【GUI程序设计】学生信息管理系统

  第12个java作业,断断续续的用闲散时间写了十多天才算完成,一共大概1470行,记得上学期的C++课程设计也是写了1400多行,写着写着就发现上了瘾,不是为了应付作业而写,而是想探索自己未知的知识领域。

前身是:学生信息排序管理(JAVA文件操作)   用图形界面进行了重构

注意事项:

1.默认把学生信息放置于C盘根目录下,因为位置特殊请以管理员模式启动程序和eclipse(否则会导致保存失败)
2.共1473行代码
3.时间仓促,有部分bug以及影响体验的项目未修复(例如修改后请手动点击读取记录进行刷新)

运行截图:


源代码:(层次由低到高)

一、后台操作包(studentAndFileAction包)

1.Student类(表示学生的基本数据单元)

package studentAndFileAction;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Student{
  String stuNo,name;
  double grade;
  public Student() {
    stuNo=name="";
    grade=0.0;
  }
  public Student(String stuNo,String name,String grade) {
    this.stuNo=stuNo;
    this.name=name;
    this.grade=Double.valueOf(grade);
  }
  public Student(String stuNo,String name,double grade) {
    this.stuNo=stuNo;
    this.name=name;
    this.grade=grade;
  }
  public String stuInfo(){
    if(this.name.length()=="占位符".length())
      return String.format("%-12s %-30s %s",this.stuNo,this.name,Double.toString(this.grade));
    else return String.format("%-12s %-33s %s",this.stuNo,this.name,Double.toString(this.grade));
    }
}

2.StudentGroup类(表示学生集合的基本数据单元)

同时实现了增改查删的功能

package studentAndFileAction;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;


public class StudentGroup{
  public List<Student> dataBase =new ArrayList<Student>();
  public void add(Student stu) {
    try {
      dataBase.add(stu);
    } catch (NumberFormatException e) {
      System.out.println("学号格式错误,本记录作废");
    }
  }
  public String modify(String no,String name,String grade) {
    for(int i=0;i<dataBase.size();i++)
      if(dataBase.get(i).stuNo.equals(no)) {
        dataBase.get(i).name=name;
        dataBase.get(i).grade=Double.valueOf(grade);
        return "修改成功\r\n新记录是:\r\n"+dataBase.get(i).stuInfo(); 
      }
    return "找不到";
  }
  
  //查询------------------------------------------------
  public String lookup(String no,String name) {//精准查询
    int index_ans[]=new int [dataBase.size()];
    int index_num=0;
    for(int i=0;i<dataBase.size();i++)
      if(dataBase.get(i).stuNo.equals(no)&&dataBase.get(i).name.equals(name))
        index_ans[index_num++]=i;
    if(index_num==0) return "找不到";
    else {
      String re="";
      for(int i=0;i<index_num;i++)
        re+=(dataBase.get(index_ans[i]).stuInfo()+"\r\n");
      return re;
    }
  }
  public String lookup(String infomation,int num) {//模糊查询  num=1学号查询 2:名字查询 3:成绩查询
    int index_ans[]=new int [dataBase.size()];
    int index_num=0;
    if(num==1) {//学号查询
      for(int i=0;i<dataBase.size();i++)
        if(dataBase.get(i).stuNo.equals(infomation))
          index_ans[index_num++]=i;
      }else if(num==2) {
        for(int i=0;i<dataBase.size();i++)
          if(dataBase.get(i).name.equals(infomation))
            index_ans[index_num++]=i;
      }else if(num==3) {
        for(int i=0;i<dataBase.size();i++)
          if(dataBase.get(i).grade==Double.valueOf(infomation))
            index_ans[index_num++]=i;
      }
    if(index_num==0) return "找不到";
    else {
      String re="";
      for(int i=0;i<index_num;i++)
        re+=(dataBase.get(index_ans[i]).stuInfo()+"\r\n");
      return re;
    }
  }
  //删除-------------------------------------------------------
  public String delete(String no,String name) {//精准删除
    int index_ans[]=new int [dataBase.size()];
    int index_num=0;
    for(int i=0;i<dataBase.size();i++)
      if(dataBase.get(i).stuNo.equals(no)&&dataBase.get(i).name.equals(name))
        index_ans[index_num++]=i;
    if(index_num==0) return "找不到";
    else {
      String re="";
      for(int i=0;i<index_num;i++)
      {
        re+=(dataBase.get(index_ans[i]).stuInfo()+"\r\n");
        dataBase.remove(index_ans[i]);
      }
      return re;
    }
  }
  public String delete(String infomation,int num) {//模糊删除  num=1学号删除 2:名字删除 3:成绩删除
    int index_ans[]=new int [dataBase.size()];
    int index_num=0;
    if(num==1) {//学号删除
      for(int i=0;i<dataBase.size();i++)
        if(dataBase.get(i).stuNo.equals(infomation))
          index_ans[index_num++]=i;
      }else if(num==2) {
        for(int i=0;i<dataBase.size();i++)
          if(dataBase.get(i).name.equals(infomation))
            index_ans[index_num++]=i;
      }else if(num==3) {
        for(int i=0;i<dataBase.size();i++)
          if(dataBase.get(i).grade==Double.valueOf(infomation))
            index_ans[index_num++]=i;
      }
    if(index_num==0) return "找不到";
    else {
      String re="";
      for(int i=0;i<index_num;i++)
      {
        re+=(dataBase.get(index_ans[i]).stuInfo()+"\r\n");
        dataBase.remove(index_ans[i]);
      }
      return re;
    }
  }


  public void sortSub() {
    Collections.sort(dataBase, new Comparator<Student>() {
      public int compare(Student stu1, Student stu2) {
          if(stu1.grade<stu2.grade) return 1;
          else if(stu1.grade>stu2.grade) return -1;
          else return 0;
      }
      
    });
  }
  
  public void sortAdd() {
    Collections.sort(dataBase, new Comparator<Student>() {
      public int compare(Student stu1, Student stu2) {
          if(stu1.grade>stu2.grade) return 1;
          else if(stu1.grade<stu2.grade) return -1;
          else return 0;
      }
      
    });
  }
}

3.User类(表示用户的单元)

同时实现了文件操作相关功能(或许叫文件类更合适,懒的改了)

package studentAndFileAction;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class User {
  int load_num=0;
  File file;
  public StudentGroup studentGroup=new StudentGroup();
  public String file_open() {//文件打开
    try {
      file=new File("C:/student.txt");
      return "==>找到学生信息记录存储文件,程序正常启动\r\n==>请按读取记录获取学生信息\r\n";
    } catch (Exception e) {
      return "无法在指定路径找到学生记录\r\n请保证学生记录在C盘根目录下!\r\n";
    }
  }
  public void file_load_reset() {//存储后标志复位
    load_num=0;
  }
  public void file_load() {//记录加载
    try {
      FileReader cin=new FileReader(file);//打开文件
      if(load_num==0)
      {
        try {
          
          BufferedReader input=new BufferedReader(cin);
          while(true)
          {
            String oneStu=input.readLine();
            
            if(oneStu==null) break;
            String []infomation=oneStu.split(" ");
            studentGroup.add(new Student(infomation[0],infomation[1],infomation[2]));	
          }
          cin.close();
          input.close();
        } catch (IOException e) {
          // TODO 自动生成的 catch 块
          System.out.println("读写异常");
        }
        load_num++;
      }
      
      
    }catch (FileNotFoundException e) {
      System.out.println("文件找不到,系统退出");
      e.printStackTrace();
  }
  
  }
  public String file_store() {//存储
    
    try {
      FileWriter writer=new FileWriter(file);
      BufferedWriter write = new BufferedWriter(writer);
      for(Student stu:studentGroup.dataBase) {
        String out=stu.stuNo+" "+stu.name+" "+stu.grade;
          write.write(out);
          write.newLine();
      }
      write.close();
      writer.close();
      studentGroup.dataBase.clear();
      return "保存成功!!\r\n";
    } catch (IOException e) {
      // TODO 自动生成的 catch 块
      return "很遗憾,保存失败!!\r\n因为文件位置在C盘根目录下,请以管理员模式打开本程序\r\n";
    }
    
  } 

}

二、图形界面设计(graphical 包)

1.主窗体:MainFrame.java(主窗口)

package graphical;
import javax.swing.JOptionPane;
import java.awt.EventQueue;
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.JMenu;
import java.awt.Panel;
import java.awt.Label;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JDialog;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.SwingConstants;
import java.awt.Color;
import org.eclipse.wb.swing.FocusTraversalOnArray;


import studentAndFileAction.Student;
import studentAndFileAction.StudentGroup;
import studentAndFileAction.User;

import java.awt.Component;
import javax.swing.ImageIcon;
import javax.swing.JTable;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.DropMode;
import javax.swing.JTextArea;
import java.awt.Button;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.Box;
import java.awt.Toolkit;


public class Mainframe extends JFrame {

  private JPanel contentPane;
  static User yuheng=new User();
  static	JTextArea screen = new JTextArea();
  /**
   * Launch the application.
   */
  public static void main(String[] args) {
    
    EventQueue.invokeLater(new Runnable() {
     
      public void run() {
        try {
          Mainframe frame = new Mainframe();
          frame.setVisible(true);
          screen.append(yuheng.file_open());
          
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    });
  }
  public void display(JTextArea screen) {
    screen.setText("");
    for(Student stu:yuheng.studentGroup.dataBase) {
      screen.append(stu.stuInfo()+"\r\n");	
    }
  }

  /**
   * Create the frame.
   */
  public Mainframe() {
    setResizable(false);
    setIconImage(Toolkit.getDefaultToolkit().getImage("img\\\u56FE\u6807.jpg"));
    setTitle("\u5B66\u751F\u4FE1\u606F\u7BA1\u7406\u7CFB\u7EDF-\u4F5C\u4E1A12 by \u4E8E\u8861~");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 971, 603);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);
    
    JPanel Maintitle = new JPanel();
    Maintitle.setBackground(Color.WHITE);
    Maintitle.setBounds(26, 10, 905, 95);
    contentPane.add(Maintitle);
    Maintitle.setLayout(null);
    
    JLabel label = new JLabel("");
    label.setBounds(86, 0, 713, 95);
    Maintitle.add(label);
    label.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u5B66\u751F\u4FE1\u606F\u7BA1\u7406\u7CFB\u7EDF.png")));
    label.setFont(new Font("楷体", Font.BOLD, 41));
    
    JPanel name_input = new JPanel();
    name_input.setBounds(26, 125, 905, 45);
    contentPane.add(name_input);
    name_input.setLayout(null);
    
    JLabel label_1 = new JLabel("\u4FE1\u606F\u663E\u793A\uFF1A");
    label_1.setBounds(10, 4, 140, 38);
    name_input.add(label_1);
    label_1.setFont(new Font("微软雅黑", Font.BOLD, 28));
    
    JLabel label_2 = new JLabel("\u529F\u80FD\u5217\u8868\uFF1A");
    label_2.setFont(new Font("微软雅黑", Font.BOLD, 28));
    label_2.setBounds(464, 4, 145, 38);
    name_input.add(label_2);
    
    
    JPanel key_area = new JPanel();
    key_area.setBounds(487, 214, 444, 340);
    contentPane.add(key_area);
    key_area.setLayout(null);
    
    
    JButton read_info = new JButton("\u8BFB\u53D6\u8BB0\u5F55");
    
    read_info.setBounds(0, 7, 215, 77);
    key_area.add(read_info);
    read_info.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent arg0) {
        yuheng.file_load();
        display(screen);
      }
    });
    read_info.setFont(new Font("方正姚体", Font.PLAIN, 25));
    read_info.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u8BFB\u53D6\u6587\u4EF6.png")));
    read_info.setBackground(Color.WHITE);
    
    JButton store_info = new JButton("\u4FDD\u5B58\u8BB0\u5F55");
    store_info.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent arg0) {
        screen.append(yuheng.file_store());
        yuheng.file_load_reset();//重新可读
      }
    });
    store_info.setFont(new Font("方正姚体", Font.PLAIN, 25));
    store_info.setBackground(Color.WHITE);
    store_info.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u4FDD\u5B58\u6587\u4EF6.png")));
    store_info.setBounds(229, 7, 215, 77);
    key_area.add(store_info);
    
    JButton info_up = new JButton("\u5347\u5E8F\u6392\u5217");
    info_up.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent arg0) {
        yuheng.studentGroup.sortAdd();
        display(screen);
      }
    });
    info_up.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u5347\u5E8F.png")));
    info_up.setFont(new Font("方正姚体", Font.PLAIN, 25));
    info_up.setBackground(Color.WHITE);
    info_up.setBounds(0, 94, 215, 72);
    key_area.add(info_up);
    
    JButton info_down = new JButton("\u964D\u5E8F\u6392\u5217");
    info_down.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent arg0) {
        yuheng.studentGroup.sortSub();
        display(screen);
      }
    });
    info_down.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u964D\u5E8F.png")));
    info_down.setFont(new Font("方正姚体", Font.PLAIN, 25));
    info_down.setBackground(Color.WHITE);
    info_down.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
        yuheng.studentGroup.sortSub();
        display(screen);
      }
    });
    info_down.setBounds(229, 94, 215, 70);
    key_area.add(info_down);
    
    JButton add_info = new JButton("\u589E\u52A0\u8BB0\u5F55");
    add_info.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent arg0) {
         new add_students(Mainframe.this).setVisible(true);
      }
    });
    add_info.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u589E\u52A0.png")));
    add_info.setBackground(Color.WHITE);
    add_info.setFont(new Font("方正姚体", Font.PLAIN, 25));
    add_info.setBounds(0, 176, 215, 72);
    key_area.add(add_info);
    
    JButton delete_info = new JButton("\u5220\u9664\u8BB0\u5F55");
    delete_info.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
        new Delete_student(Mainframe.this).setVisible(true);
      }
    });
    delete_info.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u5220\u9664.png")));
    delete_info.setBackground(Color.WHITE);
    delete_info.setFont(new Font("方正姚体", Font.PLAIN, 25));
    delete_info.setBounds(229, 176, 215, 72);
    key_area.add(delete_info);
    
    JButton query_info = new JButton("\u67E5\u627E\u8BB0\u5F55");
    query_info.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent arg0) {
         new Query_students(Mainframe.this).setVisible(true);
      }
    });
    query_info.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u67E5\u8BE2.png")));
    query_info.setBackground(Color.WHITE);
    query_info.setFont(new Font("方正姚体", Font.PLAIN, 25));
    query_info.setBounds(0, 258, 215, 72);
    key_area.add(query_info);
    
    JButton modify_info = new JButton("\u4FEE\u6539\u8BB0\u5F55");
    modify_info.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
        new Alter_students_info(Mainframe.this).setVisible(true);
        
      }
    });
    modify_info.setIcon(new ImageIcon(Mainframe.class.getResource("/img/\u4FEE\u6539.png")));
    modify_info.setBackground(Color.WHITE);
    modify_info.setForeground(Color.BLACK);
    modify_info.setFont(new Font("方正姚体", Font.PLAIN, 25));
    modify_info.setBounds(229, 258, 215, 72);
    key_area.add(modify_info);
    
    JPanel panel = new JPanel();
    panel.setBounds(26, 180, 444, 374);
    contentPane.add(panel);
    panel.setLayout(null);
    
    JLabel info = new JLabel("\u5B66\u53F7                \u59D3\u540D                               \u6210\u7EE9");
    info.setBounds(0, 10, 343, 24);
    info.setHorizontalAlignment(SwingConstants.CENTER);
    panel.add(info);
    info.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    info.setForeground(Color.BLACK);
    info.setBackground(Color.WHITE);
    
    JScrollPane scrollPane = new JScrollPane();
    scrollPane.setBounds(0, 38, 444, 327);
    panel.add(scrollPane);
    scrollPane.setViewportView(screen);
    
    //JTextArea screen = new JTextArea();
    screen.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    screen.setEditable(false);
    screen.setLineWrap(true);
    
    JLabel lblNewLabel = new JLabel("New label");
    lblNewLabel.setBounds(312, 180, 294, 251);
    contentPane.add(lblNewLabel);

  }

}

2.添加学生 Add_students.java(对话框)

package graphical;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import studentAndFileAction.Student;

import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.JTextArea;

public class add_students extends JDialog {

  private final JPanel contentPanel = new JPanel();
  private JTextField no;
  private JTextField name;
  private JTextField grade;
  JTextArea status = new JTextArea();

  /**
   * Launch the application.
   */
  public static void main(Mainframe gra) {
    try {
      add_students dialog = new add_students(gra);
      dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
      dialog.setVisible(true);
      dialog.setLocation(392, 180);
      
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * Create the dialog.
   */
  public add_students(Mainframe gra) {
    setResizable(false);
    getContentPane().setEnabled(false);
    this.setTitle("请输入需要添加学生的基本信息");
    
    setBounds(100, 100, 549, 332);
    getContentPane().setLayout(new BorderLayout());
    contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
    getContentPane().add(contentPanel, BorderLayout.CENTER);
    contentPanel.setLayout(null);
    {
      JButton okButton = new JButton("确定");
      okButton.setFont(new Font("幼圆", Font.PLAIN, 28));
      okButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          status.setText("");
          if(no.getText().trim().equals("")||name.getText().trim().equals("")||grade.getText().trim().equals("")){
            status.setText("数据非法!");
            return;
          }
          Student stu=new Student(no.getText().trim(),name.getText().trim(),grade.getText().trim());
          gra.yuheng.studentGroup.add(stu);
          status.setText("操作成功!");
        }
      });
      okButton.setBounds(261, 201, 96, 40);
      contentPanel.add(okButton);
      okButton.setActionCommand("OK");
      getRootPane().setDefaultButton(okButton);
    }
    {
      JButton cancelButton = new JButton("清空");
      cancelButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          no.setText("");
          grade.setText("");
          name.setText("");
          status.setText("");
        }
      });
      cancelButton.setFont(new Font("幼圆", Font.PLAIN, 28));
      cancelButton.setBounds(413, 202, 102, 39);
      contentPanel.add(cancelButton);
      cancelButton.setActionCommand("Cancel");
    }
    
    JPanel panel_4 = new JPanel();
    panel_4.setBounds(22, 23, 216, 247);
    contentPanel.add(panel_4);
    panel_4.setLayout(null);
    
    JPanel stuName = new JPanel();
    stuName.setBounds(0, 69, 216, 59);
    panel_4.add(stuName);
    stuName.setLayout(null);
    
    JLabel lblNewLabel_1 = new JLabel("\u59D3\u540D");
    lblNewLabel_1.setBounds(0, 0, 61, 59);
    stuName.add(lblNewLabel_1);
    lblNewLabel_1.setBackground(Color.WHITE);
    lblNewLabel_1.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    name = new JTextField();
    name.setFont(new Font("宋体", Font.BOLD, 19));
    name.setBounds(63, 14, 153, 33);
    stuName.add(name);
    name.setColumns(10);
    
    JPanel stuGrade = new JPanel();
    stuGrade.setBounds(0, 124, 216, 59);
    panel_4.add(stuGrade);
    stuGrade.setLayout(null);
    
    JLabel lblNewLabel_2 = new JLabel("\u6210\u7EE9");
    lblNewLabel_2.setBounds(0, 0, 50, 59);
    stuGrade.add(lblNewLabel_2);
    lblNewLabel_2.setBackground(Color.WHITE);
    lblNewLabel_2.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    grade = new JTextField();
    grade.setFont(new Font("宋体", Font.BOLD, 19));
    grade.setBounds(63, 19, 153, 33);
    stuGrade.add(grade);
    grade.setColumns(10);
    
    JPanel stuNO = new JPanel();
    stuNO.setBounds(0, 10, 216, 49);
    panel_4.add(stuNO);
    stuNO.setLayout(null);
    
    JLabel lblNewLabel = new JLabel("\u5B66\u53F7");
    lblNewLabel.setBounds(0, 0, 81, 49);
    stuNO.add(lblNewLabel);
    lblNewLabel.setBackground(Color.WHITE);
    lblNewLabel.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    no = new JTextField();
    no.setFont(new Font("宋体", Font.BOLD, 19));
    no.setBounds(64, 10, 152, 33);
    stuNO.add(no);
    no.setColumns(10);
    
    JPanel panel = new JPanel();
    panel.setBounds(0, 193, 216, 44);
    panel_4.add(panel);
    panel.setLayout(null);
    status.setForeground(Color.BLACK);
    status.setFont(new Font("幼圆", Font.BOLD, 18));
    status.setEditable(false);
    
    
    status.setBounds(64, 11, 152, 27);
    panel.add(status);
    
    JLabel label = new JLabel("\u72B6\u6001");
    label.setBounds(0, 0, 64, 40);
    panel.add(label);
    label.setBackground(Color.WHITE);
    label.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    JLabel lblNewLabel_3 = new JLabel("");
    lblNewLabel_3.setIcon(new ImageIcon(add_students.class.getResource("/img/\u8F93\u5165.png")));
    lblNewLabel_3.setBounds(291, 23, 181, 165);
    contentPanel.add(lblNewLabel_3);
  }
}

3.删除记录 Delete_students.java(对话框)

package graphical;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import studentAndFileAction.Student;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;

public class Delete_student extends JDialog {

  private final JPanel contentPanel = new JPanel();
  private JTextField no;
  private JTextField name;
  private JTextField grade;
  JTextArea status = new JTextArea();
  JTextArea screen = new JTextArea(
      "\r\n"
      + "注意:本程序提供精确删除和模糊删除两种删除方式 \r\n"
      + "1.精准删除模式\r\n" 
      + "  输入学号,姓名等两项参数,返回删除结果。\r\n" 
      + "2.模糊删除模式\r\n" 
      + "  输入学号,姓名,成绩中的任意一个参数,返回全部的删除结果\r\n"
      + "  ---------------------------------------\r\n"
      + "    建议在删除前进行查询操作,避免误删除(删除操作不可撤销)\r\n");

  /**
   * Launch the application.
   */
  public static void main(Mainframe gra) {
    try {
      Delete_student dialog = new Delete_student(gra);
      dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
      dialog.setVisible(true);
      dialog.setLocation(392, 180);
      
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * Create the dialog.
   */
  public Delete_student(Mainframe gra) {
    setResizable(false);
    this.setTitle("\u8BF7\u8F93\u5165\u9700\u8981\u5220\u9664\u5B66\u751F\u7684\u57FA\u672C\u4FE1\u606F");
    
    setBounds(100, 100, 875, 397);
    getContentPane().setLayout(new BorderLayout());
    contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
    getContentPane().add(contentPanel, BorderLayout.CENTER);
    {
      JButton delete = new JButton("\u5220\u9664");
      delete.setBounds(620, 290, 90, 39);
      delete.setFont(new Font("幼圆", Font.PLAIN, 20));
      delete.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          status.setText("");
          if(no.getText().trim().equals("")&&name.getText().trim().equals("")&&grade.getText().trim().equals("")){
            status.setText("请输入数据");
            return;
          }else
            if((!no.getText().trim().equals(""))&&!(name.getText().trim().equals(""))) {
              screen.setText(gra.yuheng.studentGroup.delete(no.getText().trim(),name.getText().trim()));
              status.setText("删除成功!");
            }
              
          else
            if(!no.getText().trim().equals(""))
            {
              screen.setText(gra.yuheng.studentGroup.delete(no.getText().trim(),1));
              status.setText("删除成功!");
            }
          else if(!name.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.delete(name.getText().trim(),2));
            status.setText("删除成功!");
          }
          else if(!grade.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.delete(grade.getText().trim(),3));
            status.setText("删除成功!");
          }
        }
      });
      contentPanel.setLayout(null);
      contentPanel.add(delete);
      delete.setActionCommand("OK");
      getRootPane().setDefaultButton(delete);
    }
    {
      JButton cancelButton = new JButton("清空");
      cancelButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          no.setText("");
          grade.setText("");
          name.setText("");
          status.setText("");
          screen.setText("");
        }
      });
      cancelButton.setBounds(720, 290, 90, 39);
      cancelButton.setFont(new Font("幼圆", Font.PLAIN, 20));
      contentPanel.add(cancelButton);
      cancelButton.setActionCommand("Cancel");
    }
    
    JPanel panel_4 = new JPanel();
    panel_4.setBounds(526, 27, 284, 247);
    contentPanel.add(panel_4);
    panel_4.setLayout(null);
    
    JPanel stuName = new JPanel();
    stuName.setBounds(0, 69, 284, 59);
    panel_4.add(stuName);
    stuName.setLayout(null);
    
    JLabel lblNewLabel_1 = new JLabel("\u59D3\u540D");
    lblNewLabel_1.setBounds(0, 0, 61, 59);
    stuName.add(lblNewLabel_1);
    lblNewLabel_1.setBackground(Color.WHITE);
    lblNewLabel_1.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    name = new JTextField();
    name.setFont(new Font("宋体", Font.BOLD, 19));
    name.setBounds(63, 14, 211, 33);
    stuName.add(name);
    name.setColumns(10);
    
    JPanel stuGrade = new JPanel();
    stuGrade.setBounds(0, 124, 284, 59);
    panel_4.add(stuGrade);
    stuGrade.setLayout(null);
    
    JLabel lblNewLabel_2 = new JLabel("\u6210\u7EE9");
    lblNewLabel_2.setBounds(0, 0, 50, 59);
    stuGrade.add(lblNewLabel_2);
    lblNewLabel_2.setBackground(Color.WHITE);
    lblNewLabel_2.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    grade = new JTextField();
    grade.setFont(new Font("宋体", Font.BOLD, 19));
    grade.setBounds(63, 19, 211, 33);
    stuGrade.add(grade);
    grade.setColumns(10);
    
    JPanel stuNO = new JPanel();
    stuNO.setBounds(0, 10, 284, 49);
    panel_4.add(stuNO);
    stuNO.setLayout(null);
    
    JLabel lblNewLabel = new JLabel("\u5B66\u53F7");
    lblNewLabel.setBounds(0, 0, 81, 49);
    stuNO.add(lblNewLabel);
    lblNewLabel.setBackground(Color.WHITE);
    lblNewLabel.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    no = new JTextField();
    no.setFont(new Font("宋体", Font.BOLD, 19));
    no.setBounds(64, 10, 210, 33);
    stuNO.add(no);
    no.setColumns(10);
    
    JPanel panel = new JPanel();
    panel.setBounds(0, 193, 284, 44);
    panel_4.add(panel);
    panel.setLayout(null);
    status.setForeground(Color.BLACK);
    status.setFont(new Font("幼圆", Font.BOLD, 18));
    status.setEnabled(false);
    status.setEditable(false);
    
    
    status.setBounds(64, 11, 210, 27);
    panel.add(status);
    
    JLabel label = new JLabel("\u72B6\u6001");
    label.setBounds(0, 0, 64, 40);
    panel.add(label);
    label.setBackground(Color.WHITE);
    label.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    
    screen.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    screen.setEditable(false);
    screen.setLineWrap(true);
    screen.setBounds(10, 58, 458, 271);
    contentPanel.add(screen);
    
    JLabel label_1 = new JLabel("\u5B66\u53F7                \u59D3\u540D                               \u6210\u7EE9");
    label_1.setHorizontalAlignment(SwingConstants.LEFT);
    label_1.setForeground(Color.BLACK);
    label_1.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    label_1.setBackground(Color.WHITE);
    label_1.setBounds(10, 27, 458, 24);
    contentPanel.add(label_1);
    
    JButton button = new JButton("\u67E5\u8BE2");
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
          status.setText("");
          if(no.getText().trim().equals("")&&name.getText().trim().equals("")&&grade.getText().trim().equals("")){
            status.setText("请输入数据");
            return;
          }else
            if((!no.getText().trim().equals(""))&&!(name.getText().trim().equals(""))) {
              screen.setText(gra.yuheng.studentGroup.lookup(no.getText().trim(),name.getText().trim()));
              status.setText("查询成功!");
            }
              
          else
            if(!no.getText().trim().equals(""))
            {
              screen.setText(gra.yuheng.studentGroup.lookup(no.getText().trim(),1));
              status.setText("查询成功!");
            }
          else if(!name.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.lookup(name.getText().trim(),2));
            status.setText("查询成功!");
          }
          else if(!grade.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.lookup(grade.getText().trim(),3));
            status.setText("查询成功!");
          }
      }
    });
    button.setFont(new Font("幼圆", Font.PLAIN, 20));
    button.setActionCommand("OK");
    button.setBounds(526, 290, 84, 39);
    contentPanel.add(button);
  }
}

4.查询记录 Query_students.java(对话框)

package graphical;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import studentAndFileAction.Student;

import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;

public class Query_students extends JDialog {

  private final JPanel contentPanel = new JPanel();
  private JTextField no;
  private JTextField name;
  private JTextField grade;
  JTextArea status = new JTextArea();
  JTextArea screen = new JTextArea(
      "\r\n\r\n"
      + "注意:本程序提供精确匹配和模糊匹配两种查询方式 \r\n"
      + "1.精准匹配模式\r\n" 
      + "  输入学号,姓名等两项参数,返回查询结果。\r\n" 
      + "2.模糊匹配模式\r\n" 
      + "  输入学号,姓名,成绩中的任意一个参数,返回全部的查询结果\r\n");

  /**
   * Launch the application.
   */
  public static void main(Mainframe gra) {
    try {
      Query_students dialog = new Query_students(gra);
      dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
      dialog.setVisible(true);
      dialog.setLocation(392, 180);
      
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * Create the dialog.
   */
  public Query_students(Mainframe gra) {
    setResizable(false);
    this.setTitle("\u8BF7\u8F93\u5165\u9700\u8981\u67E5\u8BE2\u5B66\u751F\u7684\u57FA\u672C\u4FE1\u606F");
    
    setBounds(100, 100, 763, 390);
    getContentPane().setLayout(new BorderLayout());
    contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
    getContentPane().add(contentPanel, BorderLayout.CENTER);
    {
      JButton okButton = new JButton("确定");
      okButton.setBounds(499, 289, 96, 40);
      okButton.setFont(new Font("幼圆", Font.PLAIN, 28));
      okButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          status.setText("");
          if(no.getText().trim().equals("")&&name.getText().trim().equals("")&&grade.getText().trim().equals("")){
            status.setText("请输入数据");
            return;
          }else
            if((!no.getText().trim().equals(""))&&!(name.getText().trim().equals(""))) {
              screen.setText(gra.yuheng.studentGroup.lookup(no.getText().trim(),name.getText().trim()));
              status.setText("查询成功!");
            }
              
          else
            if(!no.getText().trim().equals(""))
            {
              screen.setText(gra.yuheng.studentGroup.lookup(no.getText().trim(),1));
              status.setText("查询成功!");
            }
          else if(!name.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.lookup(name.getText().trim(),2));
            status.setText("查询成功!");
          }
          else if(!grade.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.lookup(grade.getText().trim(),3));
            status.setText("查询成功!");
          }
          
        }
      });
      contentPanel.setLayout(null);
      contentPanel.add(okButton);
      okButton.setActionCommand("OK");
      getRootPane().setDefaultButton(okButton);
    }
    {
      JButton cancelButton = new JButton("清空");
      cancelButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          no.setText("");
          grade.setText("");
          name.setText("");
          status.setText("");
          screen.setText("");
        }
      });
      cancelButton.setBounds(635, 290, 102, 39);
      cancelButton.setFont(new Font("幼圆", Font.PLAIN, 28));
      contentPanel.add(cancelButton);
      cancelButton.setActionCommand("Cancel");
    }
    
    JPanel panel_4 = new JPanel();
    panel_4.setBounds(502, 27, 216, 247);
    contentPanel.add(panel_4);
    panel_4.setLayout(null);
    
    JPanel stuName = new JPanel();
    stuName.setBounds(0, 69, 216, 59);
    panel_4.add(stuName);
    stuName.setLayout(null);
    
    JLabel lblNewLabel_1 = new JLabel("\u59D3\u540D");
    lblNewLabel_1.setBounds(0, 0, 61, 59);
    stuName.add(lblNewLabel_1);
    lblNewLabel_1.setBackground(Color.WHITE);
    lblNewLabel_1.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    name = new JTextField();
    name.setFont(new Font("宋体", Font.BOLD, 19));
    name.setBounds(63, 14, 153, 33);
    stuName.add(name);
    name.setColumns(10);
    
    JPanel stuGrade = new JPanel();
    stuGrade.setBounds(0, 124, 216, 59);
    panel_4.add(stuGrade);
    stuGrade.setLayout(null);
    
    JLabel lblNewLabel_2 = new JLabel("\u6210\u7EE9");
    lblNewLabel_2.setBounds(0, 0, 50, 59);
    stuGrade.add(lblNewLabel_2);
    lblNewLabel_2.setBackground(Color.WHITE);
    lblNewLabel_2.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    grade = new JTextField();
    grade.setFont(new Font("宋体", Font.BOLD, 19));
    grade.setBounds(63, 19, 153, 33);
    stuGrade.add(grade);
    grade.setColumns(10);
    
    JPanel stuNO = new JPanel();
    stuNO.setBounds(0, 10, 216, 49);
    panel_4.add(stuNO);
    stuNO.setLayout(null);
    
    JLabel lblNewLabel = new JLabel("\u5B66\u53F7");
    lblNewLabel.setBounds(0, 0, 81, 49);
    stuNO.add(lblNewLabel);
    lblNewLabel.setBackground(Color.WHITE);
    lblNewLabel.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    no = new JTextField();
    no.setFont(new Font("宋体", Font.BOLD, 19));
    no.setBounds(64, 10, 152, 33);
    stuNO.add(no);
    no.setColumns(10);
    
    JPanel panel = new JPanel();
    panel.setBounds(0, 193, 216, 44);
    panel_4.add(panel);
    panel.setLayout(null);
    status.setForeground(Color.BLACK);
    status.setFont(new Font("幼圆", Font.BOLD, 18));
    status.setEnabled(false);
    status.setEditable(false);
    
    
    status.setBounds(64, 11, 152, 27);
    panel.add(status);
    
    JLabel label = new JLabel("\u72B6\u6001");
    label.setBounds(0, 0, 64, 40);
    panel.add(label);
    label.setBackground(Color.WHITE);
    label.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    
    screen.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    screen.setEditable(false);
    screen.setLineWrap(true);
    screen.setBounds(10, 58, 458, 271);
    contentPanel.add(screen);
    
    JLabel label_1 = new JLabel("\u5B66\u53F7                \u59D3\u540D                               \u6210\u7EE9");
    label_1.setHorizontalAlignment(SwingConstants.LEFT);
    label_1.setForeground(Color.BLACK);
    label_1.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    label_1.setBackground(Color.WHITE);
    label_1.setBounds(10, 27, 458, 24);
    contentPanel.add(label_1);
  }
}

5.修改记录 Alter_students_info.java(对话框)

package graphical;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import studentAndFileAction.Student;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.ImageIcon;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;

public class Alter_students_info extends JDialog {

  private final JPanel contentPanel = new JPanel();
  private JTextField no;
  private JTextField name;
  private JTextField grade;
  JTextArea status = new JTextArea();
  JTextArea screen = new JTextArea(
      "\r\n"
      + "注意:对学生信息进行修改 \r\n"
      + "使用方法\r\n" 
      + "  输入学号,再输入姓名和成绩,把学号对应的信息修改\r\n" 
      + "  建议在修改前进行查询操作,避免误修改(修改操作不可撤销)\r\n");

  /**
   * Launch the application.
   */
  public static void main(Mainframe gra) {
    try {
      Alter_students_info dialog = new Alter_students_info(gra);
      dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
      dialog.setVisible(true);
      dialog.setLocation(392, 180);
      
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   * Create the dialog.
   */
  public Alter_students_info(Mainframe gra) {
    setResizable(false);
    this.setTitle("\u8BF7\u8F93\u5165\u9700\u8981\u4FEE\u6539\u5B66\u751F\u7684\u57FA\u672C\u4FE1\u606F");
    
    setBounds(100, 100, 875, 470);
    getContentPane().setLayout(new BorderLayout());
    contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
    getContentPane().add(contentPanel, BorderLayout.CENTER);
    {
      JButton delete = new JButton("\u4FEE\u6539");
      delete.setBounds(620, 347, 90, 39);
      delete.setFont(new Font("幼圆", Font.PLAIN, 20));
      delete.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          status.setText("");
          if(no.getText().trim().equals("")){
            status.setText("请输入数据");
            return;
          }else
            if(!no.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.modify(no.getText().trim(),name.getText().trim(),grade.getText().trim()));
            status.setText("修改成功!");
          }
        }
      });
      contentPanel.setLayout(null);
      contentPanel.add(delete);
      delete.setActionCommand("OK");
      getRootPane().setDefaultButton(delete);
    }
    {
      JButton cancelButton = new JButton("清空");
      cancelButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
          no.setText("");
          grade.setText("");
          name.setText("");
          status.setText("");
          screen.setText("");
        }
      });
      cancelButton.setBounds(720, 347, 90, 39);
      cancelButton.setFont(new Font("幼圆", Font.PLAIN, 20));
      contentPanel.add(cancelButton);
      cancelButton.setActionCommand("Cancel");
    }
    
    JPanel panel_4 = new JPanel();
    panel_4.setBounds(526, 25, 284, 312);
    contentPanel.add(panel_4);
    panel_4.setLayout(null);
    
    JPanel stuName = new JPanel();
    stuName.setBounds(0, 134, 284, 59);
    panel_4.add(stuName);
    stuName.setLayout(null);
    
    JLabel lblNewLabel_1 = new JLabel("\u59D3\u540D");
    lblNewLabel_1.setBounds(0, 0, 61, 59);
    stuName.add(lblNewLabel_1);
    lblNewLabel_1.setBackground(Color.WHITE);
    lblNewLabel_1.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    name = new JTextField();
    name.setFont(new Font("宋体", Font.BOLD, 19));
    name.setBounds(63, 14, 211, 33);
    stuName.add(name);
    name.setColumns(10);
    
    JPanel stuGrade = new JPanel();
    stuGrade.setBounds(0, 189, 284, 59);
    panel_4.add(stuGrade);
    stuGrade.setLayout(null);
    
    JLabel lblNewLabel_2 = new JLabel("\u6210\u7EE9");
    lblNewLabel_2.setBounds(0, 0, 50, 59);
    stuGrade.add(lblNewLabel_2);
    lblNewLabel_2.setBackground(Color.WHITE);
    lblNewLabel_2.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    grade = new JTextField();
    grade.setFont(new Font("宋体", Font.BOLD, 19));
    grade.setBounds(63, 19, 211, 33);
    stuGrade.add(grade);
    grade.setColumns(10);
    
    JPanel stuNO = new JPanel();
    stuNO.setBounds(0, 49, 284, 49);
    panel_4.add(stuNO);
    stuNO.setLayout(null);
    
    JLabel lblNewLabel = new JLabel("\u5B66\u53F7");
    lblNewLabel.setBounds(0, 0, 81, 49);
    stuNO.add(lblNewLabel);
    lblNewLabel.setBackground(Color.WHITE);
    lblNewLabel.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    no = new JTextField();
    no.setFont(new Font("宋体", Font.BOLD, 19));
    no.setBounds(64, 10, 210, 33);
    stuNO.add(no);
    no.setColumns(10);
    
    JPanel panel = new JPanel();
    panel.setBounds(0, 258, 284, 44);
    panel_4.add(panel);
    panel.setLayout(null);
    status.setForeground(Color.BLACK);
    status.setFont(new Font("幼圆", Font.BOLD, 18));
    status.setEnabled(false);
    status.setEditable(false);
    
    
    status.setBounds(64, 11, 210, 27);
    panel.add(status);
    
    JLabel label = new JLabel("\u72B6\u6001");
    label.setBounds(0, 0, 64, 40);
    panel.add(label);
    label.setBackground(Color.WHITE);
    label.setFont(new Font("方正姚体", Font.PLAIN, 25));
    
    JLabel label_2 = new JLabel("\u8F93\u5165\u67E5\u8BE2\u56E0\u5B50");
    label_2.setFont(new Font("宋体", Font.PLAIN, 16));
    label_2.setBounds(0, 10, 132, 37);
    panel_4.add(label_2);
    
    JLabel label_3 = new JLabel("\u8F93\u5165\u4FEE\u6539\u540E\u7684\u4FE1\u606F");
    label_3.setFont(new Font("宋体", Font.PLAIN, 16));
    label_3.setBounds(0, 105, 184, 29);
    panel_4.add(label_3);
    
    
    screen.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    screen.setEditable(false);
    screen.setLineWrap(true);
    screen.setBounds(10, 58, 458, 328);
    contentPanel.add(screen);
    
    JLabel label_1 = new JLabel("\u5B66\u53F7                \u59D3\u540D                               \u6210\u7EE9");
    label_1.setHorizontalAlignment(SwingConstants.LEFT);
    label_1.setForeground(Color.BLACK);
    label_1.setFont(new Font("微软雅黑", Font.PLAIN, 18));
    label_1.setBackground(Color.WHITE);
    label_1.setBounds(10, 27, 458, 24);
    contentPanel.add(label_1);
    
    JButton button = new JButton("\u67E5\u8BE2");
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent arg0) {
          status.setText("");
          if(no.getText().trim().equals("")&&name.getText().trim().equals("")&&grade.getText().trim().equals("")){
            status.setText("请输入数据");
            return;
          }else
            if((!no.getText().trim().equals(""))&&!(name.getText().trim().equals(""))) {
              screen.setText(gra.yuheng.studentGroup.lookup(no.getText().trim(),name.getText().trim()));
              status.setText("查询成功!");
            }
              
          else
            if(!no.getText().trim().equals(""))
            {
              screen.setText(gra.yuheng.studentGroup.lookup(no.getText().trim(),1));
              status.setText("查询成功!");
            }
          else if(!name.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.lookup(name.getText().trim(),2));
            status.setText("查询成功!");
          }
          else if(!grade.getText().trim().equals("")){
            screen.setText(gra.yuheng.studentGroup.lookup(grade.getText().trim(),3));
            status.setText("查询成功!");
          }
      }
    });
    button.setFont(new Font("幼圆", Font.PLAIN, 20));
    button.setActionCommand("OK");
    button.setBounds(526, 347, 84, 39);
    contentPanel.add(button);
  }
}

资源文件:图标与标题(放于工程文件src下)

img(图标文件)


工程文件:

作业12-图形界面于衡


终于敲完啦,满满的自豪感

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