Connection connection = null;
try {
    // Load the JDBC driver
    String driverName = "oracle.jdbc.driver.OracleDriver";
    Class.forName(driverName);

    // Create a connection to the database
    String serverName = "127.0.0.1";
    String portNumber = "1521";
    String sid = "mydatabase";
    String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid;
    String username = "username";
    String password = "password";
    connection = DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
    // Could not find the database driver
} catch (SQLException e) {
    // Could not connect to the database
}