How to Obtain Column Names from java.sql.ResultSet**

The java.sql.ResultSet interface provides access to database query results, but does not directly offer a method to retrieve column names using their indexes. To obtain this information, you can utilize the ResultSetMetaData metadata object.

The following steps demonstrate how to get column names as strings using column indexes:

1. Obtain the ResultSetMetaData object:

ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
ResultSetMetaData rsmd = rs.getMetaData();

2. Retrieve the column name:

String name = rsmd.getColumnName(1);

where 1 represents the index of the column whose name you want to retrieve.

Additionally, if your SQL query includes column aliases, you can use rsmd.getColumnLabel() to get the label name.

For instance, if you have the following query:

select x as y from table

rsmd.getColumnLabel() will return "y" for the first column.

By utilizing these techniques, you can easily retrieve column names from ResultSet objects in your Java code.