利用反射给对象按顺序赋值

需求：某一个类有属性1~12月，赋值顺序为5月，6月，7月，8月，9月，10月，11月，12月，1月，2月，3月，4月；输入开始月份（val1）和结束月份（val2）使得期间的所有月份赋值为1。

基本思路：通过反射获取Demo类的所有月份的setter，然后按以上顺序放到Method[ ] methods数组里，根据输入的月份区间顺序地执行setter方法。

Demo类：

 1 public class Demo {
 2     //5月
 3     private int May;
 4     
 5     //6月
 6     private int June;
 7     
 8     //7月
 9     private int July;
10     
11     //8月
12     private int August;
13     
14     //9月
15     private int September;
16     
17     //10月
18     private int October;
19     
20     //11月
21     private int November;
22     
23     //12月
24     private int December;
25     
26     //1月
27     private int January;
28     
29     //2月
30     private int February;
31     
32     //3月
33     private int March;
34     
35     //4月
36     private int April;
37     
38     public void setMay(int may) {
39         May = may;
40     }
41     
42     public void setJune(int june) {
43         June = june;
44     }
45     
46     public void setJuly(int july) {
47         July = july;
48     }
49     
50     public void setAugust(int august) {
51         August = august;
52     }
53     
54     public void setSeptember(int september) {
55         September = september;
56     }
57     
58     public void setOctober(int october) {
59         October = october;
60     }
61     
62     public void setNovember(int november) {
63         November = november;
64     }
65 
66     public void setDecember(int december) {
67         December = december;
68     }
69 
70     public void setJanuary(int january) {
71         January = january;
72     }
73 
74     public void setFebruary(int february) {
75         February = february;
76     }
77 
78     public void setMarch(int march) {
79         March = march;
80     }
81 
82     public void setApril(int april) {
83         April = april;
84     }
85 }

oneTest赋值&测试类：

 1 public class oneTest {
 2     public static void main(String[] args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
 3         oneTest test = new oneTest();
 4         
 5         //9月到明年2月
 6         Demo demo = test.Myfunction(9, 2);
 7         System.out.println(demo);        
 8     }
 9     
10     
11     //给连续的月份赋值
12     public  Demo Myfunction(int val1,int val2) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{
13         //5---12 减5变成 0---7 ; 1---4 加7变成 8---11
14         int start = val1 >= 5 && val1 <=12?val1-5:val1+7;
15         int end = val2 >= 5 && val2 <=12?val2-5:val2+7;
16         Demo demo = new Demo();
17         Class clazz = Demo.class;
18         //空数组
19         Method[] methods =new Method[12];
20         
21         //通过反射得到Demo类的方法
22         Method[] tempmethods =clazz.getDeclaredMethods();
23         
24         //给方法排序5月---12月---4月
25         for(int i = 0 ; i < tempmethods.length ; i++) {
26             if(tempmethods[i].getName().equals("setMay")) {
27                 methods[0] = tempmethods[i];
28             }
29             if(tempmethods[i].getName().equals("setJune")) {
30                 methods[1] = tempmethods[i];
31             }
32             if(tempmethods[i].getName().equals("setJuly")) {
33                 methods[2] = tempmethods[i];
34             }
35             if(tempmethods[i].getName().equals("setAugust")) {
36                 methods[3] = tempmethods[i];
37             }
38             if(tempmethods[i].getName().equals("setSeptember")) {
39                 methods[4] = tempmethods[i];
40             }
41             if(tempmethods[i].getName().equals("setOctober")) {
42                 methods[5] = tempmethods[i];
43             }
44             if(tempmethods[i].getName().equals("setNovember")) {
45                 methods[6] = tempmethods[i];
46             }
47             if(tempmethods[i].getName().equals("setDecember")) {
48                 methods[7] = tempmethods[i];
49             }
50             if(tempmethods[i].getName().equals("setJanuary")) {
51                 methods[8] = tempmethods[i];
52             }
53             if(tempmethods[i].getName().equals("setFebruary")) {
54                 methods[9] = tempmethods[i];
55             }
56             if(tempmethods[i].getName().equals("setMarch")) {
57                 methods[10] = tempmethods[i];
58             }
59             if(tempmethods[i].getName().equals("setApril")) {
60                 methods[11] = tempmethods[i];
61             }
62         }
63         
64         //执行相应的set方法
65         for(int i = start;i <= end ; i++) {
66             methods[i].invoke(demo, 1);
67         }
68         return demo;
69     }
70 }

输出结果：

Demo [May=0, June=0, July=0, August=0, September=1, October=1, November=1, December=1, January=1, February=1, March=0, April=0]

 

原文链接:https://www.cnblogs.com/zyb-mini/p/reflectSetField.html
如有疑问请与原作者联系

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