java - Why InputStream.read() returns -1? -

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my android smartphone tcpclient , chipkit wf32 wifi module tcp server. 

int bytesread; inputstream inputstream = socket.getinputstream();  while ((bytesread = inputstream.read(buffer)) != -1){        bytearrayoutputstream.write(buffer, 0, bytesread);        response += bytearrayoutputstream.tostring("utf-8");      }

the above code reads data stream , copies buffer. if no data coming block. getting -1. can explains reason getting -1? in document mentioned "end of stream reached". can explain meaning of that? thank you.

if can read documentation see -1 signifies end of stream:
inputstream.read()

so it's natural -1.


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