import java.sql.*;

public class JDBCHelloWorld {
    public static void main(String args) throws Exception {
	Connection conn = null;
	try {
	    // register Oracle JDBC driver with DriverManager
	    Class.forName("oracle.jdbc.driver.OracleDriver");

	    // get a connection to the database
	    conn = DriverManager.getConnection(
			"jdbc:oracle:thin:@localhost:1521:XE", 
			"scott", 
			"tiger");

	    // construct a Statement
	    Statement stmt = conn.createStatement();

	    // run query
	    ResultSet rs = stmt.executeQuery("SELECT 'Hello World' FROM DUAL;");

	    // iterate through the result set
	    while (rs.next()) {
		System.out.println(rs.getString(1));
	    }
	}
	finally {  // always close JDBC connection in a finally block!
	    if (conn != null) conn.close();
	}
    }
}