CODEWITHSUNDEEP
javawhile-looplogicconditional-statementsunreachable-code
dzenesiz
dzenesiz

Reputation: 1562

Reaching code after loop java

I have a chunk of code from a simple chat application, but that is not the important part of this question. It is the part of code which, as it seems to me, should be unreachable:

while (!end) {
            outputToServer.println(consoleInput.readLine());
        }

        communicationSocket.close();

    } catch (Exception e) {
        // TODO: handle exception
    }
}

@Override
public void run() { // receiving message from other clients

    String serverTextLine;

    try {
        while ((serverTextLine = inputFromServer.readLine()) != null) {
            System.out.println(serverTextLine);

            if (serverTextLine.indexOf("*** Goodbye") == 0) {
                end = true;
                return;
            }
        }

    } catch (Exception e) {

    }

}

What I don't understand is how will a program ever reach a part of code in which it sets "end" variable to true, when the while loop which uses it as a condition is before it... I suppose it is some basic java stuff that I don't remember, or something I persistently overlook :) Help, please?

Upvotes: 1

Views: 106

Answers (1)

Blue_Alien
Blue_Alien

Reputation: 2177

as the code says the control will reach the line

end = true;

when the condition 

serverTextLine.indexOf("*** Goodbye") == 0

returns true!,

that is the method indexOf(String) returns : the index of substring within the string if existing, and return -1 if not found!

The case to get "0" as index is only when the string starts with the substring. ie, when serverTextLine starts with "*** Goodbye".

Upvotes: 1

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