > 2 )
24 {
25 sides = numSides;
26 }
27 else // set invalid input to 0
28 {
29 sides = 0;
30 }
31
32 } // end method setSides
33
34 } // end class Shape
```
```
1 public String mystery( Shape shape)
2 {
3 String shapeText;
4
5 // switch with number of shape’s sides
6 switch ( shape.getSides() )
7 {
8 case 3:
9 shapeText = "Triangle";
10 break;
11
12 case 4:
1 public String mystery( Shape shape)
2 {
3 String shapeText;
4
5 // switch with number of shape’s sides
6 switch ( shape.getSides() )
7 {
8 case 3:
9 shapeText = "Triangle";
10 break;
11
12 case 4:
13 shapeText = "Quadrilateral";
14 break;
15
16 default:
17 shapeText = "Other polygon";
18
19 } // end switch
20
21 return shapeText;
22
23 } // end method mystery
```

Answer 1

Method mystery returns a String containing text indicating what type of shape the Shape object passed to it is. Method mystery will determine whether the Shape object is a triangle, quadrilateral or other polygon by the number of sides the Shape object has.