I can't get the output of javac or java

I want to redirect the output of compilation into a text file
just like,
javac Sample.java > err.txt
Please give me a solution

I assume you're using some kind of unix.
Error messages are sent to stderr, so using the ">" character won't work (it will only redirect the stdout messages). To direct ALL messages to a file, use ">&".
For example,
javac Sample.java >& err.txt
Hope that helps.
- Matt

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