proxy problem

[purijatin]

hello!When in the below code if iam using a local address instead of yahoo.com,it is executing well,but if iam not using a local address then it is giving a java.net.SocketException.I use a proxy connection and i have set my proxy for java .pl help

import java.net.*;
import java.io.*;
import java.io.*;
public class URLReader {
    public static void main(String[] args) throws Exception {
	URL yahoo = new URL("http://www.yahoo.com/");
	BufferedReader in = new BufferedReader(
				new InputStreamReader(
				yahoo.openStream()));
	String inputLine;
	while ((inputLine = in.readLine()) != null)
	    System.out.println(inputLine);
	in.close();
    }
}