The constructor:
    public DatagramSocket(int port, InetAddress laddr) throws SocketException {
        this(new InetSocketAddress(laddr, port));
    }

relies on `InetSocketAddress(laddr, port)` whose specification states "A null address will assign the wildcard address". A similar assertion should be added to the specification of `DatagramSocket(int port, InetAddress laddr)` to clarify what occurs when a null address is passed as a parameter. This is also true for `MulticastSocket(SocketAddress bindaddr)`.

The constructor:
    public DatagramSocket(int port) throws SocketException {
        this(port, null);
    }

mentions "The socket will be bound to the wildcard address, an IP address chosen by the kernel". This is ambiguous and requires clarification.