Java, A Beginner's Guide, 5th Edition, 5th Edition

Try This 7-1 Extending the Vehicle Class

TruckDemo.java

To illustrate the power of inheritance, we will extend the Vehicle class first developed in Chapter 4. As you should recall, Vehicle encapsulates information about vehicles, including the number of passengers they can carry, their fuel capacity, and their fuel consumption rate. We can use the Vehicle class as a starting point from which more specialized classes are developed. For example, one type of vehicle is a truck. An important attribute of a truck is its cargo capacity. Thus, to create a Truck class, you can extend Vehicle, adding an instance variable that stores the carrying capacity. Here is a version of Vehicle that does this. In the process, the instance variables in Vehicle will ...