Java and Oracle: Selecting from a table

import java.sql.*;
import oracle.jdbc.pool.OracleDataSource;

class SelectTable {

  public static void main (String args[]) throws SQLException {
    OracleDataSource data_source = new OracleDataSource();

    data_source.setURL     ("jdbc:oracle:oci:@XE");
    data_source.setUser    ("rene"     );
    data_source.setPassword("my_secret");

    Connection connection = data_source.getConnection();

    PreparedStatement statement  = connection.prepareStatement(
      "select col_1, col_2, col_3 from jdbc_test " +
      " where col_1 in (?, ?)"
    );

    statement.setInt(1, 2);
    statement.setInt(2, 4);

    ResultSet result_set = statement.executeQuery();

    while (result_set.next()) {
      System.out.println(
        result_set.getString(1) + "\t" +
        result_set.getString(2) + "\t" +
        result_set.getString(3)
      );
    }
  }
}