需求
编写图书借阅程序，可以处理简单的书籍借阅情况，包括借书和还书等。图书类的数据成员包括书名、书号和借书学生等；方法包括借书、还书和显示书籍信息等。学生类的数据成员包括姓名、学号和所借书籍等；方法包括显示学生信息等。将数据保存在数据库中或文件中，采用图形化用户界面，实现图书的入库，借阅和归还。
代码 /* **说明 书籍信息采用空格隔开，请勿在书名、书号之中添加空格 **运行代码 首先会在当前目录下检测是否存在books的文件，如果不存在，就创建一个，用来保存书籍信息; students 文件同理 所有的操作都是在内存中完成，只有关闭窗口时会将内存写回文件 */ import java.util.*; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import java.lang.*; class Book{ private String name; private String no; private String student_no; public void setName(String _name){ this.name = _name; } public void setNo(String _no){ this.no = _no; } public void setStudent_no(String _student_no){ this.student_no = _student_no; } public String getName(){ return this.name; } public String getNo(){ return this.no; } public String getStudent_no(){ return this.student_no; } public void Borrow(){ } public void Return(){ } } class Student{ private String name; private String no; private String books_no; public void setName(String _name){ this.name = _name; } public void setNo(String _no){ this.no = _no; } public void setBooks_no(String _books_no){ this.books_no = _books_no; } public void Show(){ System.out.println("Student[name="+ this.name +"Student_no="+ this.no +"books="+ this.books_no +"]"); } } class frame extends JFrame{ //按钮 private JButton borrow = new JButton("借书"); private JButton back = new JButton("还书"); private JButton append = new JButton("添加书籍"); private JButton query = new JButton("借阅查询"); private JButton list = new JButton("书籍查询"); private ArrayList
books = new ArrayList<>(); private ArrayList students = new ArrayList<>(); //Jpanel private JPanel options = new JPanel(); public frame(){ //读取文件 //书籍 File booksfile = new File("./books"); if(!booksfile.exists()){ try{ booksfile.createNewFile(); } catch (Exception e){ System.out.println("书籍文件创建失败哦~"); } } //学生 File studentsfile = new File("./students"); if(!studentsfile.exists()){ try{ studentsfile.createNewFile(); } catch (Exception e){ System.out.println("学生文件创建失败哦~"); } } //将书籍信息加载到内存 try { BufferedReader reader = new BufferedReader(new FileReader("./books")); String line; while ((line = reader.readLine()) != null) { String[] info = line.split(""); Book book = new Book(); book.setName(info[0]); book.setNo(info[1]); try{ book.setStudent_no(info[2]); } catch (Exception e) { System.out.println(e); } books.add(book); System.out.println(line); } reader.close(); } catch (IOException e) { e.printStackTrace(); } //将学生信息加载到内存 try { BufferedReader reader = new BufferedReader(new FileReader("./students")); String line; while ((line = reader.readLine()) != null) { String[] info = line.split(""); Student student = new Student(); student.setName(info[0]); student.setNo(info[1]); try{ student.setBooks_no(info[2]); } catch(Exception e){ System.out.println(e); } students.add(student); System.out.println(line); } reader.close(); } catch (IOException e) { e.printStackTrace(); } //获取窗口大小 Toolkit kit = Toolkit.getDefaultToolkit(); Dimension screenSize = kit.getScreenSize(); int screenw = screenSize.width;//屏幕的宽 int screenh = screenSize.height;//屏幕的高 //设置屏幕的宽和高 int windowsWedth = 800; int windowsHeight = 450; //设置剧中 //坐标x int x = (screenw - windowsWedth)/2; //坐标y int y = (screenh - windowsHeight)/2; //Jpanel添加按钮 options.add(borrow); options.add(back); options.add(append); options.add(query); options.add(list); //绑定借书功能 borrow.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ String book_name = JOptionPane.showInputDialog("请输入书名："); if(book_name == null){ return ; } boolean find = false; Book book = new Book(); for(Book tmp : books){ if(tmp.getName().equals(book_name)){ find = true; book = tmp; break; } } if(find){ if(book.getStudent_no() == null){ String student_no = JOptionPane.showInputDialog("请输入你的学号："); book.setStudent_no(student_no); JOptionPane.showMessageDialog(null,"借阅成功！"); } else{ JOptionPane.showMessageDialog(null,"书籍已经被"+ book.getStudent_no() +"借走了嗷~"); } } else{ JOptionPane.showMessageDialog(null,"未发现书籍"); } } }); //还书 back.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ String student_no = JOptionPane.showInputDialog("请输入学号:"); if(student_no == null){ return ; } ArrayList borrowed_books = new ArrayList<>(); boolean find = false; for(Book book : books){ if(book.getStudent_no() != null){ if(book.getStudent_no().equals(student_no)){ find = true; borrowed_books.add(book); } } } if(!find){ JOptionPane.showMessageDialog(null,"未找到记录"); } else{ JPanel list = new JPanel(); JButton sure_back = new JButton("确认归还"); JCheckBox[] checkBoxs = new JCheckBox[borrowed_books.size()]; for(int i=0; i"; boolean find = false; for(Book book : books){ if(book.getStudent_no() != null){ if(book.getStudent_no().equals(student_no)){ find = true; info += book.getName() +""+ book.getNo() +"
"; } } } if(!find){ JOptionPane.showMessageDialog(null,"未找到记录"); } else{ JOptionPane.showMessageDialog(null, info); } } }); //展示书籍 list.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ String info =""; boolean find = false; for(Book book : books){ find = true; info += book.getName() +""+ book.getNo() +"
"; } if(!find){ JOptionPane.showMessageDialog(null,"未找到记录"); } else{ JOptionPane.showMessageDialog(null, info); } } }); // 程序关闭时将内存写回文件 Thread shutdownHook = new Thread() { @Override public void run() { try{ FileWriter fw = new FileWriter("./books"); for(Book book : books){ fw.write(book.getName() +""+ book.getNo()); if(book.getStudent_no() != null){ fw.write(""+ book.getStudent_no() +"\n"); } else{ fw.write("\n"); } } fw.close(); } catch (Exception e) { System.out.println(e); } } }; // 注册关闭钩子 Runtime.getRuntime().addShutdownHook(shutdownHook); //整活 String makelive="CSDN关注
嗯嗯你说的对"; Font font = new Font("宋体",Font.PLAIN,20); JLabel makeLive = new JLabel(makelive); makeLive.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { try { Desktop.getDesktop().browse(new java.net.URI("https://blog.csdn.net/weixin_61133168?type=blog")); } catch (Exception ex) { ex.printStackTrace(); } } }); makeLive.setFont(font); makeLive.setForeground(Color.RED); makeLive.setHorizontalAlignment(SwingConstants.CENTER); //基础设置 this.setTitle("图书管理"); //this.add(editorPane,BorderLayout.CENTER); this.add(makeLive,BorderLayout.CENTER); this.add(options,BorderLayout.SOUTH); this.setVisible(true); this.setBounds(x,y,windowsWedth,windowsHeight); this.setDefaultCloseOperation(this.EXIT_ON_CLOSE); } } public class Main4{ public static void main(String [] args){ Scanner in = new Scanner(System.in); new frame(); in.close(); } } 代码分析 采用文件形式来保存信息，每次运行时加载到内存程序终止时将内存中的信息保存到文件 
