java - Using a common buffer to read from inputstream and to write to outputstream -

i read network socket's input stream buffer

count = input.read(buffer) 

then in next line, i'm printing read contents using

str = new string(buffer,0,count); log.e("str",str); 

then try write pipedoutputstream of pipedinputstream

pipedoutputstream .write(buffer); 

where,

pipedoutputstream = new pipedoutputstream(pipedinputstream) 

the problem thread blocking @ pipedoutputstream .write(buffer);

below confirm that, taken thread debugging tool of ddms,

  @ java.lang.object.wait(native method)      @ java.lang.object.wait(object.java:401)    @ java.io.pipedinputstream.receive(pipedinputstream.java:394)       @ java.io.pipedoutputstream.write(pipedoutputstream.java:176)       @ java.io.outputstream.write(outputstream.java:106)     @ java.io.pipedoutputstream.write(pipedoutputstream.java:147)       @ java.io.outputstream.write(outputstream.java:82)      @ com.example.receiver.run(drcreceiver.java:104) 

can 1 tell me, why following not working(blocking thread) (grouping statements)

count = input.read(buffer) str = new string(buffer,0,count); log.e("str",str); pipedoutputstream .write(buffer);    

but following working(not blocking thread) .

count = input.read(buffer) str = new string(buffer,0,count); log.e("str",str); pipedoutputstream .write(str.getbytes());    

thanks in advance

have javadoc. here can see: "attempting use both objects single thread not recommended". need thread attempts read data.