oops~ it blocks when i call external program in java >_<
why?
go to the jdk Runtime doc:
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the created subprocess does not have its own terminal or console.
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Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock.
here it is!!! the external need somewhere to output something, or it will block.
so, two ways to fix it.
1. grab the output/error stream in your program.
2. call external program through cmd, using cmd /c start ...
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