1 /**
2 * 名称: 简单工厂模式
3 * 详情:
4 * 1.UML图中 '+':public '-':private '#':protected
5 * 2.UML图中 继承--(空心三角形+实线)
6 * 接口--(空心三角形+虚线)
7 * 关联--[当一个类'知道'另一个类,有相互调用,箭头指向另一个类]--(箭头+实线)
8 * 聚合--[弱拥有,大雁和雁群的关系,箭头指向部分]--(空心菱形+实线+箭头)
9 * 合成/组合--[强拥有,鸟和翅膀的关系,箭头指向部分]--(实心菱形+实线+箭头)
10 * 依赖--[动物依赖于氧气和水,区分于聚合和组合,箭头指向被依赖类]--(虚线+箭头)
11 *
12 * 3.简单工厂模式指的是使用一个简单的类来进行实例的创建 例如:计算器的实现
13 *
14 */
15
16 /**
17 * 操作类
18 */
19 abstract class Operation{
20 private double NumA = 0;
21 private double NumB = 0;
22
23 public double getNumA() {
24 return NumA;
25 }
26
27 public double getNumB() {
28 return NumB;
29 }
30
31 public void setNumA(double numA) {
32 NumA = numA;
33 }
34
35 public void setNumB(double numB) {
36 NumB = numB;
37 }
38
39 abstract public double GetResult();
40 }
41
42 /**
43 * 加法
44 */
45 class OperationAdd extends Operation{
46
47 @Override
48 public double GetResult() {
49 double result = 0;
50 result = getNumA() + getNumB();
51 return result;
52 }
53 }
54
55 /**
56 * 减法
57 */
58 class OperationSub extends Operation{
59
60 @Override
61 public double GetResult() {
62 double result = 0;
63 result = getNumA() - getNumB();
64 return result;
65 }
66 }
67
68 /**
69 * 乘法
70 */
71 class OperationMul extends Operation{
72
73 @Override
74 public double GetResult() {
75 double result = 0;
76 result = getNumA() * getNumB();
77 return result;
78 }
79 }
80
81 /**
82 * 乘法
83 */
84 class OperationDiv extends Operation{
85
86 @Override
87 public double GetResult() {
88 double result = 0;
89 result = getNumA() / getNumB();
90 return result;
91 }
92 }
93
94 /**
95 * 简单工厂
96 */
97 class OperationSimpleFactory{
98 public static Operation createOperation(String operate){
99 Operation oper = null;
100 switch (operate){
101 case "+":
102 oper = new OperationAdd();
103 break;
104 case "-":
105 oper = new OperationSub();
106 break;
107 case "*":
108 oper = new OperationMul();
109 break;
110 case "/":
111 oper = new OperationDiv();
112 break;
113 }
114 return oper;
115 }
116 }
117
118
119 public class SimpleFactory01 {
120
121 public static void main(String[] args) {
122
123 /**
124 * 调用
125 */
126 Operation add = OperationSimpleFactory.createOperation("+");
127 add.setNumA(10);
128 add.setNumB(20);
129 double result = add.GetResult();
130 }
131 }
