How should I read from a buffered reader?
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by Roman
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Published on 2010-03-23T13:15:29Z
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2010/03/23
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I have the following example of reading from a buffered reader:
while ((inputLine = input.readLine()) != null) {
System.out.println("I got a message from a client: " + inputLine);
}
The code in the loop println
will be executed whenever something appears in the buffered reader (input
in this case). In my case, if a client-application writes something to the socket, the code in the loop (in the server-application) will be executed.
But I do not understand how it works. inputLine = input.readLine()
waits until something appears in the buffered reader and when something appears there it returns true
and the code in the loop is executed. But when null
can be returned.
There is another question. The above code was taken from a method which throws Exception
and I use this code in the run method of the Thread. And when I try to put throws Exception
before the run
the compiler complains: overridden method does not throw exception. Without the throws exception
I have another complain from the compiler: unreported exception. So, what can I do?
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