ABSTRACT CLASSES AND INTERFACES - Introduction to Java Programming: Comprehensive Version - page 497

GeometricObject

Abstract class name is italicized

-color: String
-filled: boolean
-dateCreated: java.util.Date
#GeometricObject()
#GeometricObject(color: string,
filled: boolean)
+getColor(): String
+setColor(color: String): void
+isFilled(): boolean
+setFilled(filled: boolean): void
+getDateCreated(): java.util.Date
+toString(): String

The # sign indicates
protected modifier

+ getArea() : double
+ getPerimeter() : double

Abstract methods
are italicized

Methods getArea and getPerimeter are
overridden in Circle and Rectangle .
Superclass methods are generally omitted
in the UML diagram for subclasses.

Circle Rectangle

-radius: double -width: double

-height: double
+Rectangle()
+Rectangle(width: double, height: double)
+Rectangle(width: double, height: double,
color: string, filled: boolean)
+getWidth(): double
+setWidth(width: double): void
+getHeight(): double
+setHeight(height: double): void

+Circle()
+Circle(radius: double)

+Circle(radius: double, color: string,
filled: boolean)

+getRadius(): double
+setRadius(radius: double): void
+getDiameter(): double

F IGURE 13.1

The new GeometricObject class contains abstract methods.

21 }
22
23

/** Set a new color */

24 public void setColor(String color) {

25 this .color = color;

26 }
27
28

/** Return filled. Since filled is boolean,

29 * the get method is named isFilled */

30 public boolean isFilled() {

31 return filled;

32 }
33
34 /** Set a new filled */

35 public void setFilled( boolean filled) {

36 this .filled = filled;

37 }
38
39

/** Get dateCreated */

40 public java.util.Date getDateCreated() {

41 return dateCreated;

42 }