What is the difference between OCI and THIN driver connection with data source connection between java and oracle XE?

Question

I'm writing the below codes for connection between the java and Oracle 10g XE using 3 way(OCI, THIN and data source), the code is running successfully but don't know difference between the THIN and OCI with data source connection.

1-

public static void main (String args[]) throws SQLException
 {
  OracleDataSource ods = new OracleDataSource();
  ods.setURL("jdbc:oracle:thin:hr/hr@localhost:1521/XE");
  Connection con = ods.getConnection();
  System.out.println("Connected");
  con.close();
 }

2-

public static void main(String args[])
     {
      try
      {
       // load oracle driver
      Class.forName("oracle.jdbc.driver.OracleDriver");
      // connect using Thin driver
      Connection con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","hr","hr");
      System.out.println("Connected Successfully To Oracle");
      con.close();
      }
      catch(Exception ex)
      {
        ex.printStackTrace();
      }
 }

3-

public static void main(String args[])
     {
      try
      {
       // load oracle driver
      Class.forName("oracle.jdbc.driver.OracleDriver");
      // connect using Native-API (OCI) driver
      Connection con = DriverManager.getConnection("jdbc:oracle:oci:@","hr","hr" );
      System.out.println("Connected Successfully To Oracle using OCI driver");
      con.close();
      }
      catch(Exception ex)
      {
        ex.printStackTrace();
      }
 }

Answer 1

Oracle provides four types of drivers for their database, but I'll only enumerate the two you asked about.

The OCI driver is a type 2 JDBC driver and uses native code to connect to the database. Thus, it is only an option on platforms that have native Oracle drivers available and it is not a "pure" Java implementation.

Oracle's JDBC Thin driver is a type 4 JDBC Driver that uses Java sockets to connect directly to Oracle. It implements Oracle's SQL*Net TCP/IP protocol directly. Because it is 100% Java, it is platform independent and can also run from an Applet. (not that you should)