new对象放不进List集合中

Question

创建了一个User实体类
一个UserMapper接口，接口中有findByCondition方法。
想把condition放入集合当中，之后打印出来，发现放不进去。

实体类：

package com.itheima.domain;

public class User {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

接口：

package com.itheima.mapper;

import com.itheima.domain.User;

import java.util.List;

public interface UserMapper {
    public List<User> findByCondition(User user);
}

Answer 1