JDBC connection

    import java.sql.*;
    class OracleCon{
    public static void main(String args[]){
    try{
    //step1 load the driver class
    Class.forName("oracle.jdbc.driver.OracleDriver");

    //step2 create  the connection object
    Connection con=DriverManager.getConnection(
    "jdbc:oracle:thin:@localhost:1521:xe","system","oracle");

    //step3 create the statement object
    Statement stmt=con.createStatement();

    //step4 execute query
    ResultSet rs=stmt.executeQuery("select * from emp");
    while(rs.next())
    System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));

    //step5 close the connection object
    con.close();

    }catch(Exception e){ System.out.println(e);}

    }
    }