java数组学生成绩管理源代码

java学生管理系统大作业代码Java学生管理系统是一个基于Java语言开发的学生信息管理系统，用于方便学校教务人员进行学生信息的管理和查询。

以下是该系统的代码实现。

1. 登录界面代码实现该界面是用户登录的入口，用户需要输入用户名和密码才能进入系统。

```javaimport javax.swing.*;import java.awt.*;import java.awt.event.*;public class Login extends JFrame implements ActionListener {JLabel lb1, lb2, lb3;JTextField txtName;JPasswordField txtPwd;JButton btnOK, btnCancel;String userName = "admin";// 默认用户名String password = "123456";// 默认密码public Login() {setTitle("学生信息管理系统登录");// 设置窗体标题setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 设置窗体关闭方式setSize(350, 200);// 设置窗体大小setLocationRelativeTo(null);// 设置居中显示setLayout(new BorderLayout());JPanel pNorth = new JPanel();lb1 = new JLabel("欢迎使用学生信息管理系统", JLabel.CENTER); lb1.setFont(new Font("微软雅黑", Font.BOLD, 20));pNorth.add(lb1);add(pNorth, BorderLayout.NORTH);JPanel pCenter = new JPanel();pCenter.setLayout(new GridLayout(3, 2));lb2 = new JLabel("用户名:", JLabel.RIGHT);pCenter.add(lb2);txtName = new JTextField(20);pCenter.add(txtName);lb3 = new JLabel("密码:", JLabel.RIGHT);pCenter.add(lb3);txtPwd = new JPasswordField(20);txtPwd.setEchoChar('*');// 设置密码框的回显字符pCenter.add(txtPwd);btnOK = new JButton("登录");pCenter.add(btnOK);btnCancel = new JButton("取消");pCenter.add(btnCancel);add(pCenter, BorderLayout.CENTER);btnOK.addActionListener(this);btnCancel.addActionListener(this);setVisible(true);// 显示窗体}public void actionPerformed(ActionEvent e) {if (e.getSource() == btnOK) {String name = txtName.getText();// 获取用户名String password = new String(txtPwd.getPassword());// 获取密码 if (name.equals(userName) && password.equals(password)) {setVisible(false);new MainFrame();} else {JOptionPane.showMessageDialog(Login.this, "用户名或密码错误！", "登录失败", JOptionPane.ERROR_MESSAGE);}} else if (e.getSource() == btnCancel) {txtName.setText("");txtPwd.setText("");}}public static void main(String[] args) {new Login();}}```2. 主界面代码实现该界面是系统的主界面，包含了菜单栏、工具栏和表格显示区域。

目录1.Client.java (2)2.LoginGUI.java (2)3.AdminGUI.java (6)4.StudentGUI.java (14)5.Select.java (17)6.UpdateAndInsert.java (24)7.Delete.java (27)8.Student.java (29)9.Administrator.java (31)1.Client.java/*程序入口*/package ms;public class Client{public static void main(String[] args){LoginGUI lg=new LoginGUI();lg.login();}}2.LoginGUI.java/*登陆主窗口*/package ms;import java.awt.BorderLayout;import java.awt.Choice;import java.awt.GridLayout;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;public class LoginGUI{JFrame log=null; //登陆主窗口JPanel jPanel1=null; //用于存放用户名、密码、登录方式标签JPanel jPanel2=null; //用于存放用户名、密码输入框和登录方式选择框JPanel jPanel3=null; //用于存放登陆、退出按钮JLabel jLabel1=null; //用于存放用户名标签JLabel jLabel2=null; //用于存放密码标签JLabel jLabel3=null; //用于存放登录方式标签JLabel jLabel4=null; //学生管理系统登陆标签TextField t1=null; //用于存放用户名输入TextField t2=null; //用于存放密码输入Choice c=null; //用于存放登录方式选择JButton jB1=null; //登陆按钮JButton jB2=null; //退出按钮String UserName=null; //存放用户输入的用户名String UserPassword=null; //存放用户输入的密码int UserLimit=-1; //存放用户选择登陆权限public LoginGUI(){super();this.log = new JFrame("学生学籍管理系统");this.jPanel1=new JPanel();this.jPanel2=new JPanel();this.jPanel3=new JPanel();jLabel1=new JLabel("用户名");jLabel2=new JLabel("密码");jLabel3=new JLabel("登录方式");jLabel4=new JLabel(new ImageIcon("image/login.jpg"));t1=new TextField();t2=new TextField();c=new Choice(); //创建一个登录方式下拉选择框c.add("学生登陆");c.add("管理员登陆");jB1=new JButton("登陆"); //创建登陆按钮jB2=new JButton("退出"); //创建退出按钮}public void login(){BorderLayout border=new BorderLayout();border.setVgap(15);border.setHgap(10);log.setLayout(border); //设置登陆主窗口布局管理器为BorderLayoutlog.add(jPanel1, BorderLayout.WEST);log.add(jPanel2, BorderLayout.CENTER);log.add(jPanel3, BorderLayout.SOUTH);log.add(jLabel4,BorderLayout.NORTH);jPanel1.setLayout(new GridLayout(3,1,30,20)); //3行1列jPanel2.setLayout(new GridLayout(3,1,30,20));jPanel3.setLayout(new GridLayout(1,2,10,30));jPanel1.add(jLabel1); //添加三个标签用户名、密码、登陆方式jPanel1.add(jLabel2);jPanel1.add(jLabel3);jPanel2.add(t1); //添加用户名、密码输入文本框登陆方式选择框jPanel2.add(t2);jPanel2.add(c);jPanel3.add(jB1); //添加两个按钮jPanel3.add(jB2);jB1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){erName=LoginGUI.this.t1.getText();erPassword=LoginGUI.this.t2.getText();erLimit=LoginGUI.this.c.getSelectedIndex();if(erLimit==0){StudentGUI ll=new StudentGUI(LoginGUI.this.log,erName);Select sel=new Select();sel.setStudentList();for(int i=0;i<sel.getStudentAllId().size();i++){if(sel.getStudentAllId().get(i).toString().equals(erNa me)&&sel.getStudentAllPassword().get(i).equals(erPass word)){log.setVisible(false);ll.studentGo();}else if(i==sel.getStudentAllId().size()-1){JOptionPane.showMessageDialog(LoginGUI.this.log,"用户名密码错误");}}}else if(erLimit==1){AdminGUI admin=new AdminGUI(LoginGUI.this.log);Select sel=new Select();sel.setAdminList();for(int i=0;i<sel.getAdminAllId().size();i++){if(sel.getAdminAllId().get(i).toString().equals(erNam e)&&sel.getAdminAllPassword().get(i).equals(erPasswor d)){log.setVisible(false);admin.adminGo();}else if(i==sel.getAdminAllId().size()-1){JOptionPane.showMessageDialog(LoginGUI.this.log,"用户名密码错误");}}}}});jB2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){System.exit(0);}});log.setSize(240,260);log.setLocationRelativeTo(null);log.setResizable(false);log.addWindowListener(new WindowAdapter(){@Overridepublic void windowClosing(WindowEvent e){System.exit(0);}});log.setVisible(true);}}3.AdminGUI.java/*管理员登陆图形界面*/package ms;import java.awt.BorderLayout;import java.awt.GridLayout;import java.awt.TextArea;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;public class AdminGUI{JDialog log=null;//管理员登陆主窗口JPanel jp1=null;//用于存放管理员登陆标签和jp5JPanel jp2=null;//用于存放查询修改增加删除按钮JPanel jp3=null;//用于存放信息块和jp5JPanel jp4=null;//用于存放修改插入删除按钮JPanel jp5=null;//用于存放请输入学号文本框JLabel jadminLog=null; //管理员登陆标签JLabel jLabel=null; //请输入学号标签TextField tf=null; //请输入学号文本框JButton jb1=null;//查询按钮JButton jb2=null;//修改按钮JButton jb3=null;//增加按钮JButton jb4=null;//删除按钮JButton jb5=null; //列出全部学生信息TextArea ta=null;//信息文本框JLabel jl=null; //用于站位String id=null; //用于保存用户输入查询学号TextField[] jtf = new T extField[9] ;JDialog jdialog=null;public AdminGUI(JFrame log){super();this.log = new JDialog(log,"管理员登陆",true);jp1=new JPanel();jp2=new JPanel();jp3=new JPanel();jp4=new JPanel();jp5=new JPanel();jadminLog=new JLabel(new ImageIcon("image/admin.jpg"));jLabel=new JLabel("请输入学号");tf=new TextField();jb1=new JButton("查询");jb2=new JButton("修改");jb3=new JButton("增加");jb4=new JButton("删除");jb5=new JButton("列出全部学生信息");ta=new TextArea("点击查询按钮将在此显示查询信息");jl=new JLabel();}public void adminGo(){BorderLayout bl=new BorderLayout();bl.setVgap(30);bl.setHgap(30);log.setLayout(bl);log.add(jp1,BorderLayout.NORTH);BorderLayout bl1=new BorderLayout();bl1.setVgap(20);jp1.setLayout(bl1);jp1.add(jadminLog,BorderLayout.CENTER);jp5.setLayout(new GridLayout(1,2,200,200));jp5.add(jLabel);jp5.add(tf);log.add(jp2,BorderLayout.WEST);jp2.setLayout(new GridLayout(2,1,200,300));jp2.add(jb1);jp2.add(jb5);log.add(jp3,BorderLayout.CENTER);jp3.setLayout(new BorderLayout(10, 10));jp3.add(jp5,BorderLayout.NORTH);jp3.add(ta);jp5.setLayout(new GridLayout(1,5,10,10));jp5.add(jLabel);jp5.add(tf);log.add(jp4,BorderLayout.SOUTH);jp4.setLayout(new GridLayout(1,3,200,30));jp4.add(jb2);jp4.add(jb3);jp4.add(jb4);log.addWindowListener(new WindowAdapter(){@Overridepublic void windowClosing(WindowEvent e){System.exit(0);}});jb1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){AdminGUI.this.id=AdminGUI.this.tf.getText();Select sel=new Select();sel.selectStudent(AdminGUI.this.id);if(sel.getStudent()!=null){Student student=sel.getStudent();AdminGUI.this.ta.setText("学号\t\t"+"姓名\t\t"+"性别\t\t"+"出生日期\t\t"+"民族\t\t"+"籍贯\t\t"+"专业\t\t"+"班级\t\t"+"联系电话\t\t"+"密码\t\t");AdminGUI.this.ta.append("\n"+student.getId()+"\t\t"+student.getNa me()+"\t\t"+student.getSex()+"\t\t"+student.getBornDate()+"\t\t"+student.getNationality()+"\t\t"+student.getNationality()+"\t\t"+stu dent.getMaj()+"\t"+student.getCla()+"\t\t"+student.getTelNum()+"\t\t"+student.getPassword()+"\n");}else{AdminGUI.this.ta.setText("查无此人");}}});jb5.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){Select sel=new Select();sel.selectAllStudent();AdminGUI.this.ta.setText("学号\t\t"+"姓名\t\t"+"性别\t\t"+"出生日期\t\t"+"民族\t\t"+"籍贯\t\t"+"专业\t\t"+"班级\t\t"+"联系电话\t\t"+"密码\t\t\n");for(int i=0;i<sel.getAllStudent().size();i++){Student student=sel.getAllStudent().get(i);AdminGUI.this.ta.append(student.getId()+"\t\t"+student.getName() +"\t\t"+student.getSex()+"\t\t"+student.getBornDate()+"\t\t"+student.getNationality()+"\t\t"+student.getHometown()+"\t\t"+st udent.getMaj()+"\t"+student.getCla()+"\t\t"+student.getTelNum()+"\t\t"+student.getPa ssword()+"\n");}}});log.setSize(850,580);log.setLocationRelativeTo(null);log.setResizable(false);jb3.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){jdialog=new JDialog(AdminGUI.this.log);String[] str=new String[]{"姓名","性别","出生日期","民族","籍贯","专业","班级","联系电话","密码"};JLabel[] jlabel=new JLabel[9];for(int i=0;i<9;i++){jlabel[i]=new JLabel(str[i]);jtf[i]=new TextField();}JPanel jpanel1=new JPanel();JPanel jpanel2=new JPanel();JButton jbutton1=new JButton("确定");JButton jbutton2=new JButton("取消");jdialog.setLayout(new BorderLayout());jdialog.add(jpanel1,BorderLayout.CENTER);jdialog.add(jpanel2,BorderLayout.SOUTH);jpanel1.setLayout(new GridLayout(9,2,10,10));for(int i=0;i<9;i++){jpanel1.add(jlabel[i]);jpanel1.add(jtf[i]);}jpanel2.add(jbutton1);jpanel2.add(jbutton2);jbutton1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){Student student=new Student();student.setName(AdminGUI.this.jtf[0].getText());student.setSex(AdminGUI.this.jtf[1].getText()); student.setBornDate(AdminGUI.this.jtf[2].getText());student.setNationality(AdminGUI.this.jtf[3].getText());student.setHometown(AdminGUI.this.jtf[4].getText());student.setMaj(AdminGUI.this.jtf[5].getText());student.setCla(AdminGUI.this.jtf[6].getText());student.setTelNum(AdminGUI.this.jtf[7].getText()); student.setPassword(AdminGUI.this.jtf[8].getText());UpdateAndInsert up=new UpdateAndInsert();if(up.insertStudent(student)==true){JOptionPane.showMessageDialog(AdminGUI.this.log,"添加成功");}jdialog.dispose();}});jbutton2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){jdialog.dispose();}});jdialog.setSize(500,400);jdialog.setLocationRelativeTo(null);jdialog.setResizable(false);jdialog.setVisible(true);}});jb4.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){if(new Delete().delete(AdminGUI.this.tf.getText())==true){JOptionPane.showMessageDialog(AdminGUI.this.log,"刪除成功");}elseJOptionPane.showMessageDialog(AdminGUI.this.log,"刪除失敗");}});jb2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){Select sel=new Select();AdminGUI.this.id=AdminGUI.this.tf.getText();sel.selectStudent(AdminGUI.this.tf.getText());Student student=sel.getStudent();if(student==null){JOptionPane.showMessageDialog(AdminGUI.this.log,"请检查输入的学号");}else{jdialog=new JDialog(AdminGUI.this.log);String[] str=new String[]{"姓名","性别","出生日期","民族","籍贯","专业","班级","联系电话","密码"};JLabel[] jlabel=new JLabel[9];for(int i=0;i<9;i++){jlabel[i]=new JLabel(str[i]);}jtf[0]=new TextField(student.getName());jtf[1]=new TextField(student.getSex());jtf[2]=new TextField(student.getBornDate());jtf[3]=new TextField(student.getNationality());jtf[4]=new TextField(student.getHometown());jtf[5]=new TextField(student.getMaj());jtf[6]=new TextField(student.getCla());jtf[7]=new TextField(student.getTelNum());jtf[8]=new TextField(student.getPassword());JPanel jpanel1=new JPanel();JPanel jpanel2=new JPanel();JButton jbutton1=new JButton("确定");JButton jbutton2=new JButton("取消");jdialog.setLayout(new BorderLayout());jdialog.add(jpanel1,BorderLayout.CENTER);jdialog.add(jpanel2,BorderLayout.SOUTH);jpanel1.setLayout(new GridLayout(9,2,10,10));for(int i=0;i<9;i++){jpanel1.add(jlabel[i]);jpanel1.add(jtf[i]);}jpanel2.add(jbutton1);jpanel2.add(jbutton2);jbutton1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){Student student=new Student(Integer.parseInt(AdminGUI.this.id), jtf[0].getText(), jtf[1].getText(), jtf[2].getText(), jtf[3].getText(), jtf[4].getText(), jtf[5].getText(), jtf[6].getText(), jtf[7].getText(), jtf[8].getText());UpdateAndInsert up=new UpdateAndInsert();if(up.updateStudent(student)==true){JOptionPane.showMessageDialog(AdminGUI.this.log,"更改成功");;}jdialog.dispose();}});jbutton2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){jdialog.dispose();}});jdialog.setSize(500,400);jdialog.setLocationRelativeTo(null);jdialog.setResizable(false);jdialog.setVisible(true);}}});log.setVisible(true);}}4.StudentGUI.java/*学生操作图形界面*/package ms;import java.awt.BorderLayout;import java.awt.GridLayout;import java.awt.TextField;import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JDialog;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;public class StudentGUI{JDialog log=null;//学生登入类主窗口JPanel jp1=null;//用于存放登入块JPanel jp2=null;//用于存放信息块JPanel jp3=null;//用于密码存放修改块JPanel jp4=null;//用于存放我的信息按钮JLabel jl1=null;//学生登入标签JLabel jl2=null;//学号标签JLabel jl3=null;//学生姓名标签JLabel jl4=null;//性别标签JLabel jl5=null;//出生日期标签JLabel jl6=null;//民族标签JLabel jl7=null;//籍贯标签JLabel jl8=null;//专业标签JLabel jl9=null;//班级标签JLabel jl10=null;//联系电话标签JLabel jl11=null;//请输入密码标签JButton jb1=null;//我的信息按钮JButton jb2=null;//密码修改按钮TextField t1=null;//学号文本框TextField t2=null;//学生姓名文本框TextField t3=null;//性别文本框TextField t4=null;//出生日期文本框TextField t5=null;//民族文本框TextField t6=null;//籍贯文本框TextField t7=null;//专业文本框TextField t8=null;//班级文本框TextField t9=null;//联系电话文本框TextField t10=null;//密码文本框JPanel jp5=new JPanel();//存放密码输入框String id=null;public StudentGUI(JFrame log,String str){super();this.log = new JDialog(log,"学生登入",true);jp1=new JPanel();jp2=new JPanel();jp3=new JPanel();jp4=new JPanel();jl1=new JLabel(new ImageIcon("image/student.jpg"));jl2=new JLabel("学号:");jl3=new JLabel("学生姓名:");jl4=new JLabel("性别:");jl5=new JLabel("出生日期:");jl6=new JLabel("民族:");jl7=new JLabel("籍贯:");jl8=new JLabel("专业:");jl9=new JLabel("班级:");jl10=new JLabel("联系电话:");jl11=new JLabel("请输入新密码:");jb1=new JButton("我的信息");jb2=new JButton("密码修改");t1=new TextField();t2=new TextField();t3=new TextField();t4=new TextField();t5=new TextField();t6=new TextField();t7=new TextField();t8=new TextField();t9=new TextField();t10=new TextField();this.id=str;}public void studentGo(){BorderLayout bl=new BorderLayout();bl.setHgap(30);bl.setVgap(30);log.setLayout(bl);log.add(jp1,BorderLayout.NORTH);//将登入块信息块密码修改块放入主窗口log.add(jp2,BorderLayout.CENTER);log.add(jp3,BorderLayout.SOUTH);log.add(jp4,BorderLayout.WEST);jp1.add(jl1,BorderLayout.CENTER);jp2.setLayout(new GridLayout(5,2,20,10));jp2.add(jl2);jp2.add(t1);jp2.add(jl3);jp2.add(t2);jp2.add(jl4);jp2.add(t3);jp2.add(jl5);jp2.add(t4);jp2.add(jl6);jp2.add(t5);jp2.add(jl7);jp2.add(t6);jp2.add(jl8);jp2.add(t7);jp2.add(jl9);jp2.add(t8);jp2.add(jl10);jp2.add(t9);jp4.add(jb1);BorderLayout bl1=new BorderLayout();bl1.setHgap(38);jp3.setLayout(bl1);jp3.add(jb2,BorderLayout.WEST);jp3.add(jp5,BorderLayout.CENTER);jp5.setLayout(new GridLayout());jp5.add(jl11);jp5.add(t10);jb1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){Select sel=new Select();sel.selectStudent(id);Student student=sel.getStudent();t1.setText(new Integer(student.getId()).toString());t2.setText(student.getName());t3.setText(student.getSex());t4.setText(student.getBornDate());t5.setText(student.getNationality());t6.setText(student.getHometown());t7.setText(student.getMaj());t8.setText(student.getCla());t9.setText(student.getTelNum());}});jb2.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e){String password=StudentGUI.this.t10.getText();UpdateAndInsert up=new UpdateAndInsert();if(up.updatePassword(id, password)==true){JOptionPane.showMessageDialog(StudentGUI.this.log,"修改成功");}}});log.addWindowListener(new WindowAdapter(){@Overridepublic void windowClosing(WindowEvent e){System.exit(0);}});log.setSize(550,420);log.setLocationRelativeTo(null);log.setResizable(false);log.setVisible(true);}}5.Select.java/* 查询类包括查询的各种方法*/package ms;import java.sql.*;import java.util.LinkedList;public class Select{private LinkedList<Integer> studentAllId=null;private LinkedList<String> studentAllPassword=null;private LinkedList<Integer> adminAllId=null;private LinkedList<String> adminAllPassword=null;private Student student=null;private LinkedList<Student> allStudent=null;// 定义MySQL的数据库驱动程序public static final String DBDRIVER = "org.gjt.mm.mysql.Driver" ;// 定义MySQL数据库的连接地址public static final String DBURL = "jdbc:mysql://localhost:3306/studentMS" ;// MySQL数据库的连接用户名public static final String DBUSER = "root" ;// MySQL数据库的连接密码public static final String DBPASS = "systemout" ;public Select(){super();this.studentAllId = new LinkedList<Integer>();this.studentAllPassword = new LinkedList<String>();this.adminAllId = new LinkedList<Integer>();this.adminAllPassword = new LinkedList<String>();this.allStudent = new LinkedList<Student>();}public LinkedList<Integer> getStudentAllId(){return studentAllId;}public LinkedList<String> getStudentAllPassword(){return studentAllPassword;}public LinkedList<Integer> getAdminAllId(){return adminAllId;}public LinkedList<String> getAdminAllPassword(){return adminAllPassword;}public Student getStudent(){return student;}public LinkedList<Student> getAllStudent(){return allStudent;}public void setStudentList() //设置studentAllId 和studentAllPassword{Connection conn = null ; // 数据库连接Statement stmt = null ; // 数据库的操作对象ResultSet rs = null ; // 保存查询结果String sql = "select id,password from student";try{Class.forName(DBDRIVER) ; // 加载驱动程序}catch(ClassNotFoundException e){e.printStackTrace() ;}try{conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS) ;}catch(SQLException e){e.printStackTrace() ;}try{stmt = conn.createStatement() ; //得到stmt对象用于执行sql语句} catch (SQLException e1){e1.printStackTrace();}try{rs = stmt.executeQuery(sql) ;//保存sql查询结果} catch (SQLException e1){e1.printStackTrace();}try{while(rs.next()){studentAllId.add(rs.getInt(1));studentAllPassword.add(rs.getString(2));}} catch (SQLException e1){e1.printStackTrace();}try{rs.close() ;stmt.close() ;conn.close() ; // 数据库关闭}catch(SQLException e){e.printStackTrace() ;}}public void setAdminList(){Connection conn = null ; // 数据库连接Statement stmt = null ; // 数据库的操作对象ResultSet rs = null ; // 保存查询结果String sql = "select id,password from admin";try{Class.forName(DBDRIVER) ; // 加载驱动程序}catch(ClassNotFoundException e){e.printStackTrace() ;}try{conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS) ;}catch(SQLException e){e.printStackTrace() ;}try{stmt = conn.createStatement() ; //得到stmt对象用于执行sql语句} catch (SQLException e1){e1.printStackTrace();}try{rs = stmt.executeQuery(sql) ;//保存sql查询结果} catch (SQLException e1){e1.printStackTrace();}try{while(rs.next()){adminAllId.add(rs.getInt(1));adminAllPassword.add(rs.getString(2));}} catch (SQLException e1){e1.printStackTrace();}try{rs.close() ;stmt.close() ;conn.close() ; // 数据库关闭}catch(SQLException e){e.printStackTrace() ;}}public boolean selectStudent(String str){Connection conn = null ; // 数据库连接PreparedStatement pstmt = null ; // 数据库的操作对象ResultSet rs = null ; // 保存查询结果String sql = "select name,sex,bornDate,nationality,hometown,maj,cla,telNum,password "+ "from student where id=?";try{Class.forName(DBDRIVER) ; // 加载驱动程序}catch(ClassNotFoundException e){e.printStackTrace() ;}try{conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS) ;}catch(SQLException e){e.printStackTrace() ;}try{pstmt = conn.prepareStatement(sql) ; //得到stmt对象用于执行sql语句} catch (SQLException e1){e1.printStackTrace();}try{pstmt.setString(1, str);} catch (SQLException e2){e2.printStackTrace();}try{rs = pstmt.executeQuery() ;//保存sql查询结果} catch (SQLException e1){e1.printStackTrace();}try{while(rs.next()){student=new Student(Integer.parseInt(str),rs.getString(1),rs.getString(2),rs.getString(3),rs.getString(4),rs.getString(5),rs.getString(6),rs.getString(7),rs.getString(8),rs.getString(9));}} catch (SQLException e1){e1.printStackTrace();}try{rs.close() ;pstmt.close() ;conn.close() ; // 数据库关闭}catch(SQLException e){e.printStackTrace() ;}if(student !=null){return true;}else{return false;}}public void selectAllStudent(){Connection conn = null ; // 数据库连接PreparedStatement pstmt = null ; // 数据库的操作对象ResultSet rs = null ; // 保存查询结果String sql = "select * "+"from student";try{Class.forName(DBDRIVER) ; // 加载驱动程序}catch(ClassNotFoundException e){e.printStackTrace() ;}try{conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS) ;}catch(SQLException e){e.printStackTrace() ;}try{pstmt = conn.prepareStatement(sql) ; //得到stmt对象用于执行sql语句} catch (SQLException e1){e1.printStackTrace();}try{rs = pstmt.executeQuery() ;//保存sql查询结果} catch (SQLException e1){e1.printStackTrace();}try{while(rs.next()){student=new Student(rs.getInt(1),rs.getString(2),rs.getString(3),rs.getString(4),rs.getString(5),rs.getString(6),rs.getString(7),rs.getString(8),rs.getString(9),rs.getString(10));allStudent.add(student);}} catch (SQLException e1){e1.printStackTrace();}try{rs.close() ;pstmt.close() ;conn.close() ; // 数据库关闭}catch(SQLException e){e.printStackTrace() ;}}}6.UpdateAndInsert.java/*修改&&插入类定义了修改和插入的所有方法*/package ms;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import java.sql.Statement;public class UpdateAndInsert{// 定义MySQL的数据库驱动程序public static final String DBDRIVER = "org.gjt.mm.mysql.Driver" ;// 定义MySQL数据库的连接地址public static final String DBURL = "jdbc:mysql://localhost:3306/studentMS" ;// MySQL数据库的连接用户名public static final String DBUSER = "root" ;// MySQL数据库的连接密码public static final String DBPASS = "systemout" ;public boolean insertStudent (Student student){String name=student.getName();String sex=student.getSex();String bornDate=student.getBornDate();String nationality=student.getNationality();String hometown=student.getHometown();String maj=student.getMaj();String cla=student.getCla();String telNum=student.getTelNum();String password=student.getPassword();Connection conn = null ; // 数据库连接Statement stmt = null ; // 数据库操作try{Class.forName(DBDRIVER) ;} catch (ClassNotFoundException e){// TODO Auto-generated catch blocke.printStackTrace();} // 加载驱动程序String sql = "INSERT INTO student(name,sex,bornDate,nationality,hometown,maj,cla,telNum,passw ord) "+" VALUES('"+name+"','"+sex+"','"+bornDate+"','"+nationality+"','"+hometown+"' ,'"+maj+"','"+cla+"','"+telNum+"','"+password+"')";try{conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS) ;} catch (SQLException e){// TODO Auto-generated catch blocke.printStackTrace();}try{stmt = conn.createStatement() ;} catch (SQLException e){// TODO Auto-generated catch blocke.printStackTrace();} // 实例化Statement对象try{stmt.executeUpdate(sql) ;} catch (SQLException e){// TODO Auto-generated catch blocke.printStackTrace();} // 执行数据库更新操作try{stmt.close() ; // 关闭操作conn.close() ;} catch (SQLException e){// TODO Auto-generated catch blocke.printStackTrace();} // 数据库关闭return true;}public boolean updateStudent(Student student){Select sel=new Select();if(sel.selectStudent(newInteger(student.getId()).toString())==false){return false;}Connection conn = null ; // 数据库连接Statement stmt = null ; // 数据库操作String name=student.getName();String sex=student.getSex();String bornDate=student.getBornDate();String nationality=student.getNationality();String hometown =student.getHometown();String maj=student.getMaj();String cla=student.getCla();String telNum=student.getTelNum();String password=student.getPassword();String sql="UPDATE student SET name='"+name+"',sex='"+sex+"',bornDate='"+bornDate+"',nationality ='"+nationality+"',hometown='"+hometown+"',maj='"+maj+"',cla='"+c la+"',telNum='"+telNum+"',password='"+password+"' WHERE id="+student.getId() ;try{conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS) ;} catch (SQLException e1){// TODO Auto-generated catch blocke1.printStackTrace();}try{stmt = conn.createStatement() ;} catch (SQLException e){// TODO Auto-generated catch blocke.printStackTrace();} // 实例化Statement对象try{stmt.executeUpdate(sql) ;} catch (SQLException e){// TODO Auto-generated catch blocke.printStackTrace();} // 执行数据库更新操作try{stmt.close() ; // 关闭操作conn.close() ; // 数据库关闭} catch (SQLException e){// TODO Auto-generated catch blocke.printStackTrace();}return true;}。

java从键盘输⼊学⽣成绩，找出最⾼分，并输出学⽣成绩等级。

/*从键盘输⼊学⽣成绩，找出最⾼分，并输出学⽣成绩等级；成绩 >=最⾼分-10 等级为A成绩 >=最⾼分-20 等级为B成绩 >=最⾼分-30 等级为C其余为等级为D提⽰：先输⼊学⽣⼈数，根据⼈数创建int数组，存放学⽣成绩；*/package study01;import java.util.Scanner;public class Score {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.print("请输⼊学⽣⼈数:");int length = sc.nextInt();int[] scores = new int[length];int maxScore = 0;for (int i = 0; i < scores.length; i++) {scores[i] = sc.nextInt();if (scores[i] > maxScore) {maxScore = scores[i];}}System.out.println("最⾼分" + maxScore);System.out.println("输⼊的成绩为:");for (int i = 0; i < scores.length; i++) {char level;if (scores[i] > maxScore - 10) {level = 'A';} else if (scores[i] > maxScore - 20) {level = 'B';} else if (scores[i] > maxScore - 30) {level = 'C';} else {level = 'D';}System.out.println("student["+i+"] score is "+scores[i]+" grade is "+level);}}}输出结果如下：请输⼊学⽣⼈数:6907080506040最⾼分90输⼊的成绩为:student[0] score is 90 grade is Astudent[1] score is 70 grade is Cstudent[2] score is 80 grade is Bstudent[3] score is 50 grade is Dstudent[4] score is 60 grade is Dstudent[5] score is 40 grade is D。

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <dos.h>#include<ctype.h>#include<conio.h>#include<stddef.h>#include<time.h>#define PRINT1 textcolor(12); cprintf("\r 请按任意键返回主菜单\n\r");textcolor(10); getch();clrscr(); break;int shoudsave=0;struct student /* 学生信息结构体定义*/{char num[10],name[20],cla[4];int score1,score2,score3,total,ave;};typedef struct node{struct student data;struct node *next;}Node,*L;void print1(){cprintf("\r======================================================================= =========");}void print2(){cprintf("\n\r 1.输入学生成绩信息在这里你可以按照提示输入学生的班级，学号,姓名及各科成绩.\n");cprintf("\n\r 2.注销学生成绩信息在这里你可以按照学号或姓名将某名学生的信息从本系统中删除.\n");cprintf("\n\r 3.查询学生成绩信息在这里你可以按照学号或姓名查询某一名学生的信息.\n");cprintf("\n\r 4.修改学生成绩信息在这里你可以按照提示修改某一名学生的学号,姓名及各科成绩.");cprintf("\n\r 5.学生成绩信息排序在这里你可以看到所有学生的各科成绩.\n"); cprintf("\n\r 6.学生成绩信息统计在这里本系统将为你显示所有科目的最高分及最低分所得学生.\n");cprintf("\n\r 7.显示学生成绩信息在这里你可以看到系统中所有学生的信息.\n"); cprintf("\n\r 8.保存学生成绩信息在这里你可以将学生你信息保存到内存中.\n"); cprintf("\n\r 9.帮助学生成绩信息在这里你可以获得帮助信息.\n");cprintf("\n\r 0.退出系统在这里选择是否保存后,你可以安全的退出本系统.\n\n\r ");}void menu(){cprintf("\n\r\xc9\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xc d\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcb\xcd\xcd\xcd\xcd\ xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xc d\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xbb");cprintf("\r\xba 学生信息导入\xba 学生信息处理\xba");cprintf("\r\xba____________________________________\xba___________________________ _______________\xba");cprintf("\r\xba 1-->输入学生成绩信息\xba 6-->学生成绩信息统计\xba");cprintf("\r\xba 2-->注销学生成绩信息\xba 7-->显示学生成绩信息\xba");cprintf("\r\xba 3-->查询学生成绩信息\xba 8-->保存学生成绩信息\xba");cprintf("\r\xba 4-->修改学生成绩信息\xba 9-->帮助学生成绩信息\xba");cprintf("\r\xba 5-->学生成绩信息排序\xba 0-->退出系统\xba");cprintf("\r\xc8\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\ xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xca\xcd\xcd\xcd\xcd\xc d\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\ xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xbc");}void wrong(){cprintf("\n\r输入错误!请验证后重新输入.\n");}void notfind(){cprintf("\n\r该学生信息不存在!请验证后重新输入.\n");}void printc() /* 此函数用于输出中文格式*/{cprintf("\r学号姓名班级英语数学C语言总分平均分\n ");}void printe(Node *p) /* 此函数用于输出英文格式*/{cprintf("\r%-4s%-4s%4s%5d%5d%8d%5d%7d\n\r",p->data.num,p->,p->data.cla,p->dat a.score3,p->data.score2,p->data.score1,p->data.total,p->data.ave);}Node* Locate(L l,char findinfo[],char nameornum[]) /* 该函数用于定位连表中符合要求的接点，并返回该指针*/{Node *r;if(strcmp(nameornum,"num")==0)/* 按学号查询*/{r=l->next;while(r!=NULL){if(strcmp(r->data.num,findinfo)==0)return r;r=r->next;}}else if(strcmp(nameornum,"name")==0) /* 按姓名查询*/{r=l->next;while(r!=NULL){if(strcmp(r->,findinfo)==0)return r;r=r->next;}}return 0;}void input(L l) /* 增加学生*/{Node *p,*r,*s;char num[10];r=l;s=l->next;while(r->next!=NULL)r=r->next;/* 将指针置于最末尾*/while(1){ cprintf("\r如果输入完毕，请按任意键返回主菜单\n");cprintf("\r如果你还想输入，请按y(yes)继续\n\r");scanf("%s",num);if(strcmp(num,"y")==0){ cprintf("请你输入学号:");scanf("%s",num); } else break;while(s){if(strcmp(s->data.num,num)==0){printf("\t学号为'%s'的学生已经存在,若要修改请你选择'4 修改'!\n",num);print1();printc();printe(s);print1();printf("\n");getch();return;}s=s->next;}p=(Node *)malloc(sizeof(Node));strcpy(p->data.num,num);cprintf("\r请你输入姓名:");scanf("%s",p->);getchar();cprintf("\r请你输入班级:");scanf("%s",p->data.cla);getchar();cprintf("\r请你输入c语言成绩(0-100):");scanf("%d",&p->data.score1);getchar();cprintf("\r请你输入数学成绩(0-100):");scanf("%d",&p->data.score2);getchar();cprintf("\r请你输入英语成绩(0-100):");scanf("%d",&p->data.score3);getchar();p->data.total=p->data.score3+p->data.score1+p->data.score2;p->data.ave=p->data.total / 3; /* 信息输入已经完成*/p->next=NULL;r=p;shoudsave=1;}}void query(L l) /* 查询学生信息*/{int select;char findinfo[20];Node *p;if(!l->next){cprintf("\n 没有信息可以查询!\n");return;}cprintf("\n1==>按学号查找\n\r2==>按姓名查找\n\r");scanf("%d",&select);if(select==1) /* 学号*/{cprintf("\r请你输入要查找的学号:");scanf("%s",findinfo);p=Locate(l,findinfo,"num");if(p){cprintf(" 查找结果\n\r");print1();printc();printe(p);print1();}elsenotfind();}else if(select==2) /* 姓名*/{cprintf("\r请你输入要查找的姓名:");scanf("%s",findinfo);p=Locate(l,findinfo,"name");if(p){cprintf(" 查找结果\n\r");print1();printc();print1();}elsenotfind();}elsewrong();}void Delete(L l) /* 删除学生信息*/{int select;Node *p,*r;char findinfo[20];if(!l->next){cprintf("\n 没有信息可以删除!\n");return;}cprintf("\n1==>按学号删除\n\r2==>按姓名删除\n\r");scanf("%d",&select);if(select==1){cprintf("\r请你输入要删除的学号:");scanf("%s",findinfo);p=Locate(l,findinfo,"num");if(p){r=l;while(r->next!=p)r=r->next;r->next=p->next;free(p);cprintf("\n\r该学生已经成功删除!\n");shoudsave=1;}elsenotfind();}else if(select==2){cprintf("\r请你输入要删除的姓名:");scanf("%s",findinfo);p=Locate(l,findinfo,"name");if(p){r=l;while(r->next!=p)r=r->next;r->next=p->next;free(p);cprintf("\n\r该学生已经成功删除!\n");shoudsave=1;}elsenotfind();}else wrong();}void modify(L l) /*修改学生信息*/{Node *p;char findinfo[20];if(!l->next){cprintf("\n\r没有信息可以修改!\n");return;}cprintf("\r请你输入要修改的学生学号:");scanf("%s",findinfo);p=Locate(l,findinfo,"num");if(p){cprintf("\r请你输入新学号(原来是%s):",p->data.num);scanf("%s",p->data.num);cprintf("\r请你输入新姓名(原来是%s):",p->);scanf("%s",p->);getchar();cprintf("\r请你输入新班级(原来是%s):",p->data.cla);scanf("%s",p->data.cla);cprintf("\r请你输入新的c语言成绩(原来是%d分):",p->data.score1);scanf("%d",&p->data.score1);getchar();cprintf("\r请你输入新的数学成绩(原来是%d分):",p->data.score2);scanf("%d",&p->data.score2);getchar();cprintf("\r请你输入新的英语成绩(原来是%d分):",p->data.score3);scanf("%d",&p->data.score3);p->data.total=p->data.score3+p->data.score1+p->data.score2;p->data.ave=p->data.total/3;cprintf("\n\r信息修改成功!\n");shoudsave=1;}elsenotfind();}void display(L l){/*显示全部学生信息*/int count=0;Node *p;p=l->next;if(!p){cprintf("\n\r 没有信息可以显示!\n");return;}cprintf(" 显示结果");print1();printc();while(p){ if(count%5==0) getch();printe(p);p=p->next;count++;}print1();cprintf("\n");}void Statistic(L l) /*统计学生信息*/{Node *pm_max,*pe_max,*pc_max,*pt_max,*pa_max; /* 用于指向分数最高的接点*/ Node *pm_min,*pe_min,*pc_min,*pt_min,*pa_min;Node *r=l->next;if(!r){cprintf("\n\r 没有信息可以统计!\n");return ;}pm_max=pe_max=pc_max=pt_max=pa_max=pm_min=pe_min=pc_min=pt_min=pa_min=r; while(r!=NULL){if(r->data.score1>=pc_max->data.score1)pc_max=r;if(r->data.score1<=pc_min->data.score1)pc_min=r;if(r->data.score2>=pm_max->data.score2)pm_max=r;if(r->data.score2<=pm_min->data.score2)pm_min=r;if(r->data.score3>=pe_max->data.score3)pe_max=r;if(r->data.score3<=pe_min->data.score3)pe_min=r;if(r->data.total>=pt_max->data.total)pt_max=r;if(r->data.total<=pt_min->data.total)pt_min=r;if(r->data.ave>=pa_max->data.ave)pa_max=r;if(r->data.ave<=pa_min->data.ave)pa_min=r;r=r->next;}cprintf("====================================统计结果====================================\n");cprintf("\r总分最高者: %-16s %d分\n",pt_max->,pt_max->data.total); cprintf("\r平均分最高者: %-16s %d分\n",pa_max->,pa_max->data.ave); cprintf("\r英语最高者: %-16s %d分\n",pe_max->,pe_max->data.score3); cprintf("\r数学最高者: %-16s %d分\n",pm_max->,pm_max->data.score2); cprintf("\rc语言最高者: %-16s %d分\n\r",pc_max->,pc_max->data.score1); cprintf("\r总分最低者: %-16s %d分\n",pt_min->,pt_min->data.total); cprintf("\r平均分最低者: %-16s %d分\n",pa_min->,pa_min->data.ave); cprintf("\r英语最低者: %-16s %d分\n",pe_min->,pe_min->data.score3); cprintf("\r数学最低者: %-16s %d分\n",pm_min->,pm_min->data.score2); cprintf("\rc语言最低者: %-16s %d分\n\r",pc_min->,pc_min->data.score1); print1();}void Sort(L l){L ll;Node *p,*rr,*s;ll=(L)malloc(sizeof(Node)); /* 用于做新的连表*/ll->next=NULL;if(l->next==NULL){cprintf("\n\r 没有信息可以排序!\n");return ;}p=l->next;while(p){s=(Node*)malloc(sizeof(Node)); /* 新建接点用于保存信息*/s->data=p->data;s->next=NULL;rr=ll;while(rr->next!=NULL && rr->next->data.total>=p->data.total)rr=rr->next;if(rr->next==NULL)rr->next=s;else{s->next=rr->next;rr->next=s;}p=p->next;}free(l);l->next=ll->next;cprintf("\n\r 排序已经完成!\n");}void Save(L l) /* */{FILE* fp;Node *p;int flag=1,count=0;fp=fopen("c:\\student","wb");if(fp==NULL){cprintf("\n\r 重新打开文件时发生错误!\n");exit(1);}p=l->next;while(p){if(fwrite(p,sizeof(Node),1,fp)==1){p=p->next;count++;}else{flag=0;break;}}if(flag){cprintf("\n\r 文件保存成功.(有%d条信息已经保存.)\n\r",count);shoudsave=0;}fclose(fp);}void main() /* */{L l; /* 链表*/FILE *fp; /* 文件指针*/int count=0 ,i,menu_select; /*菜单选择*/char ch ,creat;Node *p,*r;time_t it;clrscr();textmode(C80);window(1,1,80,25);textbackground(1); clrscr();textcolor(10);printf("\r 学生成绩管理系统");printf("\r -------扬州大学信息工程学院软件0902班") ;printf("\r 设计人员:李天鹏");l=(Node*)malloc(sizeof(Node));l->next=NULL;r=l;fp=fopen("c:\\student","rb");if(fp==NULL){cprintf("\n\r 该文件还未存在，是否需要创建？(y/n，Y/N)\n\r");scanf("%c",&creat);if(creat=='y'||creat=='Y'){fp=fopen("c:\\student","wb");}elseexit(0);}gotoxy(9,11); textcolor(12);cprintf("\n\r 文件已经打开,系统正在导入信息");for(i=0;i<6;i++){ cprintf(".");sleep(1);}textcolor(10);gotoxy(9,11); cprintf("\n ");while(!feof(fp)){p=(Node*)malloc(sizeof(Node));if(fread(p,sizeof(Node),1,fp)) /* 将文件的内容放入接点中*/{p->next=NULL;r->next=p;r=p; /* 将该接点挂入连中*/count++;}}fclose(fp);/* 关闭文件*/gotoxy(1,3);cprintf("\n\r信息导入完毕,系统共导入%d条信息",count);sleep(1);while(1){ menu();textcolor(12);cprintf("\r现在时间: "); it=time(NULL);cprintf(ctime(&it));cprintf("\r左边数字对应功能选择,请按0--9选择操作:\n\r");textcolor(10) ;scanf("%d",&menu_select);if(menu_select==0){if(shoudsave==1){ getchar(); textcolor(128+12);cprintf("\n\r 信息已经改动,是否将改动保存到文件中(y/n Y/N)?\n\r"); scanf("%c",&ch);if(ch=='y'||ch=='Y')Save(l);}cprintf("\n\r 你已经成功退出学生成绩信息系统,欢迎下次继续使用!\n"); break;}switch(menu_select){case 1: clrscr(); input(l); clrscr(); break; /* 输入学生*/case 2: clrscr(); Delete(l); PRINT1 /* 删除学生*/case 3: clrscr(); query(l); PRINT1 /* 查询学生*/case 4: clrscr(); modify(l); PRINT1 /* 修改学生*/case 5: clrscr(); Sort(l); PRINT1case 6: clrscr(); Statistic(l); PRINT1case 7: clrscr(); display(l); PRINT1case 8: clrscr(); Save(l); PRINT1 /* 保存学生*/case 9: clrscr(); cprintf(" ==========帮助信息==========\n");print2(); PRINT1 ;default: wrong(); getchar(); break;}}}。

学生成绩在线管理系统数据库课程设计mysql+java以下是一个学生成绩在线管理系统的数据库设计示例，使用MySQL数据库和Java 编程语言：1. 学生表（students）-学生ID（student_id）：主键，自增-学生姓名（student_name）：varchar类型，最大长度为50-学生年龄（student_age）：整数类型-学生性别（student_gender）：varchar类型，最大长度为10-学生班级（student_class）：varchar类型，最大长度为502. 课程表（courses）-课程ID（course_id）：主键，自增-课程名称（course_name）：varchar类型，最大长度为503. 成绩表（scores）-成绩ID（score_id）：主键，自增-学生ID（student_id）：外键，关联到学生表的学生ID-课程ID（course_id）：外键，关联到课程表的课程ID-分数（score）：浮点数类型通过以上表的设计，你可以实现以下功能：-添加学生信息-添加课程信息-添加学生成绩-查询学生信息-查询课程信息-查询学生的成绩-更新学生信息-更新课程信息-更新学生成绩-删除学生信息-删除课程信息-删除学生成绩在Java中，你可以使用JDBC（Java Database Connectivity）来连接MySQL数据库并执行SQL语句来实现对数据库的操作。

你需要配置数据库连接信息，并编写相应的Java代码来执行查询和更新操作。

这只是一个简单的数据库设计示例，你可以根据你的具体需求进行调整和扩展。

java课程设计题目及代码题目：学生成绩管理系统设计一个学生成绩管理系统，能够实现以下功能：1. 添加学生信息：录入学生的姓名、学号、性别等基本信息。

2. 添加学生成绩：录入学生的各门成绩，包括语文、数学、英语等课程。

3. 查找学生成绩：根据学号或姓名查找学生的成绩信息。

4. 修改学生成绩：根据学号或姓名修改学生的成绩信息。

5. 删除学生成绩：根据学号或姓名删除学生的成绩信息。

6. 统计学生成绩：统计全班学生的各门课程的平均分、最高分和最低分。

代码实现如下：```javaimport java.util.ArrayList;import java.util.HashMap;import java.util.Map;import java.util.Scanner;class Student {private String name;private String studentId;private String gender;private Map<String, Integer> scores;public Student(String name, String studentId, String gender) { = name;this.studentId = studentId;this.gender = gender;this.scores = new HashMap<>();}public String getName() {return name;}public String getStudentId() {return studentId;}public String getGender() {return gender;}public Map<String, Integer> getScores() {return scores;}public void addScore(String subject, int score) {scores.put(subject, score);}public void updateScore(String subject, int score) { scores.put(subject, score);}public void removeScore(String subject) {scores.remove(subject);}}class GradeManagementSystem {private ArrayList<Student> students;public GradeManagementSystem() {students = new ArrayList<>();}public void addStudent(String name, String studentId, String gender) {students.add(new Student(name, studentId, gender));}public Student findStudentById(String studentId) {for (Student student : students) {if (student.getStudentId().equals(studentId)) {return student;}}return null;}public Student findStudentByName(String name) {for (Student student : students) {if (student.getName().equals(name)) {return student;}}return null;}public void addScore(String studentId, String subject, int score) {Student student = findStudentById(studentId);if (student != null) {student.addScore(subject, score);}}public void updateScore(String studentId, String subject, int score) {Student student = findStudentById(studentId);if (student != null) {student.updateScore(subject, score);}}public void removeScore(String studentId, String subject) {Student student = findStudentById(studentId);if (student != null) {student.removeScore(subject);}}public void printStudentInfo(Student student) {System.out.println("姓名：" + student.getName());System.out.println("学号：" + student.getStudentId());System.out.println("性别：" + student.getGender());System.out.println("成绩：");for (Map.Entry<String, Integer> entry :student.getScores().entrySet()) {System.out.println(entry.getKey() + "：" +entry.getValue());}}public void printClassStatistics() {int chineseTotal = 0;int mathTotal = 0;int englishTotal = 0;int chineseMax = 0;int mathMax = 0;int englishMax = 0;int chineseMin = Integer.MAX_VALUE;int mathMin = Integer.MAX_VALUE;int englishMin = Integer.MAX_VALUE;for (Student student : students) {Map<String, Integer> scores = student.getScores();if (scores.containsKey("语文")) {int chineseScore = scores.get("语文");chineseTotal += chineseScore;chineseMax = Math.max(chineseMax, chineseScore);chineseMin = Math.min(chineseMin, chineseScore); }if (scores.containsKey("数学")) {int mathScore = scores.get("数学");mathTotal += mathScore;mathMax = Math.max(mathMax, mathScore);mathMin = Math.min(mathMin, mathScore);}if (scores.containsKey("英语")) {int englishScore = scores.get("英语");englishTotal += englishScore;englishMax = Math.max(englishMax, englishScore); englishMin = Math.min(englishMin, englishScore); }}int studentCount = students.size();double chineseAverage = (double) chineseTotal / studentCount;double mathAverage = (double) mathTotal / studentCount; double englishAverage = (double) englishTotal / studentCount;System.out.println("语文最高分：" + chineseMax);System.out.println("数学最高分：" + mathMax);System.out.println("英语最高分：" + englishMax);System.out.println("语文最低分：" + chineseMin);System.out.println("数学最低分：" + mathMin);System.out.println("英语最低分：" + englishMin);System.out.println("语文平均分：" + chineseAverage); System.out.println("数学平均分：" + mathAverage); System.out.println("英语平均分：" + englishAverage); }}public class Main {public static void main(String[] args) {GradeManagementSystem system = new GradeManagementSystem();// 添加学生信息system.addStudent("张三", "001", "男");system.addStudent("李四", "002", "女");system.addStudent("王五", "003", "男");// 添加学生成绩system.addScore("001", "语文", 90);system.addScore("001", "数学", 85);system.addScore("001", "英语", 92);system.addScore("002", "语文", 80);system.addScore("002", "数学", 75);system.addScore("002", "英语", 88);system.addScore("003", "语文", 95);system.addScore("003", "数学", 90);system.addScore("003", "英语", 97);// 查找学生成绩Student student = system.findStudentById("001"); if (student != null) {system.printStudentInfo(student);}// 修改学生成绩system.updateScore("002", "数学", 78);student = system.findStudentById("002");if (student != null) {system.printStudentInfo(student);}// 删除学生成绩system.removeScore("003", "语文");student = system.findStudentById("003");if (student != null) {system.printStudentInfo(student);}// 统计学生成绩system.printClassStatistics();}}```这是一个简单的学生成绩管理系统，通过添加学生信息、添加学生成绩、查找学生成绩、修改学生成绩、删除学生成绩和统计学生成绩等功能，可以对学生的成绩进行管理和操作。

基于JAVA的学生成绩管理系统的设计与实现摘要：本文按照目前流行的B/S体系结构模式，结合现有的学生成绩管理系统的现状，采用SQL Server 2000数据库和JAVA技术，设计开发了学生成绩管理系统系统，本系统分为前台页面和后台管理两大部分，主要实现成绩查询、成绩删除、成绩添加、成绩修改四大主体功能。

在细节方面，着重考虑了用户添加成绩、成绩查询两方面的简易操作，力求为客户带来方便。

关键词：B/S模式；JA V A；SQL ServerAbstract：This according to the popular B / S architecture model, combined with the current status of student achievement management system using SQL Server 2000 database and JAVA technology, design and development of student achievement management system, the system is divided into front page and back office management two parts, the main accomplishment query results to delete, add scores, results modify the four main functions. In detail, the focus to consider the user to add results, performance query both easy to operate, and strive to bring convenience for customers.Key words：B/S mode；JA V A；SQL Server近年来，随着高校的扩招，运用常规的方法对学生成绩的管理变得越来越困难，因此学校迫切的需要一种高效的系统来帮助其管理学生的成绩。

学生成绩管理系统源代码#include<stdio.h>#include<stdlib.h>int main(){typedef struct LNode{char name[6];int no;int yw;int sx;int yy;struct LNode *next;}LinkList;struct NameNo{int no;int yw;int sx;int total;char name[6];}st[10];FILE *fp,*fp1;char ch,sname[6];int x,i,j;NameNo tmp;LinkList *p,*s;printf("\n");printf("-------------------------------");printf("学生成绩管理系统");printf("--------------------------------");printf("\n\n");printf("在您的C盘根目录下是否有cj1.txt和cj2.txt文件？如果有请输入，1");printf("否则输入0；如果没有，那么程序将终止！1 or 0？");scanf("%d",&i);if(i==0) return 0;printf("\n\n");printf("对cj1.txt和cj2.txt进行合成请按‘1’");scanf("%d",&i);if(i!=1) return 0;printf("正在把cj1.txt和cj2.txt中的数据进行合并\n");printf("......\n.....\n....\n...\n..\n.\n");if((fp=fopen("c:\\cj1.txt","rt"))==NULL){printf("无cj1.txt文本文件，程序结束。

学生成绩管理系统的设计与实现代码本系统有增加学生记录、修改学生记录、删除学生记录、按姓名查询学生记录、按C语言成绩对学生进行排序、退出系统6大功能。

能够对学生的姓名，学号，c语言成绩做相应的操作。

在检测到输入成绩大于55时，会自动加上5。

该管理系统设计功能模块图：下面是源代码：#include "stdio.h"#include "string.h"/*定义学生结构体*/struct Student{char ID[20]; //学号char Name[20]; //姓名float C_Mark; //C语言成绩};/*声明学生数组及学生数量*/struct Student students[1000];int num=0;/*通过学号返回数组下标*/int Student_SearchByIndex(char id[]) {int i;for (i=0;i<num;i++){if (strcmp(students[i].ID,id)==0) {return i;}}return -1;}/*通过姓名返回数组下标*/int Student_SearchByName(char name[]) {int i;for (i=0;i<num;i++){if (strcmp(students[i].Name,name)==0){return i;}}return -1;}/*显示单条学生记录*/void Student_DisplaySingle(int index){printf("%10s%10s%8s\n","学号","姓名","C语言成绩");printf("-------------------------------------------------------------\n");printf("%10s%10s%8.2f\n",students[index].ID,students[index] .Name,students[index].C_Mark);}/****1、增加学生记录*****/void Student_Insert(){while(1){printf("请输入学号:");scanf("%s",&students[num].ID);getchar();printf("请输入姓名:");scanf("%s",&students[num].Name);getchar();printf("请输入C语言成绩:");scanf("%f",&students[num].C_Mark);getchar();if (54<students[num].C_Mark && students[num].C_Mark< 60) //把55~59分之间的成绩都加上5分{students[num].C_Mark += 5;}num++;printf("是否继续?(Y/N)，继续请按任意键，否则输入N:");if (getchar()=='N'){break;}}}/******2、修改学生信息**********/void Student_Modify(){while(1){char id[20];int index;printf("请输入要修改的学生的学号:");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if (index==-1){printf("该学生不存在!\n");}else{printf("你要修改的学生信息为:\n");Student_DisplaySingle(index);printf("-- 请输入新值--\n");printf("请输入学号:");scanf("%s",&students[index].ID);getchar();printf("请输入姓名:");scanf("%s",&students[index].Name);getchar();printf("请输入C语言成绩:");scanf("%f",&students[index].C_Mark);getchar();}printf("是否继续?(Y/N)，继续请按任意键，否则输入N:");if (getchar()=='N'){break;}}}/****3、删除学生信息****/void Student_Delete(){int i;while(1){char id[20];int index;printf("请输入要删除的学生的学号:");scanf("%s",&id);getchar();index=Student_SearchByIndex(id);if (index==-1){printf("学生不存在!\n");}else{printf("你要删除的学生信息为:\n");Student_DisplaySingle(index);printf("是否真的要删除?(Y/N)");if (getchar()=='Y'){for (i=index;i<num-1;i++){students[i]=students[i+1];//把后边的对象都向前移动}num--;}getchar();printf("已删除\n");}printf("是否继续删除?(Y/N)，继续请按任意键，否则输入N:");if (getchar()=='N'){break;}}}/****4、按姓名查询******/void Student_Select(){while(1){char name[20];int index;printf("请输入要查询的学生的姓名:");scanf("%s",&name);getchar();index=Student_SearchByName(name);if (index==-1){printf("学生不存在!\n");}else{printf("你要查询的学生信息为:\n");Student_DisplaySingle(index);}printf("是否继续?(Y/N)，继续请按任意键，否则输入N:");if (getchar()=='N'){break;}}}/******5、按C语言成绩排序*******/void Student_SortByAverage(){int i,j;struct Student tmp;for (i=0;i<num;i++){for (j=1;j<num-i;j++){if (students[j-1].C_Mark<students[j].C_Mark){tmp=students[j-1];students[j-1]=students[j];students[j]=tmp;}}}}/*显示学生信息*/void Student_Display(){int i;printf("%10s%10s%8s\n","学号","姓名","成绩");printf("-------------------------------------------------------------\n");for (i=0;i<num;i++){printf("%10s%10s%8.2f\n",students[i].ID,students[i].Name ,students[i].C_Mark);}}/*将学生信息从文件（Database.txt）中读出*/void IO_ReadInfo(){FILE *fp;int i;if ((fp=fopen("Database.txt","rb"))==NULL){printf("不能打开文件!\n");return;}if (fread(&num,sizeof(int),1,fp)!=1){num=-1;}else{for(i=0;i<num;i++){fread(&students[i],sizeof(struct Student),1,fp);}}fclose(fp);}/*将学生信息写入文件（Database.txt）*/void IO_WriteInfo(){FILE *fp;int i;if ((fp=fopen("Database.txt","wb"))==NULL){printf("不能打开文件!\n");return;}if (fwrite(&num,sizeof(int),1,fp)!=1){printf("写入文件错误!\n");}for (i=0;i<num;i++){if (fwrite(&students[i],sizeof(struct Student),1,fp)!=1){printf("写入文件错误!\n");}}fclose(fp);}/***********主程序*********/void main(){int choice;IO_ReadInfo(); //读取文件while(1){/*主菜单*/printf("\n------ 学生成绩管理系统------\n");printf("1. 增加学生记录\n");printf("2. 修改学生记录\n");printf("3. 删除学生记录\n");printf("4. 按姓名查询学生记录\n");printf("5. 按C语言成绩排序\n");printf("6. 退出\n");printf("请选择(1-6):");scanf("%d",&choice);getchar();switch(choice){case 1:Student_Insert();break;case 2:Student_Modify();break;case 3:Student_Delete();break;case 4:Student_Select();break;case 5:Student_SortByAverage();Student_Display();break;case 6:exit(0);break;}IO_WriteInfo();}}1234567891011121415161718192021222324252627282930313233343637383940414243444546474849505152535455565859606162636465666768697071727374757677788081828384858687888990919293949596979899 100102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320322323324325326327328329330331332333334335336337338运行结果:测试第一个功能，输入四个学生的成绩：测试第二个功能，修改学生记录：测试第三个功能，删除学生记录：测试第四个功能，按姓名查询学生记录：测试第五个功能，显示所有学生的成绩，按照C语言成绩由高到底排序：我们可以看到，各项功能的实现，在第2个步骤中，将赵的成绩改为80，而第3个步骤删除了李的成绩。

Java课程设计课题：学生成绩管理系统一、问题及功能分析1、身份验证，和使用系统的权限设置、判定。

2、实现同学的学号、性别、成绩等信息的录入、编辑3、提供对学号或姓名,进行成绩或所有信息的查询.4、计算学生平均成绩，显示最高成绩学生信息5、能实现按成绩、学号、姓名排序列出学生信息.6、能统计学生成绩分数段的分布（60以下、60～70、70~80、80～90、90~100)情况，并输出。

7、用文件保存数据,以便反复使用.二、概要设计import java。

lang.*；import java.io。

*；class Mytest｛public static void main(String［］args）throws IOException｛{int select；select = 1；Student stu［］= new Student[10］；StudentMis mis=new StudentMis(）;Scanner sc = new Scanner(System.in）；System。

out.println（)；System.out。

println（”—---—-—-————————-——-——-——-—---—--———-——"）;System.out。

println(”* *");System。

out.println(”欢迎进入学生成绩管理系统"）;System。

out。

println（”＊＊”）;System。

out.println（”-————--——-—-—---——-——--———-—-—----——--—")；while(true)｛System。

out.println( )；System。

out.println(" 请选择您的操作：")；System.out.println（” 1.录入学生成绩信息;”);System.out.println(" 2.显示学生成绩信息；”)；System。