Java第二周感受

最新推荐文章于 2022-08-16 21:26:18 发布

原创最新推荐文章于 2022-08-16 21:26:18 发布 · 230 阅读

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比较有意思的就是做系统吧，有点难度，综合性比较强，很有挑战性，做的是一个学生日志管理系统：

完成学生日志内容管理系统-学生端，日志信息主要包含:日志编号，今日学习内容，掌握程度，疑问，日志填写人，项目包含主要实体类:

学生类(学号，姓名，密码)
日志类(编号，今日学习内容，掌握程度(了解，熟练，精通)，疑问，学生)
其余操作类自行设计

要求实现功能如下:

学生添加
学生登录
日志提交
日志编号要求自动生成(可从1开始自动递增)
查看当前登录人提交的所有日志
修改当前等路人提交的日志内容
退出登录
package com.softeem.ds;
import java.util.ArrayList;
public interface BaseManager {

   public boolean add(Object obj);

   public boolean del(Object obj);

   public boolean update(Object obj);

   public ArrayList findAll(Object obj);

   public Object findOne(Object obj);
}
package com.softeem.ds;

public class Daily {

   private int dno;       //编号
   private String content;   //内容
   private int starts;       //掌握程度 1:了解         2:熟练   3:精通
   private String ques;   //疑问
   private Student stu;   //日志提交人

   public Daily() {
       // TODO Auto-generated constructor stub
   }

   public Daily(int dno, String content, int starts, String ques, Student stu) {
       super();
       this.dno = dno;
       this.content = content;
       this.starts = starts;
       this.ques = ques;
       this.stu = stu;
   }

   public int getDno() {
       return dno;
   }

   public void setDno(int dno) {
       this.dno = dno;
   }

   public String getContent() {
       return content;
   }

   public void setContent(String content) {
       this.content = content;
   }

   public int getStarts() {
       return starts;
   }

   public void setStarts(int starts) {
       this.starts = starts;
   }

   public String getQues() {
       return ques;
   }

   public void setQues(String ques) {
       this.ques = ques;
   }

   public Student getStu() {
       return stu;
   }

   public void setStu(Student stu) {
       this.stu = stu;
   }

   @Override
   public String toString() {
       return "Daily [dno=" + dno + ", content=" + content + ", starts=" + starts + ", ques=" + ques + ", stu=" + stu.getSname()
               + "]";
   }

}
package com.softeem.ds;

import java.util.ArrayList;
import java.util.Objects;

public class DailyManager implements BaseManager {

   static ArrayList<Daily> dailys = new ArrayList<>();
   static int dno;

   /**
   * 日志添加
   */
   @Override
   public boolean add(Object obj) {
       Daily d = (Daily)obj;
       d.setDno(++dno);
       return dailys.add(d);
   }

   @Override
   public boolean del(Object obj) {
       // TODO Auto-generated method stub
       return false;
   }

   @Override
   public boolean update(Object obj) {
       //新日志内容，学号
       Daily d = (Daily)obj;
       for(Daily daily:dailys){
           if(Objects.equals(d.getStu().getSno(), daily.getStu().getSno())){
               daily.setContent(d.getContent());
               daily.setStarts(d.getStarts());
               daily.setQues(d.getQues());
               return true;
           }
       }

       return false;
   }

   /**
   * 查看当前登录学生提交的所有日志
   */
   @Override
   public ArrayList findAll(Object obj) {
       ArrayList list = new ArrayList();
       String sno = obj.toString();
       for (Daily daily : dailys) {
           if(Objects.equals(sno, daily.getStu().getSno())){
               list.add(daily);
           }
       }
       return list;
   }

   @Override
   public Object findOne(Object obj) {
       // TODO Auto-generated method stub
       return null;
   }

}
package com.softeem.ds;

import java.util.ArrayList;
import java.util.Scanner;

public class Main {

   static BaseManager sm = new StudentManager();
   static BaseManager dm = new DailyManager();
   static Student login;//记录当前登录学生

   public void enter(){
       menu1();
   }


   private void menu1() {
       p("**********SOFTEEM学员日志管理系统*********");
       p("*************【1】学员登录***************");
       p("*************【2】学员添加***************");
       p("*************【0】退出系统***************");
       p("*************************************");
       Scanner sc = new Scanner(System.in);
       int i = sc.nextInt();
       switch(i){
       case 1:
           login();
           break;
       case 2:
           register();
           break;
       case 0:
           p("谢谢使用，再见!!!");
           System.exit(0);
           default:
               System.err.println("指令错误，请重新输入");
               menu1();
               break;
       }
   }

   public void menu2(){
       p("**********SOFTEEM学员日志管理系统*********");
       p("*************【1】日志提交***************");
       p("*************【2】日志查看***************");
       p("*************【3】修改日志***************");
       p("*************【0】退出登录***************");
       p("*************************************");
       Scanner sc = new Scanner(System.in);
       int i = sc.nextInt();
       switch(i){
       case 1:
           dailyAdd();
           break;
       case 2:
           dailyShow();
           break;
       case 3:
           dailyUpdate();
           break;
       case 0:
           //将当前登录者置为空
           login = null;
           //返回上一级菜单
           menu1();
           break;
           default:
       }
   }

   private void dailyUpdate() {
       // TODO Auto-generated method stub

   }

   private void dailyShow() {
       for (Object obj : dm.findAll(login.getSno())) {
           p(obj);
       }
       menu2();
   }

   private void dailyAdd() {
       p("请输入日志信息(例如:日志内容(String)/掌握程度(int)/疑问(String)):");
       Scanner sc = new Scanner(System.in);
       String[] info = sc.nextLine().split("/");
       Daily d = new Daily(0, info[0], Integer.parseInt(info[1]), info[2], login);
       if(dm.add(d)){
           p("提交成功！");
       }else{
           p("提交失败！");
       }
       menu2();
   }

   /**
   * 学生登录
   */
   private void login() {
       p("请输入学号和密码(例如:001/123456)");
       Scanner sc = new Scanner(System.in);
       String[] info = sc.nextLine().split("/");
       //由于登录不需要姓名(根据学号密码)
       Student s = new Student(info[0],null,info[1]);
       Object obj = sm.findOne(s);
       if(obj != null){
           p("登录成功");
           login = (Student)obj;
           menu2();
       }else{
           p("账号或密码不正确,请重新输入");
           login();
       }
   }

   /**
   * 学员注册
   */
   private void register() {
       p("请输入学员信息(例如:001/张三风/123456)");
       Scanner sc = new Scanner(System.in);
       //读取一行输入文本同时截取
       String[] info = sc.nextLine().split("/");
       //根据截取的学生信息创建学生对象
       Student s = new Student(info[0],info[1],info[2]);
       if(sm.add(s)){
           p("添加成功!");
       }else{
           p("添加失败!");
       }
       menu1();
   }

   public void p(Object msg){
       System.out.println(msg);
   }

   public static void main(String[] args) {
       new Main().enter();
   }

}
package com.softeem.ds;

public class Student {

   String sno;       //学号
   String sname;   //姓名
   String pwd;       //密码

   public Student() {
       // TODO Auto-generated constructor stub
   }


   public Student(String sno, String sname, String pwd) {
       super();
       this.sno = sno;
       this.sname = sname;
       this.pwd = pwd;
   }

   public String getSno() {
       return sno;
   }
   public void setSno(String sno) {
       this.sno = sno;
   }
   public String getSname() {
       return sname;
   }
   public void setSname(String sname) {
       this.sname = sname;
   }
   public String getPwd() {
       return pwd;
   }
   public void setPwd(String pwd) {
       this.pwd = pwd;
   }

   @Override
   public String toString() {
       return "Student [sno=" + sno + ", sname=" + sname + ", pwd=" + pwd + "]";
   }

   @Override
   public int hashCode() {
       final int prime = 31;
       int result = 1;
       result = prime * result + ((pwd == null) ? 0 : pwd.hashCode());
       result = prime * result + ((sno == null) ? 0 : sno.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;
       Student other = (Student) obj;
       if (pwd == null) {
           if (other.pwd != null)
               return false;
       } else if (!pwd.equals(other.pwd))
           return false;
       if (sno == null) {
           if (other.sno != null)
               return false;
       } else if (!sno.equals(other.sno))
           return false;
       return true;
   }



}
package com.softeem.ds;

import java.util.ArrayList;
import java.util.Objects;

public class StudentManager implements BaseManager{

   static ArrayList<Student> stus = new ArrayList<>();

   @Override
   public boolean add(Object obj) {
       //判断当前添加的学生是否已经存在
       Student stu = (Student)obj;
       for(Student s:stus){
           if(Objects.equals(stu.getSno(), s.getSno())){
               //已存在
               return false;
           }
       }
       //加入集合
       return stus.add(stu);
   }

   @Override
   public boolean del(Object obj) {
       // TODO Auto-generated method stub
       return false;
   }

   @Override
   public boolean update(Object obj) {
       // TODO Auto-generated method stub
       return false;
   }

   @Override
   public ArrayList findAll(Object obj) {
       // TODO Auto-generated method stub
       return null;
   }

   //登录
   @Override
   public Object findOne(Object obj) {
       Student stu = (Student)obj;
       for(Student s:stus){
           //比较两个学生对象是否一致(学号和密码)
           if(Objects.equals(s, stu)){
               return s;
           }
       }
       return null;
   }

}
package com.softeem.ds;

public class Test {

   public static void main(String[] args) {
       StudentManager sm = new StudentManager();

       Student s1 = new Student("001", "狗蛋", "123");
       Student s2 = new Student("003", "旺财", "1234");
       Student s3 = new Student("004", "来福", "123456");


       boolean b1 = sm.add(s1);
       boolean b2 = sm.add(s2);
       boolean b3 = sm.add(s3);

       System.out.println("b1添加结果："+b1);
       System.out.println("b2添加结果："+b2);
       System.out.println("b3添加结果："+b3);

       Student s = new Student("003", "旺财", "1234");
       System.out.println(sm.findOne(s));
   }

}