今天在写mybatis相关代码时,在创建了两个类，一个account类,另一个是accountUser类作为子类
代码如下
account类作为父类

package com.domain;

import java.io.Serializable;

public class Account implements Serializable {
    private Integer ID;
    private Integer UID;
    private Double  MONEY;

    public Integer getID() {
        return ID;
    }

    public void setID(Integer ID) {
        this.ID = ID;
    }

    public Integer getUID() {
        return UID;
    }

    public void setUID(Integer UID) {
        this.UID = UID;
    }

    public Double getMONEY() {
        return MONEY;
    }

    public void setMONEY(Double MONEY) {
        this.MONEY = MONEY;
    }

    @Override
    public String toString() {
        return "Account{" +
                "ID=" + ID +
                ", UID=" + UID +
                ", MONEY=" + MONEY +
                '}';
    }
}

AccountUser 作为子类

package com.domain;

import java.io.Serializable;

public class AccountUser extends Account implements Serializable{

    private String username;
    private String address;

    public String getUsername() {
        return username;
    }

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

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    //这里不能用这种方法

//    @Override
//    public String toString() {
//        return "AccountUser{" +
//                "username='" + username + '\'' +
//                ", address='" + address + '\'' +
//                '}';
//    }

    //要加上父类的tostring方法
    public String toString() {
        return super.toString()
        +"AccountUser{" +
                "username='" + username + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

但是在测试时发现

打印不出父类的信息，发现是自己的子类的tostring方法写的有问题

要写成下面，先继承父类的tostring方法

//要加上父类的tostring方法
   public String toString() {
        return super.toString() + " AccountUser [username=" + username + ",address=" + address + "]";
    }

这样就好了

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