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Editorial Team
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Asked: 2026-06-12T02:36:43+00:00

The Java Socket class has two methods isClosed and isConnected to check whether the

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The Java Socket class has two methods isClosed and isConnected to check whether the socket is closed or connected respectively. I wanted to know what’s the difference between a TCP socket which is only open and a TCP socket which is open and connected, and how is this different from UDP.

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  1. Editorial Team

    To put things simply, a Socket that is open is a socket that is either waiting for connection or has successfully connected with another Socket. When a socket has been closed, it means that this socket is no longer available for connection, and that it’s resources has already been released. A Socket that is connected, well, it means that the socket is connected to another Socket.

    So a Socket can..

    • be open and connected at the same time.
    • be open and not connected at the same time.
    • not be connected when closed.

    UPDATE

    from @Bryan

    Apparently, there are half-closed or half-open states for TCP Sockets; which usage (today) is different from its original meaning. More on this link.

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