Hands-On Design Patterns with Java

Programming the design pattern

The Lot class shown here only contains two variables that can be used to calculate the square footage land area of instances of the Lot class:

public class Lot {    // class variables    public double length;    public double width;}

The Estate class contains the same two variables as the Lot class and also contains a constructor method:

public class Estate {    // class variables    public double length;    public double width;    // constructor    public Estate(int length, int width) {        this.length = length;        this.width = width;    }}

The AcreageDeterminator class is used to compute the square footage of a Lot instance:

public class AcreageDeterminator {    Lot lot;    public double determineAcreage(Lot tLot) {        lot = tLot;        return lot.length ...