Timestamp format

import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;

import oracle.jdbc.driver.OracleDriver;

public class Principal
{	public static void main (String[] args)
	{	Connection conn = null;			
				
		try
		{	DriverManager.registerDriver (new OracleDriver()); 
			/*conn = DriverManager.getConnection
	    		("jdbc:oracle:thin:@sbd:1521:orcl","java01","java01");*/
	    	conn = DriverManager.getConnection
	    		("jdbc:oracle:oci:@127.0.0.1:1521:xe","java01","java01");		
		}
		catch (SQLException e)
		{	System.out.println ('\n' + "Erro na conexão com o banco.");
			e.printStackTrace();
			System.exit(1);
		}
				
		int dia = 15;
		int mes = 7;
		int ano = 2000;
		
		int hora = 10;
		int minuto = 30;
		int segundo = 12;
		int nanoSegundos = 0;

		SimpleDateFormat sdf1 = new SimpleDateFormat("dd/MM/yyyy");	
		SimpleDateFormat sdf2 = new SimpleDateFormat("HH:mm:ss");	
		SimpleDateFormat sdf3 = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");	
	
		Date umaData = Date.valueOf(ano + "-" + mes + "-" + dia);

		Time umaHora = Time.valueOf(hora + ":" + minuto + ":" + segundo);

		Timestamp umaDataHora = Timestamp.valueOf(ano + "-" + 
		                                          mes + "-" + 
		                                          dia + " " + 
		                                          hora + ":" + 
		                                          minuto + ":" + 
		                                          segundo + "." + 
		                                          nanoSegundos);

		System.out.println("Data: " + sdf1.format(umaData));
		System.out.println("Hora: " + sdf2.format(umaHora));
		System.out.println("Data e Hora: " + sdf3.format(umaDataHora));
		
		System.out.println("");

		try
		{	PreparedStatement pstmt = conn.prepareStatement 
				("INSERT INTO DATAS(DATA, HORA, DATA_HORA) " +
			 	"VALUES (?, ?, ?)");
			pstmt.setDate (1, umaData);
			pstmt.setTime (2, umaHora);	
			pstmt.setTimestamp (3, umaDataHora);	

			pstmt.executeUpdate();
			pstmt.close();
		}
		catch(SQLException e)
		{	System.out.println ('\n' + "Erro ao inserir os dados.");
			e.printStackTrace();
			System.exit(1);
		}
		
		try
		{	PreparedStatement pstmt = conn.prepareStatement
				("SELECT DATA, HORA, DATA_HORA FROM DATAS"); 

			ResultSet rs = pstmt.executeQuery();
			if (rs.next())
			{	umaData = rs.getDate("DATA");
			    umaHora = rs.getTime("HORA");
			    umaDataHora = rs.getTimestamp("DATA_HORA");

				System.out.println("Data: " + sdf1.format(umaData));
				System.out.println("Hora: " + sdf2.format(umaHora));
				System.out.println("Data e Hora: " + sdf3.format(umaDataHora));
	 	 	}
	 		pstmt.close();
	 		conn.close();
		}	
		catch (SQLException e)
		{	e.printStackTrace();
			System.exit(1);
		}
	}
}