Can you describe what a ResultSet object is in the JDBC API and what its main purpose is?

In JDBC API, the ResultSet object represents a table of data obtained as a result of executing an SQL query against a database. Its main purpose is to provide a convenient interface for iterating over and reading the rows of the result.

Main characteristics of ResultSet:

• Allows sequential navigation through the result rows (usually via next() method).
• Provides methods to retrieve data from the current row by column name or index.
• Can be read-only or updatable, depending on settings.

Example usage:

Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("SELECT id, name FROM users");
while (rs.next()) {
    int id = rs.getInt("id");
    String name = rs.getString("name");
    System.out.println("User: " + id + ", " + name);
}
rs.close();
stmt.close();

Thus, ResultSet serves for convenient access to data retrieved from the database and is a key element in JDBC operations.