Design Poker Java
A design patterns are well-proved solution for solving the specific problem/task.
Now, a question will be arising in your mind what kind of specific problem? Let me explain by taking an example.
Java programming using arrays. Design a program to simulate a poker game which is drawing cards from a shuffled deck of poker. There are 52 poker cards in a single deck. After shuffle the deck, you need to simulate drawing the first 4 cards from the top of this deck. A BusinessObject may be implemented as a session bean, entity bean or some other Java object in addition to a servlet or helper bean that accesses the data source. DataAccessObject: The DataAccessObject is the primary object of this pattern. This is a set of poker size playing cards which has been hand crafted in a standard Vector Format (.SVG). All 52 faces are offered in one file as separate objects that can easily be cut/pasted/exported singly as desired. These are licensed under LPGL 3.0. Order matters in Java; you can't expect the compiler to know what the suit means and what the value means just by variable names. Also, inside deal(int numCards), you call deal(5). That's going to keep calling itself over and over again forever until the computer runs out of memory. (This is called recursion, and it's very tricky to use correctly.
Problem Given:
Suppose you want to create a class for which only a single instance (or object) should be created and that single object can be used by all other classes.
Solution:
Singleton design pattern is the best solution of above specific problem. So, every design pattern has some specification or set of rules for solving the problems. What are those specifications, you will see later in the types of design patterns.
But remember one-thing, design patterns are programming language independent strategies for solving the common object-oriented design problems. That means, a design pattern represents an idea, not a particular implementation.
By using the design patterns you can make your code more flexible, reusable and maintainable. It is the most important part because java internally follows design patterns.
To become a professional software developer, you must know at least some popular solutions (i.e. design patterns) to the coding problems.
Advantage of design pattern:
- They are reusable in multiple projects.
- They provide the solutions that help to define the system architecture.
- They capture the software engineering experiences.
- They provide transparency to the design of an application.
- They are well-proved and testified solutions since they have been built upon the knowledge and experience of expert software developers.
- Design patterns don?t guarantee an absolute solution to a problem. They provide clarity to the system architecture and the possibility of building a better system.
When should we use the design patterns?
Design Poker Java Game
We must use the design patterns during the analysis and requirement phase of SDLC(Software Development Life Cycle).
Design patterns ease the analysis and requirement phase of SDLC by providing information based on prior hands-on experiences.
Categorization of design patterns:
Basically, design patterns are categorized into two parts:
- Core Java (or JSE) Design Patterns.
- JEE Design Patterns.
Core Java Design Patterns
In core java, there are mainly three types of design patterns, which are further divided into their sub-parts:
1.Creational Design Pattern
- Factory Pattern
- Abstract Factory Pattern
- Singleton Pattern
- Prototype Pattern
- Builder Pattern.
2. Structural Design Pattern
- Adapter Pattern
- Bridge Pattern
- Composite Pattern
- Decorator Pattern
- Facade Pattern
- Flyweight Pattern
- Proxy Pattern
3. Behavioral Design Pattern
- Chain Of Responsibility Pattern
- Command Pattern
- Interpreter Pattern
- Iterator Pattern
- Mediator Pattern
- Memento Pattern
- Observer Pattern
- State Pattern
- Strategy Pattern
- Template Pattern
- Visitor Pattern
Design Patterns Index
Design Patterns Tutorial
1) Creational Pattern
2) Structural Pattern
3) Behavioral Pattern
Do you know?
- Christopher Alexander was the first person who invented all the above Design Patterns in 1977.
- But later the Gang of Four - Design patterns, elements of reusable object-oriented software book was written by a group of four persons named as Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides in 1995.
- That's why all the above 23 Design Patterns are known as Gang of Four (GoF) Design Patterns.