Step 2: – Creation of the concrete classes which implement the Wrapping interface. Step 1: – Creation of an interface Product that represents the food and its wrapping. In the following example, we have demonstrated the above steps to explain the builder pattern in a very simple way. A BuilderPatternDemonstration class which will use the LunchMealBuilder class to build a LunchMeal and generate the final bill along with the GST charges.A LunchMealBuilder class to build different types of LunchMeal objects by combining products such as Veggie pizza with Mineral water, Veggie pizza with Soda drink, etc.A LunchMeal class that has an ArrayList of products.The classes which implement the Wrapping interface as pizza would be packed in wrapped package and drink would be packed as a drink glass.The concrete classes which implement the product and Wrapping interfaces.A Wrapping interface which represents packaging of the food items.A product interface which represents food products such as pizzas and drinks.We have to create the following classes and interfaces in order to prepare a Builder Pattern for this pizza restaurant. But later on four developers namely Erich Gamma, Richard Helm, John Vlissides, and Ralph Johnson wrote a book titled, Gang of Four-Design patterns, elements of reusable object-oriented software in the year 1995. Note: capacity should not be less than zero, otherwise it. Design patterns were first invented by Christopher Alexander in 1977. public StringBuilder (int capacity): creates a string builder with no characters and with specified capacity. Similarly, a served drink could be a mineral water or a soda drink packaged in a bottle or can. public StringBuilder (): creates a string builder with no characters and with default capacity 16 i.e. The documentation provides information regarding how the API retrieves the FDA product code information based upon the code. Further a served pizza could be a veggie pizza or a cheese pizza packaged in a wrapper. Welcome to the Product Code Builder (PCB) API Usage Documentation page. To understand the implementation of a builder pattern, lets take an example of a pizza restaurant that serves pizza and a drink as a lunch meal. In this pattern, the final object is built by a Builder class through a step by step approach that is independent of other objects. It falls under the category of creational design pattern as this pattern help us provide a common and very simple way to create a complex object from simple objects. In this chapter, we are going to discuss the Builder Pattern which is used to build a complex object from the simple objects through a step by step approach. In the last chapter, we discussed the Factory Pattern, which is one of the most commonly used design patterns in Java/J2EE.
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