import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; public class testcon { public static void main(String[] arg0) { Connection con = null; PreparedStatement ps = null; ResultSet rs = null; try { Class.forName("oracle.jdbc.driver.OracleDriver"); con = DriverManager.getConnection("jdbc:oracle:thin:" + "@10.1.68.67:1521:orcl", "system", "manager"); ps = con.prepareStatement("select username from dba_users"); rs = ps.executeQuery(); while (rs.next()) { System.out.println(rs.getString("username")); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (rs != null) rs.close(); if (ps != null) ps.close(); if (con != null) con.close(); } catch (Exception e) { e.printStackTrace(); } } } }