INHERITANCE AND POLYMORPHISM - Java Programming: From Problem Analysis to Program Design - page 645

public class Box extends Rectangle
{

private double height;

public Box()
{

//The definition is as given below

}

public Box( double l, double w, double h)
{

//The definition is as given below

}

public void setDimension( double l, double w, double h)
{

//Sets the length, width, and height of the box
//The definition is as given below

}

public double getHeight()
{

return height;

}

public double area()
{

//Returns the surface area
//The definition is as given below

}

public double volume()
{ 1

0

//Returns the volume
//The definition is as given below

}

public String toString()
{

//Returns length, width, and height of the box as
//a string. The definition is as given below.

}

}

Figure 10-3 shows the UML class diagram of the class Box and the inheritance
hierarchy.