create table date_test (some_date date)
insert into date_test values (to_date('2015-03-13 02:20:21', 'yyyy-mm-dd hh24:mi:ss'));
insert into date_test values (to_date('2016-03-13 02:20:21', 'yyyy-mm-dd hh24:mi:ss'));

Properties props = new Properties();
props.put("user", "*****");
props.put("password", "****");
Connection con =
DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", props);
ResultSet rs = stmt.executeQuery("select * from date_test");
    while (rs.next()) {
           System.out.println("via String: " + rs.getString(1));
           System.out.println("via Timestamp: " + rs.getTimestamp(1));
        }
        rs.close();