Chapter 1 Basic concepts

1. 1 What is design pattern 2?

1.2 the role of design pattern 3

1.3 classification of grabbing mode 4

1.4 classification of design pattern 4

1.5 learning stage 6

Chapter 2 Responsibility Design Object-Grasp 9

2. 1 information expert 1 1

2.2 creator 13

2.3 low coupling (low coupling) 14

2.4 high cohesion15

2.5 controller 17

2.6 polymorphism (polymorphism) 18

2.7PureFabrication 19

2.8 Indirect (indirect) 20

2.9 Protected Variant (Protected Variant) 2 1

Chapter 3 GoF-Creative Design Patterns 23

3. 1 factory method mode 24

3. 1. 1 Definition 24

3. 1.2 Realistic example-Flag Factory 26

3. 1.3C# Example 1- Electronic Payment System 26

3. 1.4C# Example 2- School Login System 29

3. 1.5Java example-mobile phone simple factory 32

3. 1.6 Advantages and disadvantages 34

3. 1.7 Application Scenario 34

3.2FactoryMethodPattern (factory method mode) 35

3.2. 1 definition 35

3.2.2 Real example-Arsenal 36

3.2.3C# Example-Multi-document System 37

3.2.4Java example-expanding mobile phone factory 4 1

3.2.5 Advantages and Disadvantages 44

The application scenario

3.3 abstract factory (abstract factory) 45

3.3. 1 definition 45

3.3.2 Examples in Real Life-Expanded Arsenal 48

3.3.3C# Example-Continental Ecosystem 49

3.3.4Java instance-computer products 52

3.3.5 Advantages and disadvantages 57

The application scenario

3.4 builder mode (builder mode) 58

3.4. 1 definition 58

3.4.2 Real Example-Fast Food Restaurant 60

3.4.3C# Example-Workshop Automobile Manufacturing 6 1

3.4.4Java Example-Building a House 65

3.4.5 Advantages and disadvantages 69

The application scenario

3.5 Protocol Type Mode 70

3.5. 1 definition 70

3.5.2 Copy and paste 7 1

3.5.3C# Example-Color Manager 72

3.5.4Java Example-Simple Toolbar 74

Shallow copy and deep copy 76

3.5.6 Advantages and disadvantages 82

The application scenario

3.6 Single Mode 82

3.6. 1 Definition

Now 3.6.2? I don't know what to do, indowsTaskManager 83.

3.6.3C# Example-Load Balancing Controller 84

3.6.4Java instance-system log 86

3. 6. 5 Double Check Locking (Double Check Locking) 89

3.6.6 Advantages and Disadvantages 93

Application scenario 93

Chapter 4 GoF- Structured Design Pattern 95

4. 1 adapter mode 96

4. 1. 1 definition 96

4. 1.2 Real example-computer power adapter 97

4. 1.3C# Example-Chemical Database 98

4. 1.4Java example-cleaning system 102

4. 1.5 Advantages and disadvantages 104

4. 1.6 Application Scenario 104

4.2 Bridging Mode (Bridging Mode) 104

4.2. 1 definition 104

4.2.2 Examples in Reality-Men Dating 106

4.2.3C# Example-Business Object and Data Object 107

4.2.4Java example-image processing of different systems 1 12

4.2.5 Advantages and disadvantages 1 14

4.2.6 Application Scenario 1 15

4.3 compound mode (combination mode) 1 15

4.3. 1 Definition 1 15

4.3.2 Practical Application of Combination Mode-Resource Manager 1 17

4.3.3C# Example-Graph Tree Object Structure 1 18

4.3.4Java instance-document format 12 1

4.3.5 Advantages and disadvantages 124

4.3.6 Application Scenario 125

4.4 Decorative pattern (decorative pattern) 125

4.4. 1 definition 125

4.4.2 Decorative Patterns in Reality-Photo Frame 126

4.4.3C# Example-127 in the project library

4.4.4Java instance-custom JButton 13 1

4.4.5 Advantages and disadvantages 133

4.4.6 Application Scenario 134

4.5FacadePattern 134

4.5. 1 definition 134

4.5.2 Examples in Reality-Customer Service 135

4.5.3C# Example-Mortgage Application Review 136

4.5.4Java example-making tea 139

4.5.5 Advantages and disadvantages 143

4.5.6 Application Scenario 143

4.6FlyweightPattern 144

4.6. 1 Definition

4.6.2 Example-Guo Qi in the Middle Reaches of Guo Si 146

4.6.3C# Instance-Document Editor 147

4.6.4Java instance loading image 15 1

4.6.5 Advantages and disadvantages 154

4.6.6 Application Scenario 154

4.7 proxy mode (proxy mode) 154

Definition 154

4.7.2 Several Examples 156

4.7.3C# Example-Mathematical Agent 158

4.7.4Java Instance-Socket Echo 160

4.7.5 Advantages and disadvantages 165

4.7.6 Application Scenario 165

Chapter 5 GoF- Behavior Design Pattern 167

5. 1 responsibility chain (responsibility chain mode) 168

5. 1. 1 definition 168

5. 1.2 Real examples-the transmission of military information 169

5. 1.3C# Example-Purchase Classification Approval 170

5. 1.4Java example-intelligent building security system 174

5. 1.5 Advantages and disadvantages 178

5. 1.6 Application Scenario 178

5.2 command mode (command mode) 179

5.2. 1 definition 179

5.2.2 Example in Reality-Restaurant Reservation 180

5.2.3C# Example-Simple Calculator 18 1

5.2.4Java example-main switch 185

5.2.5 Advantages and disadvantages 189

5.2.6 Application Scenario 189

5.3 Interpreter mode 190

5.3. 1 definition 190

5.3.2 Real examples-music score 192

5.3.3C# Example-China Capital Conversion 192

5.3.4Java instance-custom program interpreter 197

5.3.5 Advantages and disadvantages 204

5.3.6 Application Scenario 205

5.4 Iterator Mode (Iterator Mode) 205

5.4. 1 definition 205

5.4.2 Real Example-TV Program Selector 206

5.4.3C# Example-Traversal Example 207

5.4.4Java instance-two iterators 2 1 1

5.4.5 Advantages and Disadvantages 2 13

5.4.6 Application Scenario 2 14

5.5 Intermediary Mode (Intermediary Mode) 2 14

Definition 2 14

5.5.2 Example-Airport Control Tower 2 15

5.5.3C# Example-Chatroom 2 16

5.5.4Java Example-Multithread Communication 220

5.5.5 Advantages and disadvantages 223

Application scenario 223

5.6 souvenir pattern (souvenir pattern) 223

5.6. 1 Definition

5.6.2 Real Example-Audio Equalizer 226

5.6.3C# Example-Sales Target 226

5.6.4Java instance-Undo operation 23 1

5.6.5 Advantages and disadvantages 236

Application scenario 236

5.7 Observation Mode 236

5.7. 1 definition 236

5.7.2 Real example-bin Laden appeared in 238

5.7.3C# Example-Cat and Mouse 238

5.7.4C# Example-Stock Change 24 1

Java example-monitoring system 245

5.7.6 Advantages and disadvantages 248

Application scenario 248

5.8 State Mode 248

5.8. 1 Definition

5.8.2 Real Example-Good Mood 250

5.8.3C# Example-Account Classification 250

5.8.4Java Example-Car Shift 258

5.8.5 Advantages and Disadvantages 26 1

5.8.6 Application Scenario 26 1

5.9 Strategic Mode 26 1

5.9. 1 definition261

5.9.2 Real-life example-the strategy of going to the airport 263

5.9.3C# Example-Sorting Method 263

5.9.4Java Instance-Multi-format Output 266

5.9.5 Advantages and Disadvantages 272

Application scenario 272

5. 10 template method mode (template method mode) 272

5. 1. 1 definition 272

5. 10.2 Reality Example-Chef Cooking 274

5. 10.3C# Example-Database Connection Template 274

5. 10.4Java example-bubble sorting template 277

5. 10.5 Advantages and disadvantages 280

5. 10.6 Application Scenario 280

5. 1 1 visitor mode 280

5. 1 1. 1 Definition 280

5. 1 1.2 Real Example-Cashier Cashier Invoicing 282

5. 1 1.3C# Example-Personnel Assessment 283

5. 1 1.4Java Example-Maintenance Engineer Inspects Vehicle 287

5. 1 1.5 Advantages and disadvantages 29 1

5. 1 1.6 Application status 29 1

Chapter VI Comprehensive Application of Model 293

6. 1Java instance extension recorder 294

6.2C# Example-Storage Analyzer 298

6.3 Using Schema to Generate Program Architecture 3 16

Appendix 1 self-test question 32 1

Appendix 2 Answers to Self-Test Questions 33 1

Reference 337