OReilly.Head.First.Design.Patterns.2004.pdf

Chapter 1. Welcome to Design Patterns

Table of Contents

Chapter 1. Welcome to Design Patterns. ...................................................... 1

Section 1.1. It started with a simple SimUDuck app ....................................................................................................................... 2

Section 1.2. But now we need the ducks to FLY ............................................................................................................................. 3

Section 1.3. But something went horribly wrong.... ....................................................................................................................... 4

Section 1.4. Joe thinks about inheritance... .................................................................................................................................... 5

Section 1.5. Sharpen your pencil ..................................................................................................................................................... 5

Section 1.6. How about an interface? ............................................................................................................................................. 6

Section 1.7. What would you do if you were Joe? ........................................................................................................................... 7

Section 1.8. The one constant in software development ................................................................................................................ 8

Section 1.9. Sharpen your pencil .................................................................................................................................................... 8

Section 1.10. Zeroing in on the problem... ...................................................................................................................................... 9

Section 1.11. Separating what changes from what stays the same ............................................................................................... 10

Section 1.12. Designing the Duck Behaviors .................................................................................................................................. 11

Section 1.13. Implementing the Duck Behaviors .......................................................................................................................... 13

Section 1.14. There are no Dumb Questions ................................................................................................................................. 14

Section 1.15. Sharpen your pencil .................................................................................................................................................. 14

Section 1.16. Integrating the Duck Behavior ................................................................................................................................. 15

Section 1.17. More Integration... ................................................................................................................................................... 16

Section 1.18. Testing the Duck code .............................................................................................................................................. 18

Section 1.19. Setting behavior dynamically. ................................................................................................................................. 20

Section 1.20. The Big Picture on encapsulated behaviors ............................................................................................................ 22

Section 1.21. HAS-A can be better than IS-A ................................................................................................................................ 23

Section 1.22. Speaking of Design Patterns... ................................................................................................................................ 24

Section 1.23. Design Puzzle ........................................................................................................................................................... 25

Section 1.24. Overheard at the local diner... ................................................................................................................................. 26

Section 1.25. Overheard in the next cubicle... ............................................................................................................................... 27

Section 1.26. The power of a shared pattern vocabulary ............................................................................................................. 28

Section 1.27. How do I use Design Patterns? ............................................................................................................................... 29

Section 1.28. There are no Dumb Questions. ............................................................................................................................... 29

Section 1.29. Skeptical Developer-Friendly Patterns Guru ......................................................................................................... 30

Section 1.30. Tools for your Design Toolbox ................................................................................................................................ 32

Section 1.31. Design Puzzle Solution ............................................................................................................................................ 34

Section 1.32. Solutions .................................................................................................................................................................. 35

Chapter 1. Welcome to Design Patterns

Head First Design Patterns By Eric Freeman, Elisabeth Freeman, Bert Bates, Kathy Sierra

ISBN: 0596007124 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

Chapter 1. Welcome to Design Patterns Page 1

Return to Table of Contents

Intro to Design Patterns

:HOFRPHWR

'HVLJQ3DWWHUQV

1RZWKDWZH·UHOLYLQJ

LQ2EMHFWYLOOHZH·YHMXVWJRW

WRJHWLQWR'HVLJQ3DWWHUQV

HYHU\RQHLVGRLQJWKHP6RRQ

ZH·OOEHWKHKLWRI-LPDQG

%HWW\·V:HGQHVGD\QLJKW

SDWWHUQVJURXS

6RPHRQHKDVDOUHDG\VROYHG\RXUSUREOHPV ,QWKLVFKDSWHU\RX¶OOOHDUQ

ZK\DQGKRZ\RXFDQH[SORLWWKHZLVGRPDQGOHVVRQVOHDUQHGE\RWKHUGHYHORSHUVZKR¶YH

EHHQGRZQWKHVDPHGHVLJQSUREOHPURDGDQGVXUYLYHGWKHWULS%HIRUHZH¶UHGRQHZH¶OO

ORRNDWWKHXVHDQGEHQH¿WVRIGHVLJQSDWWHUQVORRNDWVRPHNH\22GHVLJQSULQFLSOHVDQG

ZDONWKURXJKDQH[DPSOHRIKRZRQHSDWWHUQZRUNV7KHEHVWZD\WRXVHSDWWHUQVLVWR ORDG

\RXUEUDLQ ZLWKWKHPDQGWKHQ UHFRJQL]HSODFHV LQ\RXUGHVLJQVDQGH[LVWLQJDSSOLFDWLRQV

ZKHUH\RXFDQ DSSO\WKHP ,QVWHDGRI FRGH UHXVHZLWKSDWWHUQV\RXJHW H[SHULHQFH UHXVH

WKLVLVDQHZFKDSWHU

Chapter 1. Welcome to Design Patterns

Head First Design Patterns By Eric Freeman, Elisabeth Freeman, Bert Bates, Kathy Sierra

ISBN: 0596007124 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

Chapter 1. Welcome to Design Patterns Page 2

Return to Table of Contents

6LP8'XFN

1\[\IZ\ML_Q\PI[QUXTM;QU=,]KSIXX

2WM_WZS[NWZIKWUXIVa\PI\UISM[IPQOPTa[]KKM[[N]TL]KSXWVL

[QU]TI\QWVOIUM ;QU=,]KS <PMOIUMKIV[PW_ITIZOM^IZQM\aWN

L]KS[XMKQM[[_QUUQVOIVLUISQVOY]IKSQVO[W]VL[<PMQVQ\QIT

LM[QOVMZ[WN\PM[a[\MU][ML[\IVLIZL77\MKPVQY]M[IVLKZMI\ML

WVM,]KS[]XMZKTI[[NZWU_PQKPITTW\PMZL]KS\aXM[QVPMZQ\

'XFN

$OOGXFNV TXDFNDQGVZLPWKH

VXSHUFODVVWDNHVFDUHRIW KH

LPSOHPHQWDWLRQFRGH

TXDFN

VZLP

GLVSOD\

27+(5GXFNOLNHPHWKRGV

0DOODUG'XFN

5HGKHDG'XFN

GLVSOD\^

ORRNVOLNHDPDOODUG`

GLVSOD\^

ORRNVOLNHDUHGKHDG`

1V\PMTI[\aMIZ\PMKWUXIVaPI[JMMV]VLMZQVKZMI[QVOXZM[[]ZM

NZWUKWUXM\Q\WZ[)N\MZI_MMSTWVOWNN[Q\MJZIQV[\WZUQVO

[M[[QWVW^MZOWTN\PMKWUXIVaM`MK]\Q^M[\PQVSQ\¼[\QUMNWZIJQO

QVVW^I\QWV<PMaVMML[WUM\PQVO ZMITTa QUXZM[[Q^M\W[PW_I\\PM

]XKWUQVO[PIZMPWTLMZ[UMM\QVOQV5I]Q VM`\_MMS

&KDSWHU

Chapter 1. Welcome to Design Patterns

Head First Design Patterns By Eric Freeman, Elisabeth Freeman, Bert Bates, Kathy Sierra

ISBN: 0596007124 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

Chapter 1. Welcome to Design Patterns Page 3

Return to Table of Contents

LQWUR WR 'HVLJQ3DWWHUQV

*]\VW__MVMML\PML]KS[\W.4A

<PMM`MK]\Q^M[LMKQLML\PI\ÆaQVOL]KS[Q[R][\_PI\\PM

[QU]TI\WZVMML[\WJTW_I_Ia\PMW\PMZL]KS[QUKWUXM\Q\WZ[

)VLWNKW]Z[M2WM¼[UIVIOMZ\WTL\PMUQ\¼TTJMVWXZWJTMU

NWZ2WM\WR][\_PQX[WUM\PQVO]XQVI_MMS¹)N\MZITTº[IQL

2WM¼[JW[[¹PM¼[IV77XZWOZIUUMZ PW_PIZLKIVQ\JM'º

,MXVWQHHGWRDGGDÁ\

PHWKRGLQWKH'XFNFODVVDQG

WKHQDOOWKHGXFNVZLOOLQKHULWLW

1RZ·VP\WLPHWRUHDOO\VKRZP\

WUXH22JHQLXV

-RH

:KDWZHZDQW

'XFN

TXDFN

VZLP

GLVSOD\

IO\

27+(5GXFNOLNHPHWKRGV

0DOODUG'XFN

5HGKHDG'XFN

GLVSOD\^

ORRNVOLNHDPDOODUG`

GLVSOD\^

ORRNVOLNHDUHGKHDG`

\RXDUHKHUH

Chapter 1. Welcome to Design Patterns

Head First Design Patterns By Eric Freeman, Elisabeth Freeman, Bert Bates, Kathy Sierra

ISBN: 0596007124 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: