How do i compile all java classes from multiple packages/directories with a single javac command?

Question: Often when we have java classes in a package/sub-package structure, we would like to compile all of them with a single javac command. We expect that because of dependencies between java classes across packages all code would get compile automatically, if we simply try to compile the main class or package. But this does not happen (from command-line javac).

Solution:
Put all the path to all java code you want to compile one after another with a space between them.

For eg: to compile classes in package com.abc and com.abc.def, we do this:
javac com/abc/*.java com/abc/def/*.java -d output

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