// Create a socket without a timeout
try {
    InetAddress addr = InetAddress.getByName("java.sun.com");
    int port = 80;

    // This constructor will block until the connection succeeds
    Socket socket = new Socket(addr, port);
} catch (UnknownHostException e) {
} catch (IOException e) {
}

// Create a socket with a timeout
try {
    InetAddress addr = InetAddress.getByName("java.sun.com");
    int port = 80;
    SocketAddress sockaddr = new InetSocketAddress(addr, port);

    // Create an unbound socket
    Socket sock = new Socket();

    // This method will block no more than timeoutMs.
    // If the timeout occurs, SocketTimeoutException is thrown.
    int timeoutMs = 2000;   // 2 seconds
    sock.connect(sockaddr, timeoutMs);
} catch (UnknownHostException e) {
} catch (SocketTimeoutException e) {
} catch (IOException e) {
}