用java操作MySQL编写的高校水电费管理系统

本系统需要使用MySQL的java驱动包，这个包可以在网站下载，具体安装方法不同的编译器不同，这个需要另行进行搜索，下面是具体的代码实现：

1.连接MySQL

package cn.com.Universty;

import java.sql.*;

public class MySQLConnection {
    public static final String DRIVER = "com.mysql.cj.jdbc.Driver";//设置driver
    public static final String URL = "jdbc:mysql://localhost:3306/university";//设置连接端口和数据库名
    public static final String USER = "root";//设置数据库的用户名
    public static final String PASSWORD = "123456789";//设置数据库的密码

   public static Connection getConnection(){//设置连接函数
       Connection connection = null;
       try {
           Class.forName(DRIVER);
       } catch (ClassNotFoundException e) {
           e.printStackTrace();
       }
       try {
           connection = DriverManager.getConnection(URL,USER,PASSWORD);//建立连接
       } catch (SQLException e) {
           e.printStackTrace();
       }
       return connection;
   }

    public static void close(Connection conn) throws SQLException {
        if (conn != null){
            conn.close();
        }
    }

    public static void close(PreparedStatement pstmt) throws SQLException {
        if (pstmt != null){
            pstmt.close();
        }
    }

    public static void close(Statement stmt) throws SQLException {
        if (stmt != null){
            stmt.close();
        }
    }

    public static void  close(ResultSet rs) throws SQLException {
        if (rs != null){
            rs.close();
        }
    }


}

2.设置Student

package cn.com.Universty;

import java.io.Serializable;
import java.util.Objects;

public  class  Student implements Serializable {//toString这个方法很重要
    private long   snum;

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Student student = (Student) o;
        return snum == student.snum &&
                sage == student.sage &&
                Double.compare(student.select, select) == 0 &&
                Double.compare(student.swater, swater) == 0 &&
                sname.equals(student.sname) &&
                ssex.equals(student.ssex) &&
                sclass.equals(student.sclass) &&
                secost.equals(student.secost) &&
                swcost.equals(student.swcost);
    }

    @Override
    public int hashCode() {
        return Objects.hash(snum, sname, ssex, sage, sclass, select, swater, secost, swcost);
    }

    private String sname;
    private String ssex;

    @Override
    public String toString() {
        return "Student{" +
                "snum=" + snum +
                ", sname='" + sname + '\'' +
                ", ssex='" + ssex + '\'' +
                ", sage=" + sage +
                ", sclass='" + sclass + '\'' +
                ", select=" + select +
                ", swater=" + swater +
                ", secost='" + secost + '\'' +
                ", swcost='" + swcost + '\'' +
                '}';
    }

    private int sage;
    private String sclass;
    private double select;
    private double swater;
    private String secost;
    private String swcost;
    public long getSnum() {
        return snum;
    }

    public void setSnum(long snum) {
        this.snum = snum;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getSsex() {
        return ssex;
    }

    public void setSsex(String ssex) {
        this.ssex = ssex;
    }

    public int getSage() {
        return sage;
    }

    public void setSage(int sage) {
        this.sage = sage;
    }

    public String getSclass() {
        return sclass;
    }

    public void setSclass(String sclass) {
        this.sclass = sclass;
    }

    public double getSelect() {
        return select;
    }

    public void setSelect(double select) {
        this.select = select;
    }

    public double getSwater() {
        return swater;
    }

    public void setSwater(double swater) {
        this.swater = swater;
    }

    public String getSecost() {
        return secost;
    }

    public void setSecost(String secost) {
        this.secost = secost;
    }

    public String getSwcost() {
        return swcost;
    }

    public void setSwcost(String swcost) {
        this.swcost = swcost;
    }


}

3.用Java对MySQL进行数据的增删改查

package cn.com.Universty;

import java.sql.*;
import java.util.ArrayList;

public class MySQLUse {

    public static String MadeString(Student student){//原始的建立MySQL的语句的方式
        String sql = "insert into Student values("+student.getSnum()+",\'"+student.getSname()+"\',\'"+student.getSsex()+"\',"+student.getSage()+",\'"+student.getSclass()+"\',"+student.getSelect()+","+student.getSwater()+",\'"+student.getSecost()+"\',\'"+student.getSwcost()+"\')";
        return sql;
    }


    public static int Add(Student student){//向数据库中添加数据的方法
        int a=0;
        Connection connection;
        connection = MySQLConnection.getConnection();//连接数据库
        try {
            if (connection.isClosed())
                System.out.println("增加数据时数据库连接失败！！！");
            Statement statement = connection.createStatement();
            String sql = MadeString(student);
            //System.out.println(sql);
            if (statement.executeUpdate(sql)!=0)//判断数据库的语言是否已经执行
            {System.out.println("插入成功！");a=1;}
            else
            { System.out.println("插入失败！");a=0;}
            MySQLConnection.close(statement);
            MySQLConnection.close(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return a;
    }

    public static int Delete(long student){//以学号为媒介删除；
        int a=0;

        Connection connection;
        connection = MySQLConnection.getConnection();
        try {
            if (connection.isClosed()){
                System.out.println("删除数据时数据库连接失败！！！");
            }
            Statement statement = connection.createStatement();
            String sql = "delete from Student where snum="+student;
            if (statement.executeUpdate(sql)!=0){
                System.out.println("删除成功！");a=1;
            }
            else
            {
                System.out.println("删除失败！");a=0;
            }
            MySQLConnection.close(statement);
            MySQLConnection.close(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return a;
    }

    public static int Delete(String string){//以名字为媒介删除；
        int a=0;
        Connection connection;
        connection = MySQLConnection.getConnection();
        try {
            if (connection.isClosed()){
                System.out.println("删除数据时数据库连接失败！！！");
            }
            Statement statement = connection.createStatement();
            String sql = "delete from Student where sname='%s'";
            //PreparedStatement ps = connection.prepareStatement(sql);
            //ps.setString(1,string);
            //System.out.println(ps.getResultSet());
            //String str = ps.toString();
            //System.out.println(ps.toString());
            //ResultSet rs = ps.executeQuery();
            if (statement.executeUpdate(String.format(sql,string))!=0){
                System.out.println("删除成功！");a=1;
            }
            else
            {
                System.out.println("删除失败！");a=0;
            }
            MySQLConnection.close(statement);
            MySQLConnection.close(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        }

        return a;
    }

   public static Student Select(long id){//以学号为媒介进行查看数据
        Student student = new Student();
        Connection connection;
        connection = MySQLConnection.getConnection();
        try {
            if (connection.isClosed()){
                System.out.println("查询数据库内容时连接数据库失败！！！");
            }
            Statement statement = connection.createStatement();
            String sql = "select * from Student where snum=?";//采用PreparedStatement进行占位
            PreparedStatement ps = connection.prepareStatement(sql);
            ps.setLong(1,id);
            ResultSet rs = ps.executeQuery();
            while (rs.next()){
                Student stu = new Student();
                stu.setSnum(rs.getLong("snum"));
                //System.out.print(stu.getSnum()+"\t");
                stu.setSname(rs.getString("sname"));
                //System.out.print(stu.getSname()+"\t");
                stu.setSsex(rs.getString("ssex"));
                //System.out.print(stu.getSsex()+"\t");
                stu.setSage(rs.getInt("sage"));
                //System.out.print(stu.getSage()+"\t");
                stu.setSclass(rs.getString("sclass"));
                //System.out.print(stu.getSclass()+"\t");
                stu.setSelect(rs.getDouble("selec"));
                //System.out.print(stu.getSelect()+"\t");
                stu.setSwater(rs.getDouble("swater"));
                //System.out.print(stu.getSwater()+"\t");
                stu.setSecost(rs.getString("secost"));
                //System.out.print(stu.getSecost()+"\t");
                stu.setSwcost(rs.getString("swcost"));
                //System.out.print(stu.getSwcost());
                student=stu;
            }
            MySQLConnection.close(rs);
            MySQLConnection.close(ps);
            MySQLConnection.close(statement);
            MySQLConnection.close(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return student;
    }

    public static  ArrayList<Student>  Select(){//以列表的方式进行提取所有数据库中的信息
        ArrayList<Student> students = new ArrayList<>();
        Connection connection;
        connection = MySQLConnection.getConnection();
        try {
            if (connection.isClosed()){
                System.out.println("查寻数据库时连接数据库失败！！！");
            }
            Statement statement = connection.createStatement();
            String sql = "select * from Student ";
            ResultSet rs = statement.executeQuery(sql);
            while (rs.next()){
                Student student = new Student();
                student.setSnum(rs.getLong("snum"));
                student.setSname(rs.getString("sname"));
                student.setSsex(rs.getString("ssex"));
                student.setSclass(rs.getString("sclass"));
                student.setSage(rs.getInt("sage"));
                student.setSelect(rs.getDouble("selec"));
                student.setSwater(rs.getDouble("swater"));
                student.setSecost(rs.getString("secost"));
                student.setSwcost(rs.getString("swcost"));
                students.add(student);
            }
            MySQLConnection.close(rs);
            MySQLConnection.close(statement);
            MySQLConnection.close(connection);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        //System.out.println(students);
        return students;
    }

    public static int Update(long id,Student student) {//更新数据库中的数据，采用的是以学号为媒介先删除原有的再添加修改后的
        int a = 0,b = 0,c = 0;
        b = Delete(id);

        if (b == 1 ){
            a = 1;
            c = Add(student);
            if ( c ==0) {
                a = 0;
                System.out.println("修改学生信息时增加更新信息失败! !");
            }
        }else System.out.println("删除信息失败");


        return a;
    }

}

4.设计系统的主体部分

package cn.com.Universty;

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

public class StudentControl {

    public static void StudentSet(ArrayList<Student> list){//向数据库中添加数据
        Student student = new Student();
        Scanner scanner = new Scanner(System.in);
        int i=0;
       // Boolean bool = false;
        System.out.println("=====================欢迎来到学生信息添加系统====================");
        System.out.print("请输入学生的学号：");
        student.setSnum(scanner.nextLong());
       for (i=0;i<list.size();i++){
           if (list.get(i).getSnum()==student.getSnum()){//判断键入的学号原有数据库中是否已存在
               //bool=true;
               System.out.print("学号已存在，请重新输入：");
               student.setSnum(scanner.nextLong());
               //i=0;
              // continue;
           }

       }
       //if ()
        System.out.print("请输入学生的姓名：");
        student.setSname(scanner.next());
        do {
            System.out.print("请输入学生的性别：");
            student.setSsex(scanner.next());
        }while (!student.getSsex().equals("男")&&!student.getSsex().equals("女"));
        System.out.print("请输入学生的年龄: ");
        student.setSage(scanner.nextInt());
        System.out.print("请输入学生的班级: ");
        student.setSclass(scanner.next());
        System.out.print("请输入学生的用电量(度)：");
        student.setSelect(scanner.nextDouble());
        do {
            System.out.print("该学生是否已经缴纳电费(填“是”或“否”):");
            student.setSecost(scanner.next());
        }while (!student.getSecost().equals("是")&&!student.getSecost().equals("否"));
        System.out.print("请输入学生的用水量(吨)：");
        student.setSwater(scanner.nextDouble());
        do {
            System.out.print("请输入学生是否缴纳水费：");
            student.setSwcost(scanner.next());
        }while (!student.getSwcost().equals("是")&&!student.getSwcost().equals("否"));
        MySQLUse.Add(student);
    }

    public static void StudentGetAll(ArrayList<Student> list){//输出所有的数据库中的信息
        int i=0;
        System.out.println("学生信息如下：");
        System.out.print("学号\t");
        System.out.print("姓名\t");
        System.out.print("性别\t");
        System.out.print("年龄\t");
        System.out.print("班级\t");
        System.out.print("用电量(度)\t");
        System.out.print("电费缴纳情况\t");
        System.out.print("用水量(吨)\t");
        System.out.print("水费缴纳情况\t");
        System.out.println();

        for (i=0;i<list.size();i++){
            System.out.print(list.get(i).getSnum());System.out.print("\t");
            System.out.print(list.get(i).getSname());System.out.print("\t");
            System.out.print(list.get(i).getSsex());System.out.print("\t");
            System.out.print(list.get(i).getSage());System.out.print("\t");
            System.out.print(list.get(i).getSclass());System.out.print("\t");
            System.out.print(list.get(i).getSelect());System.out.print("\t");
            System.out.print(list.get(i).getSecost());System.out.print("\t");
            System.out.print(list.get(i).getSwater());System.out.print("\t");
            System.out.print(list.get(i).getSwcost());System.out.print("\t");
            System.out.println();

        }
    }


    public static void StudentGetOne(Long num){//以学号为媒介进行查找学生信息
        Student student = new Student();
        student = MySQLUse.Select(num);
        if (student==null) {
            System.out.println("查无此人!!");
        }
         else   {
            System.out.println("学生信息如下：");
            System.out.print("学号\t");
            System.out.print("姓名\t");
            System.out.print("性别\t");
            System.out.print("年龄\t");
            System.out.print("班级\t");
            System.out.print("用电量(度)\t");
            System.out.print("电费缴纳情况\t");
            System.out.print("用水量(吨)\t");
            System.out.print("水费缴纳情况\t");
            System.out.println();
            System.out.print(student.getSnum());
            System.out.print("\t");
            System.out.print(student.getSname());
            System.out.print("\t");
            System.out.print(student.getSsex());
            System.out.print("\t");
            System.out.print(student.getSage());
            System.out.print("\t");
            System.out.print(student.getSclass());
            System.out.print("\t");
            System.out.print(student.getSelect());
            System.out.print("\t");
            System.out.print(student.getSecost());
            System.out.print("\t");
            System.out.print(student.getSwater());
            System.out.print("\t");
            System.out.print(student.getSwcost());
            System.out.print("\t");
            System.out.println();
        }
    }

    public static void StudentGetOne(String sname){//以姓名为媒介进行查找数据库中的信息
        ArrayList<Student> list = new ArrayList<>();
        list = MySQLUse.Select();
        int i = 0;
        System.out.print("学号\t");
        System.out.print("姓名\t");
        System.out.print("性别\t");
        System.out.print("年龄\t");
        System.out.print("班级\t");
        System.out.print("用电量(度)\t");
        System.out.print("电费缴纳情况\t");
        System.out.print("用水量(吨)\t");
        System.out.print("水费缴纳情况\t");
        System.out.println();
        for (i=0;i<list.size();i++){

            if (list.get(i).getSname().equals(sname)){

                System.out.print(list.get(i).getSnum());System.out.print("\t");
                System.out.print(list.get(i).getSname());System.out.print("\t");
                System.out.print(list.get(i).getSsex());System.out.print("\t");
                System.out.print(list.get(i).getSage());System.out.print("\t");
                System.out.print(list.get(i).getSclass());System.out.print("\t");
                System.out.print(list.get(i).getSelect());System.out.print("\t");
                System.out.print(list.get(i).getSecost());System.out.print("\t");
                System.out.print(list.get(i).getSwater());System.out.print("\t");
                System.out.print(list.get(i).getSwcost());System.out.print("\t");
                System.out.println();
            }

        }
    }

    public static void StudentSesrch(){//查询系统
        Scanner scanner = new Scanner(System.in);int choice;
        while (true) {
            System.out.println("*************欢迎来到查询系统****************");
            System.out.println("**************1.学号查询********************");
            System.out.println("**************2.姓名查询********************");
            System.out.println("**************3.用电量查询******************");
            System.out.println("**************4.用水量查询******************");
            System.out.println("**************0.退出查询系统****************");
            System.out.print("请输入要执行的操作指令代码(1、2、3、4、0): ");
            choice = scanner.nextInt();
            while (true) {
                if (choice != 1 && choice != 2 && choice != 3 && choice != 4 && choice != 0) {
                    System.out.print("输入指令错误，请重新输入：");
                    choice = scanner.nextInt();
                    //continue;
                } else
                    break;
            }
            if (choice == 0){
                break;
            }
            else if (choice == 1){
                long snum;
                System.out.print("请输入要查询的学生的学号：");
                snum = scanner.nextLong();
                StudentGetOne(snum);
            }
            else if (choice == 2){
                String sname;
                System.out.print("请输入要查询的学生的姓名:");
                sname = scanner.next();
                StudentGetOne(sname);
            }
            else if (choice == 3){
                System.out.print("请输入学生的学号：");
                long snum;
                snum = scanner.nextLong();
                Student student = new Student();
                student = MySQLUse.Select(snum);
                System.out.println(student.getSname()+"的用电量为："+student.getSelect());
                if (student.getSecost().equals("否")){
                    System.out.println("还未交电费，请及时缴纳！");
                }else
                    System.out.println("已缴纳电费。");
            }
            else if (choice == 4){
                System.out.print("请输入要查询学生的学号：");
                long sum;
                sum = scanner.nextLong();
                Student student = new Student();
                student = MySQLUse.Select(sum);
                System.out.println(student.getSname()+"的用水量为："+student.getSwater());
                if (student.getSwcost().equals("否")){
                    System.out.println("还未交水费，请及时缴纳！");
                }else
                    System.out.println("水费已缴纳。");
            }

        }
    }

    public static void StudentChange(){//修改信息
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要修改的学生的学号: ");
        long snum;
        snum = scanner.nextLong();
        Student student = new Student();
        System.out.print("输入修改后的学号：");
        student.setSnum(scanner.nextLong());
        System.out.print("输入修改后的姓名：");
        student.setSname(scanner.next());
        System.out.print("输入修改后的性别：");
        student.setSsex(scanner.next());
        System.out.print("输入修改后的年龄：");
        student.setSage(scanner.nextInt());
        System.out.print("输入修改后的班级：");
        student.setSclass(scanner.next());
        System.out.print("输入修改后的用电量(度)：");
        student.setSelect(scanner.nextDouble());
        System.out.print("输入修改后的电费缴纳情况: ");
        do {
            student.setSecost(scanner.next());
        }while (!student.getSecost().equals("是")&&!student.getSecost().equals("否"));
        System.out.print("输入修改后的用水量(吨): ");
        student.setSwater(scanner.nextDouble());
        System.out.print("输入修改后的水费缴纳情况：");
        do {
            student.setSwcost(scanner.next());
        }while (!student.getSwcost().equals("是")&&!student.getSwcost().equals("否"));
        int a = 0;
        a = MySQLUse.Update(snum,student);
        if (a==1){
            System.out.println("修改成功！");
        }else
            System.out.println("修改失败！");
    }

    public static void StudentDelete(){//删除学生信息
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要删除人的学号：");
        long snum;
        snum = scanner.nextLong();
        int a =0;
        a = MySQLUse.Delete(snum);
        if (a==1){
            System.out.println("删除成功！");
        }
        else
            System.out.println("删除失败！");
    }

    public static void StudentCount() {//信息统计
        Scanner scanner = new Scanner(System.in);
        int choice;
        double useelec=0,arrangeuseelec=0,usewater=0,arrangeusewater=0;//依次是电量使用、平均电量、用水量、平均水量
        ArrayList<Student> list = new ArrayList<>();
        list = MySQLUse.Select();
        while (true) {
            System.out.println("********************欢迎来到统计系统******************");
            System.out.println("********************1.统计用电量*********************");
            System.out.println("********************2.统计用水量*********************");
            System.out.println("********************3.统计电费***********************");
            System.out.println("********************4.统计水费***********************");
            System.out.println("********************0.退出统计系统*******************");
            System.out.print("请输入你要执行的操作：");
            choice = scanner.nextInt();
            while (true) {
                if (choice != 1 && choice != 2 && choice != 3 && choice != 4 && choice != 0) {
                    System.out.print("输入指令错误，请重新输入：");
                    choice = scanner.nextInt();
                    //continue;
                } else break;
            }
            if (choice == 0) {
                break;
            }
            else if (choice == 1){
                int i = 0,upeople=0,downpeople=0,equalpeople=0;
                for (i=0;i<list.size();i++){
                    useelec+=list.get(i).getSelect();
                    //i++;
                }
                arrangeuseelec=useelec/i;
                //i=0;
                for (i=0;i<list.size();i++){
                    if (list.get(i).getSelect()>arrangeuseelec){
                        upeople++;
                    }
                    else if (list.get(i).getSelect()==arrangeuseelec){
                        equalpeople++;
                    }
                    else if (list.get(i).getSelect()<arrangeuseelec){
                        downpeople++;
                    }
                    //i++;
                }
                System.out.println("用电量情况统计如下：");
                System.out.println("------------------------------");
                System.out.println("|       总用电量         |"+useelec+"度");
                System.out.println("|       平均用电量       |"+arrangeuseelec+"度");
                System.out.println("|  超过平均用电量的人数   |"+upeople+"人");
                System.out.println("|  等于平均用电量的人数   |"+equalpeople+"人");
                System.out.println("|  低于平均用电量的人数   |"+downpeople+"人");
                System.out.println("------------------------------");
            }
            else if (choice == 2){
                int i = 0,upeople=0,downpeople=0,equalpeople=0;
                for (i=0;i<list.size();i++){
                    usewater+=list.get(i).getSwater();
                    //i++;
                }
                arrangeusewater=usewater/i;
               // i=0;
                for (i=0;i<list.size();i++){
                    if (list.get(i).getSwater()>arrangeusewater){
                        upeople++;
                    }
                    else if (list.get(i).getSwater()==arrangeusewater){
                        equalpeople++;
                    }
                    else if (list.get(i).getSwater()<arrangeusewater){
                        downpeople++;
                    }
                    //i++;
                }
                System.out.println("用水量情况统计如下：");
                System.out.println("------------------------------");
                System.out.println("|       总用水量         |"+useelec+"吨");
                System.out.println("|       平均用水量       |"+arrangeuseelec+"吨");
                System.out.println("|  超过平均用水量的人数   |"+upeople+"人");
                System.out.println("|  等于平均用水量的人数   |"+equalpeople+"人");
                System.out.println("|  低于平均用水量的人数   |"+downpeople+"人");
                System.out.println("------------------------------");
            }
            else if (choice == 3){
                double price;
                double free;
                double cost=0;
                int sum1=0,sum2=0,i=0;//sum1为已缴纳人数,sum2为未缴纳人数
                System.out.println("请输入电费价格(度/元): ");
                price = scanner.nextDouble();
                System.out.println("请输入免费额度(度): ");
                free = scanner.nextDouble();
                for (i=0;i<list.size();i++){
                    if (list.get(i).getSelect()<=free){
                        cost+=0;
                        sum1++;
                    }else if (list.get(i).getSelect()>free){
                        cost += (list.get(i).getSelect()-free)*price;
                        if (list.get(i).getSecost().equals("是")){
                            sum1++;
                        }else sum2++;
                    }
                    //i++;
                }
                System.out.println("已缴纳人数为: "+sum1);
                System.out.println("未缴纳人数为："+sum2);
            }
            else if (choice==4){
                double price;
                double free;
                double cost=0;
                int sum1=0,sum2=0,i=0;//sum1为已缴纳人数,sum2为未缴纳人数
                System.out.println("请输入水费价格(吨/元): ");
                price = scanner.nextDouble();
                System.out.println("请输入免费额度(吨): ");
                free = scanner.nextDouble();
                for (i=0;i<list.size();i++){
                    if (list.get(i).getSwater()<=free){
                        cost+=0;
                        sum1++;
                    }else if (list.get(i).getSwater()>free){
                        cost += (list.get(i).getSwater()-free)*price;
                        if (list.get(i).getSwcost().equals("是")){
                            sum1++;
                        }else sum2++;
                    }
                   // i++;
                }
                System.out.println("已缴纳人数为: "+sum1);
                System.out.println("未缴纳人数为："+sum2);
            }
        }
    }

    public static void MadeStudent(){//学生信息操作总界面
        Scanner scanner = new Scanner(System.in);
        int choice ;
        ArrayList<Student> list = new ArrayList<>();
        list=null;
        while (true) {
            System.out.println("******************学生水电费管理系统************************");
            System.out.println("******************1.学生信息录入***************************");
            System.out.println("******************2.全部学生信息查询************************");
            System.out.println("******************3.单个学生信息查询************************");
            System.out.println("******************4.学生信息删除系统************************");
            System.out.println("******************5.学生信息修改系统************************");
            System.out.println("******************6.学生信息统计系统*************************");
            System.out.println("******************0.退出管理系统*****************************");
            System.out.print("请输入操作代码：");
            choice = scanner.nextInt();
            while (true) {
                if (choice != 1 && choice != 2 && choice != 3 && choice != 4 &&choice != 5 && choice != 6 && choice != 0) {
                    System.out.print("输入指令错误，请重新输入：");
                    choice = scanner.nextInt();
                    //continue;
                } else
                    break;
            }
            if (choice == 0){
                break;
            }else if (choice ==1 ){
                list=MySQLUse.Select();
                StudentSet(list);
            }
            else if (choice == 2){
                list = MySQLUse.Select();
                StudentGetAll(list);
            }else if (choice == 3){
                StudentSesrch();
            }else if (choice == 4){
                StudentDelete();
            }else if (choice == 5){
                StudentChange();
            }else if (choice == 6){
                StudentCount();
            }
        }
    }

    }

5.执行部分

package cn.com.Universty;

public class StudentUse {
    public static void main(String[] args) {//执行语句
        StudentControl.MadeStudent();
    }
}