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This problem caused me an headache when I tried to solve it.
Which methods are available for me??

http://acm.uva.es/problemset/java.html :
"The current support for Java platform is provided by a standard gcj 2.95 installation"

Then, if you want to see compatibility, download:
http://public ...

> I noticed one thing that the output should follow the input
> immediately...rather than fetching all input , processing and then
> outputting results.

Many times, I fetched all input, did the processing and wrote the output at end, without problems.

Which methods are available for me??

http://acm.uva.es/problemset/java.html :
"The current support for Java platform is provided by a standard gcj 2.95 installation"

Then, if you want to see compatibility, download:
http://public.planetmirror.com/pub/sourceware/java/libgcj-2.95.tar.gz

And ...