Fastest way to scan ports with Java

I made a very simple port scanner, but it runs too slow, so I'm looking for a way to make it scan faster. Here is my code:

public boolean portIsOpen(String ip, int port, int timeout) {
    try {
        Socket socket = new Socket();
        socket.connect(new InetSocketAddress(ip, port), timeout);
        socket.close();
        return true;
    } catch (Exception ex) {
        return false;
    }
}

This code tests if a specific port is open on a specific IP address. For timeout I used a minimum value of 200 because when I go lower it doesn't have enough time to test the port.

It works well, but it takes too much time to scan from 0 to 65535. Is there another way that could maybe scan from 0 to 65535 in less than 5 minutes?