Database SQL JDBC Java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestThinApp {
  public static void main(String args[]) throws ClassNotFoundException,
      SQLException {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    //  DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
    Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@dssw2k01:1521:orcl", "scott", "tiger");
    Statement stmt = conn.createStatement();
    ResultSet rset = stmt.executeQuery("select 'Hello Thin driver tester '||USER||'!' result from dual");
    while (rset.next())
      System.out.println(rset.getString(1));
    rset.close();
    stmt.close();
    conn.close();
  }
}