Hands-On Design Patterns with Java

Programming the design pattern

We will consider the following case to understand the programming design pattern:

1. Our Mattress Manufacturing Factory Demo project starts with a MattressInterface interface. That interface contains a print() method with no body:

public interface MattressInterface {    void print();}

2. The Mattress class implements MattressInterface. It contains two class variables (mattressSize and mattressFirmness). The class also contains the setMattressFirmness() mutator method and overrides the interface's print() method:

public class Mattress implements MattressInterface {        // class variables    String matrressSize;    public String mattressFirmness;    // constructor    public Mattress(String matrressSize) {        this.matrressSize = matrressSize; ...