回答編集履歴
1
追記
test
CHANGED
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@@ -12,7 +12,7 @@
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12
12
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13
13
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```java
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14
14
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15
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-
Map<Strin, Object> mp = new HashMap<>();
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15
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+
Map<String, Object> mp = new HashMap<>();
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16
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17
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18
18
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@@ -67,3 +67,33 @@
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67
67
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68
68
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69
69
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```
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70
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71
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72
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73
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普通は、ポリモーフィズムを用いるのでif文は、いりません。
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74
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75
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76
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77
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```java
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78
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79
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Map<String, Shape> mp = new HashMap<>();
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80
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81
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82
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83
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中略
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84
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85
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86
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87
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Shape tmp = mp.get(key);
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88
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89
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90
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91
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String str = tmp != null ? tmp.toString() : "null";
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92
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93
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double area = tmp != null ? tmp.getArea() : -1;
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94
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95
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96
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97
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System.out.println(str+" "+area);
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98
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99
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```
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