Java 枚举的构造函数使用反射进行获取和调用
枚举的构造函数使用反射进行获取和调用
实例源码：
源代码：
执行
执行中...
x
1
2
import java.lang.reflect.Constructor;3
4
import java.lang.reflect.InvocationTargetException;5
/* from 6
n o w j a v a . c o m*/7
8
import static java.lang.System.out;9
10
11
enum Charge {12
13
POSITIVE, NEGATIVE, NEUTRAL;14
15
Charge() {16
17
out.format("under construction%n");18
19
}20
21
}22
23
24
public class EnumTrouble {25
26
27
public static void main(String args) {/**时 代 J a v a 公 众 号**/28
29
try {30
31
Class<?> c = Charge.class;32
33
34
Constructor[] ctors = c.getDeclaredConstructors();35
36
for (Constructor ctor : ctors) {37
38
out.format("Constructor: %s%n", ctor.toGenericString());39
40
ctor.setAccessible(true);41
42
ctor.newInstance();43
44
}45
46
47
// production code should handle these exceptions more gracefully48
49
} catch (InstantiationException x) {50
51
x.printStackTrace();52
53
} catch (IllegalAccessException x) {54
55
x.printStackTrace();56
57
} catch (InvocationTargetException x) {58
59
x.printStackTrace();60
61
}62
63
}64
65
}66
67
68
/*69
70
* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.71
72
*73
74
* Redistribution and use in source and binary forms, with or without75
76
* modification, are permitted provided that the following conditions77
78
* are met:79
80
*81
82
* - Redistributions of source code must retain the above copyright83
84
* notice, this list of conditions and the following disclaimer.85
86
*87
88
* - Redistributions in binary form must reproduce the above copyright89
90
* notice, this list of conditions and the following disclaimer in the91
92
* documentation and/or other materials provided with the distribution.93
94
*95
96
* - Neither the name of Oracle or the names of its97
98
* contributors may be used to endorse or promote products derived99
100
* from this software without specific prior written permission.101
102
*103
104
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS105
106
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,107
108
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR109
110
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR111
112
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,113
/**代码未完, 请加载全部代码(NowJava.com).**/执行结果：
本文系作者在时代Java发表，未经许可，不得转载。如有侵权，请联系nowjava@qq.com删除。
编辑于
关注时代Java