Java實訓項目7：GUI學生信息管理系統 - 實現步驟 - 創建實體類

七、實現步驟

（三）創建實體類

爲了便於分類管理項目中不同功能的類或接口，我們需要創建不同包，比如，實體類就放在net.hw.student.bean包裏。其中hw是作者拼音名縮寫，同學們創建時就改成自己的拼音名縮寫。

• 在src裏創建net.hw.student.bean包
  
• 依次創建四個實體類：College、Status、Student與User，分別對應t_college表、t_status表、t_student表與t_user表。
• 實體類的屬性對應於數據表的字段，主要兩者的數據類型要匹配，網上可以搜索到MySQL數據類型與Java數據類型的匹配對應表。

1、創建學校實體類對應學校表

package net.hw.student.bean;

import java.util.Date;

/**
 * 功能：學校實體類
 * 作者：華衛
 * 日期：2020年06月05日
 */
public class College {
    private int id; // 學校標識符
    private String name; // 學校名稱
    private String president; // 校長
    private Date startTime; // 建校時間
    private String telephone; // 聯繫電話
    private String email; // 電子郵箱
    private String address; // 通信地址
    private String profile; // 學校簡介

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPresident() {
        return president;
    }

    public void setPresident(String president) {
        this.president = president;
    }

    public Date getStartTime() {
        return startTime;
    }

    public void setStartTime(Date startTime) {
        this.startTime = startTime;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAddress() {
        return address;
    }

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

    public String getProfile() {
        return profile;
    }

    public void setProfile(String profile) {
        this.profile = profile;
    }

    @Override
    public String toString() {
        return "College{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", president='" + president + '\'' +
                ", startTime=" + startTime +
                ", telephone='" + telephone + '\'' +
                ", email='" + email + '\'' +
                ", address='" + address + '\'' +
                ", profile='" + profile + '\'' +
                '}';
    }
}

• 注意：導入的日期類是util包裏的Date類，import java.util.Date; 不要導成sql包裏的Date類。

2、創建狀態實體類對應狀態表

package net.hw.student.bean;

/**
 * 功能：狀態實體類
 * 作者：華衛
 * 日期：2020年06月05日
 */
public class Status {
    private int id; // 狀態標識符
    private String college; // 校名
    private String version; // 軟件版本
    private String author; // 軟件作者
    private String telephone; // 聯繫電話
    private String address; // 通信地址
    private String email; // 電子郵箱

    public int getId() {
        return id;
    }

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

    public String getCollege() {
        return college;
    }

    public void setCollege(String college) {
        this.college = college;
    }

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public String getAddress() {
        return address;
    }

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

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Status{" +
                "id=" + id +
                ", college='" + college + '\'' +
                ", version='" + version + '\'' +
                ", author='" + author + '\'' +
                ", telephone='" + telephone + '\'' +
                ", address='" + address + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

3、創建學生實體類對應學生表

package net.hw.student.bean;

/**
 * 功能：學生實體類
 * 作者：華衛
 * 日期：2020年06月05日
 */
public class Student {
    private String id; // 學號
    private String name; // 姓名
    private String sex; // 性別
    private int age; // 年齡
    private String department; // 系部
    private String clazz; // 班級
    private String telephone; // 聯繫電話

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

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

    public String getDepartment() {
        return department;
    }

    public void setDepartment(String department) {
        this.department = department;
    }

    public String getClazz() {
        return clazz;
    }

    public void setClazz(String clazz) {
        this.clazz = clazz;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", age=" + age +
                ", department='" + department + '\'' +
                ", clazz='" + clazz + '\'' +
                ", telephone='" + telephone + '\'' +
                '}';
    }
}

4、創建用戶實體類對應用戶表

package net.hw.student.bean;

import java.util.Date;

/**
 * 功能：用戶實體類
 * 作者：華衛
 * 日期：2020年06月05日
 */
public class User {
    private int id; // 用戶標識符
    private String username; // 用戶名
    private String password; // 密碼
    private String telephone; // 聯繫電話
    private Date registerTime; // 註冊時間

    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;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public Date getRegisterTime() {
        return registerTime;
    }

    public void setRegisterTime(Date registerTime) {
        this.registerTime = registerTime;
    }

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

• 注意：導入的日期類是util包裏的Date類，import java.util.Date; 不要導成sql包裏的Date類。