NoSuchMethodException

我今天写代码发现了问题

Exception in thread "main" java.lang.NoSuchMethodException: com.fan.model.User.<init>(int, java.lang.String, java.lang.String)
	at java.lang.Class.getConstructor0(Class.java:3082)
	at java.lang.Class.getDeclaredConstructor(Class.java:2178)
	at com.fan.reflect.获得一个构造方法并创建对象.main(获得一个构造方法并创建对象.java:19)

进程已结束,退出代码1

我的代码:

package com.fan.reflect;

import com.fan.model.User;

import java.lang.reflect.Constructor;
public class 获得一个构造方法并创建对象 {
    public static void main(String[] args) throws Exception{
        Class<User> userClass = User.class;
        //使用默认的构造方法创建对象,但JDK11以后就过期了,
//        User user = userClass.newInstance();
        //获得无参数的构造方法对象
//        Constructor<User> declaredConstructor = userClass.getDeclaredConstructor();
//        //使用构造方法创建类的对象,调用无参数的构造方法
//        User user = declaredConstructor.newInstance();
//
        //获得有参数的构造方法对象
        Constructor<User> declaredConstructor = userClass.getDeclaredConstructor(int.class, String.class, String.class);
        //使用构造方法创建类的对象,调用有参数的构造方法
        User user = declaredConstructor.newInstance(11, "樊军刚", "123456");
        System.out.println(user);


    }
}

package com.fan.model;
public class User {
    private Integer  user_id;
    public   String  user_name;
    private  String  user_password;

    public User(Integer user_id, String user_name, String user_password) {
        this.user_id = user_id;
        this.user_name = user_name;
        this.user_password = user_password;
    }

    public User() {
    }

    public Integer getUser_id() {
        return user_id;
    }

    public void setUser_id(Integer user_id) {
        this.user_id = user_id;
    }

    public String getUser_name() {
        return user_name;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public String getUser_password() {
        return user_password;
    }

    public void setUser_password(String user_password) {
        this.user_password = user_password;
    }

    @Override
    public String toString() {
        return "User{" +
                "user_id=" + user_id +
                ", user_name='" + user_name + '\'' +
                ", user_password='" + user_password + '\'' +
                '}';
    }
}

我的问题出在了我那个获取有参数的构造方法

Constructor<User> declaredConstructor = userClass.getDeclaredConstructor(int.class, String.class, String.class);

和
User类中的有参构造类型不匹配

 public User(Integer user_id, String user_name, String user_password) {
        this.user_id = user_id;
        this.user_name = user_name;
        this.user_password = user_password;
    }

在反射中用构造函数创建对象时,那个调用newInstance时的有参列表必须和那个实体类的有参列表类型一致,顺序一致!
即便是int和Integer也要分的清楚,不能互相替代!