how does isReachable work

i write a piece of code

Socket theSock = new Socket();

try {

byte[] addr = { 127, 0, 0, 1 };

InetAddress addr1 = InetAddress.getByAddress(addr);

//part1

System.out.print(addr1.isReachable(1000));

SocketAddress sockaddr = new InetSocketAddress(addr1, 7);

//part2

theSock.connect(sockaddr, 1000);

} catch (Exception e) {

e.printStackTrace();

} finally {

if (theSock != null) {

try {

theSock.close();

} catch (IOException e) {

}

}

the result is quite intresting, in part 1 Reachable told me "true" but

in part 2 thrown out an Exception "java.net.ConnectException: Connection refused: connect.." . is there any guy could tell me how could that happen. any reponse will be appreciate

leon_wa at 2007-7-12 16:52:40 >