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通过反射操作属性小栗子

简单聊育儿 2022-02-14 阅读 39
 public static void main(String[] args) throws InstantiationException, IllegalAccessException, NoSuchMethodException, InvocationTargetException, NoSuchFieldException {
        Class student = Student.class;

        //通过反射获取一个无参构造对象
        Student s1 = (Student) student.newInstance();
        System.out.println(s1);

        //通过反射获取一个有参构造对象
        Constructor constructor = student.getConstructor(Integer.class, String.class, int.class);
        Student s2 = (Student) constructor.newInstance(18, "小红", 1);
        System.out.println(s2);

        //通过反射调用普通方法
        //先获取一个对象
        Student s3 = (Student) student.newInstance();
        //获取一个方法
        Method setName = student.getDeclaredMethod("setName", String.class);
        //invoke:激活(对象,方法的值)
        setName.invoke(s3,"红红");
        System.out.println(s3.getName());

        //通过反射操作属性
        Student s4 = (Student) student.newInstance();
        Field name = student.getDeclaredField("name");
        ///不能直接操作私有属性
        //关闭安全检测
        name.setAccessible(true);
        name.set(s4,"敏敏");
        System.out.println(s4.getName());
    }
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