import java.util.Scanner;
import java.io.PrintStream;
import java.net.URL;
import java.io.IOException;
import javax.swing.JOptionPane;

/**
 * Displays an information message with the current temperature in Toronto.
 *
 * @author Franck van Breugel
 */
public class Temperature
{
    public static void main(String[] args) throws IOException
    {
	Scanner input = new Scanner(System.in);
	PrintStream output = System.out;
	
	// create a Scanner to read from the URL of the weather network
	URL url = new URL("http://www.theweathernetwork.com/weather/caon0696");
	Scanner urlInput = new Scanner(url.openStream());
			
	final String BEGIN = "<p>";
	final String END = "</p>";
	final String PATTERN = BEGIN + "-?\\d{1,2}" + END;

	// read the web page line by line
	while (urlInput.hasNextLine())
	{
	    String line = urlInput.nextLine().trim();
	    // if the line matches the pattern
	    if (line.matches(PATTERN))
	    {
		// extract the temperature
		int temperature = Integer.parseInt(line.substring(BEGIN.length(), line.length() - END.length()));
		// display an information message with the temperature
		JOptionPane.showMessageDialog(null, "" + temperature + " C", "Current temperature in Toronto", JOptionPane.INFORMATION_MESSAGE);	
	    }
	}
	
	// close the Scanner		
	urlInput.close();
    }
}