Java小型管理系统，文章中有源码，适合作为课程作业，个人小项目（中等）

Bills.java

package cn.tx1;/** * ID  类别  账户  类型   余额  时间  备注 */public class Bills {    private String name;    private String account;    private String type;    private double total;    private String time;    private String desc;    //全参构造器    public Bills(String name, String account, String type, double total, String time, String desc) { this.name = name; this.account = account; this.type = type; this.total = total; this.time = time; this.desc = desc;    }    //无参构造器    public Bills() {    }    public String getName() { return name;    }    public void setName(String name) { this.name = name;    }    public String getAccount() { return account;    }    public void setAccount(String account) { this.account = account;    }    public String getType() { return type;    }    public void setType(String type) { this.type = type;    }    public double getTotal() { return total;    }    public void setTotal(double total) { this.total = total;    }    public String getTime() { return time;    }    public void setTime(String time) { this.time = time;    }    public String getDesc() { return desc;    }    public void setDesc(String desc) { this.desc = desc;    }}

MainMenu.java

package cn.tx1;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.*;import java.util.stream.Collectors;import java.util.stream.Stream;public class MainMenu {    //创建一个集合来存储    static List<Bills> billsList=new ArrayList<>();    //静态代码块，类加载的时候第一时间执行   “果然还是用到了”    static { //String name, String account, String type, double total, String time, String desc billsList.add(new Bills("吃饭支出","建设银行","支出",122247,"2022-1-1","家庭聚餐")); billsList.add(new Bills("吃饭支出","农业银行","支出",111222,"2021-12-11","家庭聚餐")); billsList.add(new Bills("工资收入","农商银行","收入",927227,"2021-11-1","发工资")); billsList.add(new Bills("交通支出","交通银行","支出",999247,"2021-1-1","交通支出")); billsList.add(new Bills("买气球","建设银行","支出",222147,"2025-1-1","买气球")); billsList.add(new Bills("奖金收入","投资银行","收入",908227,"2021-1-1","奖金"));    }    public static void showMain(){ System.out.println("--------随手记---------"); System.out.println("1、添加账务  2、删除帐务  3、查询账务  4、退出系统"); System.out.println("请输入功能序号【1-4】：");    }    public static void main(String[] args) { run();    }    public static void run(){ showMain(); //创建一个flag标志,循环条件，变量存在 boolean flag=true; //创建扫描器 Scanner sc=new Scanner(System.in); //获得输入的选项 while (flag){     int num=sc.nextInt();     //判断1、2、3、4     switch (num){  case 1:      addBills();      break;  case 2:      delBills();      break;  case 3:      select();      break;  case 4:      flag=false;      break;  default:      System.out.println("请重新输入选项：");     } } System.out.println("退出系统,拜拜！");    }    private static void delBills() { Scanner sc2=new Scanner(System.in); int id= sc2.nextInt(); billsList.remove(id-1); System.out.println("删除成功！！"); showMain();    }    private static void addBills() { Scanner sc2=new Scanner(System.in); Bills bills=new Bills(); System.out.println("请输入类别："); bills.setName(sc2.next()); System.out.println("请输入账户："); bills.setAccount(sc2.next()); System.out.println("请输入收入支出类型："); bills.setType(sc2.next()); System.out.println("请输入金额：："); bills.setTotal(sc2.nextInt()); System.out.println("请输入时间："); bills.setTime(sc2.next()); System.out.println("请输入备注："); bills.setDesc(sc2.next()); billsList.add(bills); System.out.println("财务添加成功！");    }    /**     * 三种查询     *   1、查询所有     *   2、按照时间区间来查询     *   3、按照收入和支出的类型来查询     */    private static void select(){ System.out.println("随手记>>账务查询"); System.out.println("1、查询所有   2、按照时间区间来查询    3、按照收入和支出的类型来查询"); //创建扫描器 Scanner sc1=new Scanner(System.in); int num=sc1.nextInt(); switch (num){     case 1:  selectAll();  break;     case 2:  selectByData();  break;     case 3:  selectByType();  break;//     default://  System.out.println("亲，请重新输入选项："); } //展示上一级的主菜单 showMain();    }    private static void selectAll(){ System.out.println("查询所有"); print(billsList);    }    private static void selectByData(){ //创建一个时间格式化对象      [格式化器] SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd"); System.out.println("按照时间查询"); System.out.println("随手记>>账务查询>>按照时间查询"); //创建扫描器 Scanner sc1=new Scanner(System.in); System.out.println("请输入开始时间："); String start=sc1.next(); System.out.println("请输入结束时间："); String end=sc1.next(); //stream 流 List<Bills> billsList1 = billsList.stream().filter(bills -> {     String time = bills.getTime();     //把字符串解析成具体时间     try {  Date startData = format.parse(start);  Date endData = format.parse(end);  Date timeData = format.parse(time);  if (timeData.before(endData) && timeData.after(startData)) {      return true;  }     } catch (ParseException e) {  e.printStackTrace();     }     return false; }).collect(Collectors.toList()); print(billsList1);    }    private static void selectByType(){ System.out.println("按照类型查询"); System.out.println("随手记>>账务查询>>收入和支出类型"); System.out.println("请输入   收入或者支出"); //创建扫描器 Scanner sc1=new Scanner(System.in); String type=sc1.next(); //收入还是支出 //筛选一下集合中type时支出的元素    stream筛选   collectCollectors.toList():将流转换为集合 List<Bills> billsList1 = billsList.stream().filter(bills -> {     String type1 = bills.getType();     return type1.equals(type); }).collect(Collectors.toList()); print(billsList1); //filter 过滤    true要，false不要// stream.filter(bills -> {//    String type1= bills.getType();//    return type1.equals(type);// });    }    public static void print(List<Bills> billsList){ System.out.println("ID\t\t类别\t\t\t账户\t\t\t类型\t\t金额\t\t\t\t时间\t\t\t\t备注"); for (int i = 0; i < billsList.size(); i++) {     Bills bills1=billsList.get(i);     System.out.println(i+1+"\t\t"+bills1.getName()+"\t\t"+bills1.getAccount()+"\t\t"+bills1.getType()     +"\t\t"+bills1.getTotal()+"\t\t"+bills1.getTime()+"\t\t"+bills1.getDesc()); }    }}

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