Question

I’ve written a class which extends Socket class – with the intention of retaining all the methods from a regular socket, while adding two methods of my own:

public class ClientSocket extends Socket{

private long lastOnline;

public ClientSocket() {
      super();
}

public long getLastOnline() {
    return lastOnline;
}

public void setLastOnline(long lastOnline) {
    this.lastOnline = lastOnline;
}

When I’m trying to initialize a new instance of this class, and to add an open socket to it, I’m doing something wrong (or maybe something is wrong with me ), and it tells me that I cannot set a socket to ClientSocket object (although it extends Socket):

ClientSocket socket = serverSocket.accept();

How can I resolve this? Thanks!

Answer 1

serverSocket.accept() returns an ordinary Socket, not a ClientSocket.
A ClientSocket is a Socket, but not vice-versa.