Thinking in Patterns with Java - Tutok, 2003.pdf - Design Patterns - Ryjufka

with Java

Bruce Eckel

President, MindView, Inc.

Revision 0.5a

Please note that this document is in its initial form, and much remains to

be done. Corrections and comments should go to

http://www.topica.com/lists/TIPatterns/

Contents

Preface

Introduction

1: The pattern concept 11

What is a pattern? .............. 11

Pattern taxonomy............... 13

The singleton ...................... 14

Classifying patterns........... 15

The development challenge17

Exercises .............................. 17

2: Unit Testing 19

Write tests first ................... 20

A very simple framework. 21

Writing tests ....................... 23

White-box & black-box tests26

Running tests...................... 28

Automatically executing tests

Exercises .............................. 31

3: Building application frameworks

Template method............... 33

4:Fronting for an implementation

Proxy.................................... 36

State...................................... 37

StateMachine ...................... 40

Tools..................................... 47

Exercises .............................. 47

X: Iterators: decoupling algorithms from containers

Type-safe iterators ............. 50

5: Factories: encapsulating object creation

Simple Factory method ..... 54

Polymorphic factories........ 56

Abstract factories................ 59

Exercises .............................. 62

6: Function objects 63

Command ............................ 63

Strategy ................................ 65

Chain of responsibility ...... 67

Exercises .............................. 69

7: Changing the interface 71

Adapter ................................ 71

Façade .................................. 73

Package as a variation of Façade .. 74

Exercises .............................. 75

8: Table-driven code: configuration flexibility

Table-driven code using anonymous inner classes 77

9: Interpreter/ Multiple Languages

Interpreter............................ 80

Motivation ........................... 80

Python overview ................ 81

Built-in containers ......................... 82

Functions ........................................ 83

Strings ............................................. 84

Classes............................................. 85

Creating a language ........... 89

Configuring Jython ....................... 93

Generating documentation93

Controlling the interpreter 94

Putting data in ............................... 94

Getting data out........................... 100

Multiple interpreters ................... 103

Controlling Java from Jython104

Using Java libraries .......... 108

Inheriting from Java library classes110

Creating Java classes with Jython 111

Building the Java classes from the Python code

116

Summary ........................... 117

Exercises ............................ 118

10: Callbacks 119

Observer ............................ 119

Observing flowers ....................... 121

A visual example of observers

125

Exercises ............................ 128

11: Multiple dispatching 129

Visitor, a type of multiple dispatching

132

Exercises ............................ 135

12: Pattern refactoring 137

Simulating the trash recycler137

Improving the design...... 141

“Make more objects”................... 142

A pattern for prototyping creation 145

Trash subclasses .......................... 150

Parsing Trash from an external file151

Recycling with prototyping ....... 155

Abstracting usage ............ 156

Multiple dispatching ....... 161

Implementing the double dispatch162

The Visitor pattern ........... 169

A Reflective Decorator................ 172

More coupling? ............................ 178

RTTI considered harmful?178

Summary ........................... 181

Exercises ............................ 183

13: Projects 184

Rats & Mazes .................... 184

Other maze resources.................. 189

XML Decorator................. 189

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