Reflect获取私有属性和私有方法

Posted 2022-12-08 我的小侯子

Person类：

public class Person
    private int age = 18;

    private int getAge(int a) 
        return age + a;
    

在Mainactivity中：

Person person= new Person();
        Class<? extends Person> cls = person.getClass();
        try 
            Field field = cls.getDeclaredField("age");
            field.setAccessible(true);
            Object age=field.get(reflect);//此处的Object就是age对象的值
//            Log.e("111", "==field====" + age);

//            Log.e("111", "==field.getType()====" + field.getType().getName());
            Method method = cls.getDeclaredMethod("getAge", int.class);
            method.setAccessible(true);
            Object invoke = method.invoke(reflect, 7);
//            Log.e("111", "==invoke====" + invoke);

            Constructor<? extends ReflectText> constructor = cls.getDeclaredConstructor();
            ReflectText reflectText = constructor.newInstance();
//            Log.e("111", "==reflectText====" + reflectText);
         catch (NoSuchFieldException e) 
            e.printStackTrace();
         catch (IllegalAccessException e) 
            e.printStackTrace();
         catch (NoSuchMethodException e) 
            e.printStackTrace();
         catch (InvocationTargetException e) 
            e.printStackTrace();
         catch (InstantiationException e)