不在实体类toString方法黎明声明的字段，调用时不会打印未声明的字段测试验证

package base;

import net.sf.oval.constraint.NotBlank;
import net.sf.oval.constraint.NotNull;

public class User {

    @NotBlank(
            message = "用户名称不能为空"
    )
    @NotNull(
            message = "用户名称不能为空"
    )
    private String userName;

    @NotBlank(
            message = "年龄不能为空"
    )
    @NotNull(
            message = "年龄不能为空"
    )
    private String age;

    private String gender;


    public String getUserName() {
        return this.userName;
    }

    public String getAge() {
        return this.age;
    }

    public String getGender() {
        return this.gender;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String toString() {
        return "User(super=" + super.toString() + ", userName=" + this.getUserName() + ", age=" + this.getAge() + ")";
    }

}

package service;

import base.User;

/**
 * toString打印字段测试
 *
 * @author zhangkuankuan
 * @version Id: ToStringPrintlnTest.java, v 0.1 2022/08/19 17:01 zhangkuankuan Exp $$
 */
public class ToStringPrintlnTest {

    public User test() {
        User user = new User();
        user.setUserName("zhangsan");
        user.setAge("18");
        user.setGender("男");
        System.out.println(user);
        return user;
    }

    public static void main(String[] args) {
        ToStringPrintlnTest printlnTest = new ToStringPrintlnTest();
        User user = printlnTest.test();
        System.out.println(user);//不在实体类toString方法黎明声明的字段，调用时不会打印未声明的字段测试验证
    }
}