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When I use Socket socket = new Socket(InetAddress.getLocalHost().getHostAddress(), 16249); in Client to construct the socket,I can successfully get the “hello, client” sent by the server to me, as well as the number of characters 12.
But when I use Socket socket = new Socket(InetAddress.getLocalHost(), 16249); to construct the socket.The server program can successfully obtain the data sent from the client, but the client falls into a loop at while(i==0)

I want to know the difference between the two construction methods

I also want to know what caused the other construction method to fail to enable the client to receive the data sent from the server