2014 達暉資訊教育訓練課程 - Design Patterns 課程簡介： 蛇麼！居然可以～ 行雲流水般回答何謂 觀察者模式 而不是 我認識它 但無法完整說出它是誰 看完整本 設計模式 書籍 而不是 三秒就倒頭入睡？ 寫出 一段段自己滿意程式 而不是 質疑是否有更好寫法 其實 “Design Patterns” 並沒有這麼困難，這次的課程，我們會透過情境的方式，帶大家慢慢走入這個世界～

1. Design
Patterns
© 2014 Luster

2. Me

3. Reference
啓

4. Object
Oriented
Basic

5. ⽤用情境，學設計模式

8. Class Diagram
MallardDuck
display() { }
swim()
quack()
RedheadDuck
display() { }
swim()
quack()

9. Class Diagram
MallardDuck
display() { }
swim()
quack()
RedheadDuck
display() { }
swim()
quack()
Duck

10. Class Diagram
MallardDuck
display() { } display() { }
RedheadDuck
Duck
swim()
quack()

11. Class Diagram
MallardDuck
display() { } display() { }
RedheadDuck
Duck
swim()
quack()
display()

12. Class Diagram
MallardDuck
display() { } display() { }
RedheadDuck
Duck
swim()
quack()
display()

14. 模擬鴨子，全 改版
讓鴨子飛新

15. “
”

16. MallardDuck
display() { }
Duck
quack()
display()
swim()
RedheadDuck
display() { }
Class Diagram

17. MallardDuck
display() { }
Duck
quack()
display()
swim()
RedheadDuck
display() { }
fly()
Jason’s Class Diagram

18. 公測那一天
黃色塑膠鴨竟然也會飛了－ －|||

20. What’s happened ?
Duck
quack()
display()
swim()
fly()
RubberDuck
quack() { 吱吱叫; }
@Override
display() { }

22. Duck
quack()
display()
swim()
fly()
RubberDuck
display() { }
quack() { 吱吱叫; }
@Override
“
”

23. Jason’s Class Diagram II
Duck
quack()
display()
swim()
fly()
RubberDuck
quack() { 吱吱叫; }
@Override
display() { }
fly() { // Do nothing! }
@Override

24. “
”
FireDuck
quack() { // Do nothing! }
@Override
display() { }
fly() { // Do nothing! }
@Override
swim() { // Do nothing! }
@Override

25. A.
B.
C.
D.
E.
F.

26. “ ”
“ ”
“ ”

27. 而且又繼續用繼承的方式，那我豈不是要

28. 逐鴨審查
而且又繼續用繼承的方式，那我豈不是要

29. “
”

30. Duck
display()
swim()Flyable
fly()
Quackable
quack()
MallardDuck RedheadDuck RubberDuck
“
”

31. Duck
display()
swim()Flyable
fly()
Quackable
quack()
MallardDuck
display()
RedheadDuck
display()
RubberDuck
display()
“
”

32. Duck
display()
swim()Flyable
fly()
Quackable
quack()
MallardDuck
fly()
display()
RedheadDuck
fly()
display()
RubberDuck
display()
“
”

33. Duck
display()
swim()Flyable
fly()
Quackable
quack()
MallardDuck
fly()
display()
quack()
RedheadDuck
fly()
display()
quack()
RubberDuck
display()
quack()
“
”

34. Duck
display()
swim()Flyable
fly()
Quackable
quack()
MallardDuck
display()
RedheadDuck
display()
RubberDuck
display()
“
”
fly()
quack()
fly()
quack()
quack()

36. 設計守則
Design Principle

37. 1

44. 1

45. 2

46. Program to an !
interface,!
not an implementation.
2

48. Example
Soldier
attack()
Sniper
attack() {!
! snipe();!
}
snipe()
Stormtrooper
attack() {!
! shoot();!
}
shoot()

49. Program to an implement
Sniper soldier = new Sniper();
soldier.attack();

50. Program to an interface
Sniper soldier = new Sniper();
soldier.attack();
Soldier soldier = new Sniper();
soldier.attack();

51. Sniper soldier = new Sniper();
soldier.attack();
Soldier soldier = new Sniper();
soldier.attack();
Soldier soldier = getSoldier();
soldier.attack();
Program to an interface

53. QuackBehavior
quack()
<< interface >>
FlyBehavior
fly()
<< interface >>

54. QuackBehavior
quack()
<< interface >>
FlyBehavior
fly()
<< interface >>
Squeak
quack() { 吱吱叫; }
MuteQuack
quack() { 不會叫; }
Quack
quack() { 呱呱叫; }
FlyWithWings
fly() { ⽤用翅膀飛; }
FlyWithRocket
fly() { ⽤用⽕火箭飛; }
FlyNoWay
fly() { 不會飛; }

55. Duck
display()
swim()

56. Duck
display()
swim()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
}

57. Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
!
public void performQuack() {
quackBehavior.quack();
}
public void performFly() {…}
}

58. Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
!
public void performQuack() {
!
}
public void performFly() {…}
}
quackBehavior.quack();

59. public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
!
public void performQuack() {
quackBehavior.quack();
}
public void performFly() {…}
}

60. public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
!
public void performQuack() {
quackBehavior.quack();
}
public void performFly() {…}
}
public class MallardDuck extends Duck {
!
public MallardDuck() {
quackBehavior = new Quack();
flyBehavior = new FlyWithNoWings();
}
!
public void display() {…}
}

62. public class DuckSimulator {
!
public static void main(String[] args) {
Duck mallard = new MallardDuck();
mallard.performQuack();
}
}

63. public class DuckSimulator {
!
public static void main(String[] args) {
Duck mallard = new MallardDuck();
mallard.performQuack();
}
}

65. Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
!
public void performQuack() {
quackBehavior.quack();
}
public void performFly() {…}
!
}

66. public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
!
public void performQuack() {
quackBehavior.quack();
}
public void performFly() {…}
!
}
Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
setQuackBehavior()
setFlyBehavior()

67. Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
setQuackBehavior()
setFlyBehavior()
public abstract class Duck {
QuackBehavior quackBehavior;
FlyBehavior flyBehavior;
!
public void performQuack() {
quackBehavior.quack();
}
public void performFly() {…}
!
public void setQuackBehavior(
QuackBehavior behavior) {
this.quackBehavior = behavior;
}
public void setFlyBehavior…
}

69. public class DuckSimulator {
!
public static void main(String[] args) {
Duck mallard = new MallardDuck();
mallard.performQuack();
mallard.setQuackBehavior(new Squeak());
mallard.performQuack();
}
}

70. public class DuckSimulator {
!
public static void main(String[] args) {
Duck mallard = new MallardDuck();
mallard.performQuack();
mallard.setQuackBehavior(new Squeak());
mallard.performQuack();
}
}

71. public class DuckSimulator {
!
public static void main(String[] args) {
Duck mallard = new MallardDuck();
mallard.performQuack();
mallard.setQuackBehavior(new Squeak());
mallard.performQuack();
}
}

73. QuackBehavior
quack()
<< interface >>
Quack
quack() { 呱; }
MuteQuack
quack() {}
Squeak
quack() { 吱; }
FlyBehavior
fly()
<< interface >>
FlyWithWings
fly() { 拍翅膀; }
FlyNoWay
fly() {}
FlyWithRocket
fly() { 噴射; }

74. Duck QuackBehavior
quack()
<< interface >>
Quack
quack() { 呱; }
MuteQuack
quack() {}
Squeak
quack() { 吱; }
FlyBehavior
fly()
<< interface >>
FlyWithWings
fly() { 拍翅膀; }
FlyNoWay
fly() {}
FlyWithRocket
fly() { 噴射; }
MallardDuck
display()
swim()
RedheadDuck
display()
swim()
RubberDuck
display()
swim()

75. QuackBehavior
quack()
<< interface >>
Quack
quack() { 呱; }
MuteQuack
quack() {}
Squeak
quack() { 吱; }
FlyBehavior
fly()
<< interface >>
FlyWithWings
fly() { 拍翅膀; }
FlyNoWay
fly() {}
FlyWithRocket
fly() { 噴射; }
MallardDuck
display()
RedheadDuck
display()
RubberDuck
display()
Duck
display()
swim()

76. Duck
display()
swim()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
QuackBehavior
quack()
<< interface >>
Quack
quack() { 呱; }
MuteQuack
quack() {}
Squeak
quack() { 吱; }
FlyBehavior
fly()
<< interface >>
FlyWithWings
fly() { 拍翅膀; }
FlyNoWay
fly() {}
FlyWithRocket
fly() { 噴射; }
MallardDuck
display()
RedheadDuck
display()
RubberDuck
display()

77. Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
QuackBehavior
quack()
<< interface >>
Quack
quack() { 呱; }
MuteQuack
quack() {}
Squeak
quack() { 吱; }
FlyBehavior
fly()
<< interface >>
FlyWithWings
fly() { 拍翅膀; }
FlyNoWay
fly() {}
FlyWithRocket
fly() { 噴射; }
MallardDuck
display()
RedheadDuck
display()
RubberDuck
display()

78. Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
setQuackBehavior()
setFlyBehavior()
QuackBehavior
quack()
<< interface >>
Quack
quack() { 呱; }
MuteQuack
quack() {}
Squeak
quack() { 吱; }
FlyBehavior
fly()
<< interface >>
FlyWithWings
fly() { 拍翅膀; }
FlyNoWay
fly() {}
FlyWithRocket
fly() { 噴射; }
MallardDuck
display()
RedheadDuck
display()
RubberDuck
display()

79. Duck
display()
swim()
performQuack()
performFly()
QuackBehavior quackBehavior
FlyBehavior flyBehavior
setQuackBehavior()
setFlyBehavior()
QuackBehavior
quack()
<< interface >>
Quack
quack() { 呱; }
MuteQuack
quack() {}
Squeak
quack() { 吱; }
FlyBehavior
fly()
<< interface >>
FlyWithWings
fly() { 拍翅膀; }
FlyNoWay
fly() {}
FlyWithRocket
fly() { 噴射; }
MallardDuck
display()
RedheadDuck
display()
RubberDuck
display()

80. 3

84. 策略模式
Strategy

85. Strategy

86. Strategy

87. Strategy

88. Strategy

89. 為什麼我們需要學設計模式

90. Z > B

91. Z > B

94. Jas
!

97. 結論

98. 變化
設計

99. Thanks
Jason Chung