唉！这个程序好像没有错，但执行不出来！

Question

class lx{
    String sql;
    Statement stmt;
    Connection con;
    BufferedReader bufferObj;
    ResultSet rs;
    public lx() {
        bufferObj=new BufferedReader(new InputStreamReader(System.in));
    }
    public void  establishConnection(){
        try{
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        }catch(ClassNotFoundException ce){
            System.out.print(ce.getMessage()) ;
        }
      try{
          String url = "jdbc:odbc:producted";
          con=DriverManager.getConnection(url);
          stmt=con.createStatement();
      }catch(SQLException ce){
          System.out.print(ce) ;
      }
    }
    public void searchRecord(){
        try{
          System.out.print("\n请输入数量：") ;
          int number=Integer.parseInt(bufferObj.readLine()) ;
         
          sql="select * from Product where Quantity="+number;
          rs=stmt.executeQuery(sql) ;
          while(rs.next()){
              System.out.print("\n产品代码:");
              System.out.print(rs.getInt(1)+"\t") ;
              System.out.print("\n产品名字:");
              System.out.print(rs.getString(2)+"\t") ;
              System.out.print("\n产品数量:");
              System.out.print(rs.getString(3)+"\t") ;
              System.out.println(" ") ;
          }
      }catch(SQLException ce){
          System.out.print(ce) ;
      }catch(Exception e){
          System.out.print(e) ;
      }
      }
      public void searchRecord1(){
          try{
              System.out.print("\n请输入产品代码:") ;
              int a=Integer.parseInt(bufferObj.readLine()) ;
             
              sql="select * from quest where ProductCode="+a;
              rs=stmt.executeQuery(sql);
              if(!rs.next() ){
                  System.out.print("\n查询失败") ;
              }else{
                  System.out.print("\n产品代码:");
                  System.out.print(rs.getInt(1)+"\t") ;
                  System.out.print("\n产品名字:");
                  System.out.print(rs.getString(2)+"\t") ;
                  System.out.print("\n产品数量:");
                  System.out.print(rs.getString(3)+"\t") ;
                  System.out.println(" ") ;
              }
          }catch(SQLException ce){
              System.out.print(ce);
          }catch(Exception e){
              System.out.print(e);
          }
      }
      public void display()throws IOException{
          char choice;
          while(true){
              System.out.println() ;
              System.out.print("1.根据产品代码进行搜索") ;
              System.out.println("2.根据数量进行搜索") ;
              System.out.println("3.退出\n\n") ;
              System.out.println("请输入你的选择....:") ;
              BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
              choice=(char)br.read();
              switch(choice){
                  case'1':
                      System.out.println("\n请按数量进行搜索");
                      searchRecord();
                      break;
                  case'2':
                      System.out.println("\n 请按产品代码进行搜索") ;
                      searchRecord1();
                      break;
                  case'3':
                      System.exit(0) ;
                      break;
                  default:
                      System.out.println("\n请输入一个有效数字") ;
                      break;
              }
          }
      }} 
 public class lxtext{
        public lxtext(){
           
        }
    public static void main(String[] args) throws Exception{
        lx lxobj = new lx();
        lxobj.display();
    }
 }

Answer 1

public class lxtext{
        public lxtext(){
         
        }
    public static void main(String[] args) throws Exception{
        lx lxobj = new lx();
        lxobj.display();
    }
}这个你放在了lx里面了

Answer 2

 -classpath "F:\java\第十三章\阶段作业我\LXproduct\classes;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\indicim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\im\thaiim.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\dnsns.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\sunjce_provider.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\ldapsec.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\ext\localedata.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jsse.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\plugin.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\sunrsasign.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\charsets.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\rt.jar;C:\Borland\JBuilder2005\jdk1.4\jre\lib\jce.jar;C:\Borland\JBuilder2005\jdk1.4\jre\javaws\javaws.jar;C:\Borland\JBuilder2005\jdk1.4\lib\tools.jar;C:\Borland\JBuilder2005\jdk1.4\lib\dt.jar;C:\Borland\JBuilder2005\jdk1.4\lib\htmlconverter.jar"  lxproduct.lxtest 1.根据数量进行搜索
2.根据产品代码进行搜索3.退出
请输入你的选择....:
1请按数量进行搜索请输入数量：80产品代码:java.sql.SQLException: [Microsoft][ODBC SQL Server Driver]对于造型说明无效的字符值
1.根据数量进行搜索
2.根据产品代码进行搜索3.退出
请输入你的选择....:
错误代码
就是不能显示啊
什么原因