图书室借阅管理系统的程序，其java源代码

public String booknameString[]={"","","","","","",""};//建立一个五个元素的数组用来存储用户所借书的条形码 public String returndateString[]={"","","","","","",""}; //用于修改密码的显示标签和密码文本框 private JPasswordField newpassword = new JPasswordField(); private JPasswordField oldpassword = new JPasswordField(); private JLabel newPass = new JLabel("请输入新密码:"); private JLabel oldPass = new JLabel("请输入原密码:"); private JButton yes = new JButton("修改"); private JButton cancel = new JButton("取消"); private String MM_username=""; //用于记录登陆成功后的用户名