System.out.printf("%s, version %s%n",
        conn.getMetaData().getDriverName(),
        conn.getMetaData().getDriverVersion());
// Microsoft JDBC Driver 7.4 for SQL Server, version 7.4.1.0

Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(
        "SELECT CAST(123 AS SQL_VARIANT), CAST('abc' AS SQL_VARIANT), CAST(3.14 AS SQL_VARIANT)");
rs.next();
Object o1 = rs.getObject(1);
System.out.println(o1.getClass().getName());
// java.lang.Integer

Object o2 = rs.getObject(2);
System.out.println(o2.getClass().getName());
// java.lang.String

Object o3 = rs.getObject(3);
System.out.println(o3.getClass().getName());
// java.math.BigDecimal