Java反射【四、成员变量的反射和构造的反射】-优快云博客

获取一个类下所有字段信息

Field[] fs = c.getFields(); 获取所有字段（public）
Field[] fs = c.getDeclaredFields(); 获取所有声明字段
Class c = f.getType(); 获取字段类型
String s = f.getName(); 获取字段名称

Demo:

    public static void printFieldsMsg(Object obj) {
    Class c = obj.getClass();
    //打印输出所有成员变量的信息
    Field[] fs = c.getFields();
    for (Field field : fs) {
        Class type =  field.getType();
        String typeName = type.getSimpleName();
        String name = field.getName();
        System.out.println(typeName+" "+name);
    }
}

获取构造信息

Constructor[] cs = c.getConstructors(); 获取构造函数列表

Demo:

    public static void printConMessage(Object obj){
    Class c = obj.getClass();
    Constructor[] cs = c.getConstructors();
    for (Constructor constructor : cs) {
        System.out.print(constructor.getName()+"(");
        for (Class param : constructor.getParameterTypes()) {
            System.out.print(param.getSimpleName()+",");
        }
        System.out.println(")");
    }
}

转载于:https://www.cnblogs.com/shanelau/p/6581995.html