The document discusses design patterns, which are templates for solving common programming problems. It provides examples of different categories of design patterns, including creational (e.g. factory method), structural (e.g. adapter), and behavioral (e.g. observer, command). For each pattern, it describes the problem it addresses and provides a high-level overview of the solution approach. Specific patterns like singleton, factory, facade, adapter, observer, and command are explained in more detail with illustrations.

1. DESIGN PATTERN

2. Apa itu Design Pattern ??
•
Design pattern adalah solusi yang digunakan
untuk menyelesaikan masalah-masalah umum
yang ditemukan dalam design perangkat lunak.
•
Design pattern berupa template
•
Design pattern bukan termasuk algoritma

3. Jenis-jenis Design Pattern
• Creational Patterns:
1. Abstract Factory
2. Builder
3.
Factory Method
4.
Prototype
5.
Singleton

4. Jenis-jenis Design Pattern(cont.)
•
Structural Patterns:
1.
Adapter
2.
3.
4.
Bridge
Composite
Decorator
5.
Facade
6.
7.
Flyweight
Proxy

5. Jenis-jenis Design Pattern(cont.)
• Behavioral Patterns:
1. Chain of Responsbility
2.
Command
3.
4.
5.
6.
Interpreter
Iterator
Mediator
Mementto
7.
Observer
8.
9.
10.
11.
State
Strategy
Template Method
Visitor

6. Singleton Design Pattern
Singleton artinya satu class
hanya boleh mempunyai
satu instance selama
aplikasi berjalan

7. Singleton Pattern (problem)

8. Singleton Pattern(problem)

9. Singleton Pattern

10. Singleton Pattern

11. Factory Pattern
When we use it?
• When our object or component setup involves a
high level of complexity
• When we need to easily generate different
instances of objects depending on the environment
we are in
• When we're working with many small objects or
components that share the same properties
• When composing objects with instances of other
objects that need only satisfy an API contract (aka,
duck typing) to work. This is useful for decoupling.

12. Factory Pattern

13. Factory Pattern
Problem

14. Factory Pattern
Solution

15. Facade Pattern
Adalah objek yang menyediakan
interface yang telah sederhana dari
deretan kode yang sangat besar

16. Facade Pattern (Problem)

17. Facade Pattern

18. Adapter Design Pattern
Intinya menyederhanakan interface

19. Adapter Pattern (problem)
postToW
all

20. Adapter Pattern

21. Adapter Pattern

22. Observer Pattern
Konsep Utama dari Obserever Pattern adalah saat terdapat
kelas tertentu (Observer) yang perlu mengetahui aktifitas
dari kelas lain (Subject)

23. Observer Pattern
Observer

24. Command Pattern
Subject

25. Observer Pattern
client

26. Command Pattern
Intent
• Encapsulate a request in an object
• Allows the parameterization of clients with
different requests
• Allows saving the requests in a queue

27. Command Pattern
Implementation

28. Command Pattern