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：

public class Demo {
    //5月
    private int May;
    
    //6月
    private int June;
    
    //7月
    private int July;
    
    //8月
    private int August;
    
    //9月
    private int September;
    
    //10月
    private int October;
    
    //11月
    private int November;
    
    //12月
    private int December;
    
    //1月
    private int January;
    
    //2月
    private int February;
    
    //3月
    private int March;
    
    //4月
    private int April;
    
    public void setMay(int may) {
        May = may;
    }
    
    public void setJune(int june) {
        June = june;
    }
    
    public void setJuly(int july) {
        July = july;
    }
    
    public void setAugust(int august) {
        August = august;
    }
    
    public void setSeptember(int september) {
        September = september;
    }
    
    public void setOctober(int october) {
        October = october;
    }
    
    public void setNovember(int november) {
        November = november;
    }

    public void setDecember(int december) {
        December = december;
    }

    public void setJanuary(int january) {
        January = january;
    }

    public void setFebruary(int february) {
        February = february;
    }

    public void setMarch(int march) {
        March = march;
    }

    public void setApril(int april) {
        April = april;
    }
}

oneTest赋值&测试类：

public class oneTest {
    public static void main(String[] args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
        oneTest test = new oneTest();
        
        //9月到明年2月
        Demo demo = test.Myfunction(9, 2);
        System.out.println(demo);        
    }
    
    
    //给连续的月份赋值
    public  Demo Myfunction(int val1,int val2) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{
        //5---12 减5变成 0---7 ; 1---4 加7变成 8---11
        int start = val1 >= 5 && val1 <=12?val1-5:val1+7;
        int end = val2 >= 5 && val2 <=12?val2-5:val2+7;
        Demo demo = new Demo();
        Class clazz = Demo.class;
        //空数组
        Method[] methods =new Method[12];
        
        //通过反射得到Demo类的方法
        Method[] tempmethods =clazz.getDeclaredMethods();
        
        //给方法排序5月---12月---4月
        for(int i = 0 ; i < tempmethods.length ; i++) {
            if(tempmethods[i].getName().equals("setMay")) {
                methods[0] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setJune")) {
                methods[1] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setJuly")) {
                methods[2] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setAugust")) {
                methods[3] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setSeptember")) {
                methods[4] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setOctober")) {
                methods[5] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setNovember")) {
                methods[6] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setDecember")) {
                methods[7] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setJanuary")) {
                methods[8] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setFebruary")) {
                methods[9] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setMarch")) {
                methods[10] = tempmethods[i];
            }
            if(tempmethods[i].getName().equals("setApril")) {
                methods[11] = tempmethods[i];
            }
        }
        
        //执行相应的set方法
        for(int i = start;i <= end ; i++) {
            methods[i].invoke(demo, 1);
        }
        return demo;
    }
}

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]