## **1.创建pojo包，包名为：com.baishenghua200.pojo** 在该包下创建以下类： ### **1.1创建导航菜单类** >创建导航菜单类Menu200.java 四个个属性：菜单编号、菜单名称、菜单地址和菜单序号。属性名上也加上学号后三位 重写hashCode（）和equals()方法 重写toString()方法 实现可序列化接口 创建有参和无参构造方法  ``` package com.baishenghua200.pojo; import java.io.Serializable; /** * Menu200.java(导航菜单类) * @desc 导航菜单 * @author 柏圣华 * @date 2022-1-3 * */ public class Menu200 implements Serializable{ private static final long serialVersionUID = 1L; private int id200;//导航菜单编号 private String menuName200;//导航菜单名称 private String menuURL200;//导航菜单地址 private String menuNo200;//导航菜单序号 public Menu200() {//无参构造方法 super(); } //有参构造方法 public Menu200(int id200, String menuName200, String menuURL200, String menuNo200) { super(); this.id200 = id200; this.menuName200 = menuName200; this.menuURL200 = menuURL200; this.menuNo200 = menuNo200; } @Override public String toString() { return "Menu200 [id200=" + id200 + ", menuName200=" + menuName200 + ", menuURL200=" + menuURL200 + ", menuNo200=" + menuNo200 + "]"; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + id200; result = prime * result + ((menuName200 == null) ? 0 : menuName200.hashCode()); result = prime * result + ((menuNo200 == null) ? 0 : menuNo200.hashCode()); result = prime * result + ((menuURL200 == null) ? 0 : menuURL200.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Menu200 other = (Menu200) obj; if (id200 != other.id200) return false; if (menuName200 == null) { if (other.menuName200 != null) return false; } else if (!menuName200.equals(other.menuName200)) return false; if (menuNo200 == null) { if (other.menuNo200 != null) return false; } else if (!menuNo200.equals(other.menuNo200)) return false; if (menuURL200 == null) { if (other.menuURL200 != null) return false; } else if (!menuURL200.equals(other.menuURL200)) return false; return true; } public int getId200() { return id200; } public void setId200(int id200) { this.id200 = id200; } public String getMenuName200() { return menuName200; } public void setMenuName200(String menuName200) { this.menuName200 = menuName200; } public String getMenuURL200() { return menuURL200; } public void setMenuURL200(String menuURL200) { this.menuURL200 = menuURL200; } public String getMenuNo200() { return menuNo200; } public void setMenuNo200(String menuNo200) { this.menuNo200 = menuNo200; } } ``` ### **1.2创建公司信息类** >如何抽象设计，降低难度，只设计关于我们这个模块 创建公司信息类CompanyInfomation200.java 6个属性：编号、标题、图片、内容、编辑时间和序号，要求属性名上也加上学号后三位 重写hashCode（）和equals()方法 重写toString()方法 实现可序列化接口 生成有参和无参构造方法 生成getter和setter方法  ``` package com.baishenghua200.pojo; import java.io.Serializable; /** * CompanyInfomation200.java(公司信息类) * @desc 导航菜单 * @author 柏圣华 * @date 2022-1-3 * */ public class CompanyInfomation200 implements Serializable{ private static final long serialVersionUID = 1L; private int ciId200;//公司信息编号 private String ciTitle200;//公司信息标题 private String ciImage200;//公司信息图片 private String ciContent200;//公司信息内容 private String ciEditDate200;//公司信息编辑时间 private int ciNo200;//公司信息序号 //生成setter和getter方法 //重写hashCode()、toString()和Equals()方法 //生成有参构造方法和无参构造方法 @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((ciContent200 == null) ? 0 : ciContent200.hashCode()); result = prime * result + ((ciEditDate200 == null) ? 0 : ciEditDate200.hashCode()); result = prime * result + ciId200; result = prime * result + ((ciImage200 == null) ? 0 : ciImage200.hashCode()); result = prime * result + ciNo200; result = prime * result + ((ciTitle200 == null) ? 0 : ciTitle200.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; CompanyInfomation200 other = (CompanyInfomation200) obj; if (ciContent200 == null) { if (other.ciContent200 != null) return false; } else if (!ciContent200.equals(other.ciContent200)) return false; if (ciEditDate200 == null) { if (other.ciEditDate200 != null) return false; } else if (!ciEditDate200.equals(other.ciEditDate200)) return false; if (ciId200 != other.ciId200) return false; if (ciImage200 == null) { if (other.ciImage200 != null) return false; } else if (!ciImage200.equals(other.ciImage200)) return false; if (ciNo200 != other.ciNo200) return false; if (ciTitle200 == null) { if (other.ciTitle200 != null) return false; } else if (!ciTitle200.equals(other.ciTitle200)) return false; return true; } @Override public String toString() { return "CompanyInfomation200 [ciId200=" + ciId200 + ", ciTitle200=" + ciTitle200 + ", ciImage200=" + ciImage200 + ", ciContent200=" + ciContent200 + ", ciEditDate200=" + ciEditDate200 + ", ciNo200=" + ciNo200 + "]"; } public CompanyInfomation200() { super(); } public CompanyInfomation200(int ciId200, String ciTitle200, String ciImage200, String ciContent200, String ciEditDate200, int ciNo200) { super(); this.ciId200 = ciId200; this.ciTitle200 = ciTitle200; this.ciImage200 = ciImage200; this.ciContent200 = ciContent200; this.ciEditDate200 = ciEditDate200; this.ciNo200 = ciNo200; } public int getCiId200() { return ciId200; } public void setCiId200(int ciId200) { this.ciId200 = ciId200; } public String getCiTitle200() { return ciTitle200; } public void setCiTitle200(String ciTitle200) { this.ciTitle200 = ciTitle200; } public String getCiImage200() { return ciImage200; } public void setCiImage200(String ciImage200) { this.ciImage200 = ciImage200; } public String getCiContent200() { return ciContent200; } public void setCiContent200(String ciContent200) { this.ciContent200 = ciContent200; } public String getCiEditDate200() { return ciEditDate200; } public void setCiEditDate200(String ciEditDate200) { this.ciEditDate200 = ciEditDate200; } public int getCiNo200() { return ciNo200; } public void setCiNo200(int ciNo200) { this.ciNo200 = ciNo200; } } ``` ### **1.3创建用户信息类** >如何抽象设计，降低难度，只设计关于我们这个模块 创建用户信息类User200.java 6个属性：编号、姓名、性别、年龄、地址、QQ、邮箱、账号和密码 ，要求属性名上也加上学号后三位 重写hashCode（）和equals()方法 重写toString()方法 实现可序列化接口 生成有参和无参构造方法 生成getter和setter方法  ``` package com.baishenghua200.pojo; import java.io.Serializable; /** * User200.java(用户类) * @desc 描述用户的属性和方法 * @author 柏圣华 * @date 2022-1-3 * */ public class User200 implements Serializable{ private static final long serialVersionUID = 1L; private int id200; private String name200; private String gender200; private int age200; private String address200; private String qq200; private String email200; private String username200; private String password200; //生成setter和getter方法 //重写hashCode()、toString()和Equals()方法 //生成有参构造方法和无参构造方法 //实现可序列化接口 public User200(int id200, String name200, String gender200, int age200, String address200, String qq200, String email200, String username200, String password200) { super(); this.id200 = id200; this.name200 = name200; this.gender200 = gender200; this.age200 = age200; this.address200 = address200; this.qq200 = qq200; this.email200 = email200; this.username200 = username200; this.password200 = password200; } public User200() { super(); } public int getId200() { return id200; } public void setId200(int id200) { this.id200 = id200; } public String getName200() { return name200; } public void setName200(String name200) { this.name200 = name200; } public String getGender200() { return gender200; } public void setGender200(String gender200) { this.gender200 = gender200; } public int getAge200() { return age200; } public void setAge200(int age200) { this.age200 = age200; } public String getAddress200() { return address200; } public void setAddress200(String address200) { this.address200 = address200; } public String getQq200() { return qq200; } public void setQq200(String qq200) { this.qq200 = qq200; } public String getEmail200() { return email200; } public void setEmail200(String email200) { this.email200 = email200; } public String getUsername200() { return username200; } public void setUsername200(String username200) { this.username200 = username200; } public String getPassword200() { return password200; } public void setPassword200(String password200) { this.password200 = password200; } @Override public String toString() { return "User200 [id200=" + id200 + ", name200=" + name200 + ", gender200=" + gender200 + ", age200=" + age200 + ", address200=" + address200 + ", qq200=" + qq200 + ", email200=" + email200 + ", username200=" + username200 + ", password200=" + password200 + "]"; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((address200 == null) ? 0 : address200.hashCode()); result = prime * result + age200; result = prime * result + ((email200 == null) ? 0 : email200.hashCode()); result = prime * result + ((gender200 == null) ? 0 : gender200.hashCode()); result = prime * result + id200; result = prime * result + ((name200 == null) ? 0 : name200.hashCode()); result = prime * result + ((password200 == null) ? 0 : password200.hashCode()); result = prime * result + ((qq200 == null) ? 0 : qq200.hashCode()); result = prime * result + ((username200 == null) ? 0 : username200.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; User200 other = (User200) obj; if (address200 == null) { if (other.address200 != null) return false; } else if (!address200.equals(other.address200)) return false; if (age200 != other.age200) return false; if (email200 == null) { if (other.email200 != null) return false; } else if (!email200.equals(other.email200)) return false; if (gender200 == null) { if (other.gender200 != null) return false; } else if (!gender200.equals(other.gender200)) return false; if (id200 != other.id200) return false; if (name200 == null) { if (other.name200 != null) return false; } else if (!name200.equals(other.name200)) return false; if (password200 == null) { if (other.password200 != null) return false; } else if (!password200.equals(other.password200)) return false; if (qq200 == null) { if (other.qq200 != null) return false; } else if (!qq200.equals(other.qq200)) return false; if (username200 == null) { if (other.username200 != null) return false; } else if (!username200.equals(other.username200)) return false; return true; } } ``` ### **1.4创建留言信息类** >如何抽象设计，降低难度，只设计关于我们这个模块 创建留言信息类Message200.java 3个属性：编号、标题和内容，要求属性名上也加上学号后三位 重写hashCode（）和equals()方法 重写toString()方法 实现可序列化接口 生成有参和无参构造方法 生成getter和setter方法  ``` package com.baishenghua200.pojo; import java.io.Serializable; /** * Message200.java(留言类) * @desc 描述留言的属性和方法 * @author 柏圣华 * @date 2022-1-4 * */ public class Message200 implements Serializable{ private static final long serialVersionUID = 1L; private int id200;//留言编号 private String title200;//留言标题 private String content200;//留言内容 public Message200(int id200, String title200, String content200) { super(); this.id200 = id200; this.title200 = title200; this.content200 = content200; } public Message200() { super(); } public int getId200() { return id200; } public void setId200(int id200) { this.id200 = id200; } public String getTitle200() { return title200; } public void setTitle200(String title200) { this.title200 = title200; } public String getContent200() { return content200; } public void setContent200(String content200) { this.content200 = content200; } @Override public String toString() { return "Message200 [id200=" + id200 + ", title200=" + title200 + ", content200=" + content200 + "]"; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((content200 == null) ? 0 : content200.hashCode()); result = prime * result + id200; result = prime * result + ((title200 == null) ? 0 : title200.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Message200 other = (Message200) obj; if (content200 == null) { if (other.content200 != null) return false; } else if (!content200.equals(other.content200)) return false; if (id200 != other.id200) return false; if (title200 == null) { if (other.title200 != null) return false; } else if (!title200.equals(other.title200)) return false; return true; } } ```