ATM取款机用户界面设计写的

package atm.com; /** * 数据操作类 */ import java.sql.*; public class DataOperation { private Connection con; private Statement stmt; private ResultSet rs; /* * 链接数据库方法 */ public DataOperation() { try { Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); String URL = "jdbc:microsoft:sqlserver://localhost:1433;databasename=ATMTest"; String USER = "sa"; String PASS = ""; con = DriverManager.getConnection(URL, USER, PASS); stmt = con.createStatement(); } catch (Exception e1) { System.out.println(e1.toString()); } } /* * 返回某一特定数据集方法 */ public ResultSet getData(String sql)// 返回查询的数据集 { try { rs =