SQL Exception!!

[allen gu]

String sn=edit1.getText();
try {
Connection con=null;
ResultSet rs;
ResultSetMetaData md;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
String url="jdbc dbc:test1";
con=DriverManager.getConnection(url,"","");
Statement s=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
String sql1="select Specialty from student where Sn='"+sn+"';" ;
rs=s.executeQuery(sql1);//sql1 is ok!
if(!rs.next())
{
labeld.setText("Can not find！");
}
else
{
String specialty3=rs.getString("Specialty");
System.out.println(specialty3);
String sql2="select * from "+specialty3+" where Sn='"+sn+"';";
System.out.println(sql2);
rs=s.executeQuery(sql2);// sql2 throw a sql Exception! "Illegal description index"

[Graham Thorpe]

try this way
String sql2="select * from '"+specialty3+"' where Sn='"+sn+"';";