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Is it possible to compile and run a java file in bash without saving the compiled file? I'm using the command javac File.java && java File. It works but it creates a File.class file.

Can I somehow pipe the compiled file to the java command? I have tried javac File.java | java but it does not work.

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  • Could you explain the use case for this approach? Commented Nov 5, 2016 at 20:45
  • @StefanFreitag Thanks for your comment. The reason why I wanted to do this is that I don't want to have useless files in my file system and I thought there would be an easier way than deleting it everytime. Commented Nov 5, 2016 at 21:04
  • You can compile java code within a running JVM then load the compiled class and run it. see: quora.com/… Commented Nov 6, 2016 at 10:17

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To my knowledge, this is not possible, and it also doesn't make much sense.

You see, your JVM comes with many megabytes of precompiled classes; and many of them will be loaded while running your small class. There is no point in saving the 1 K or whatever your File.class consumes on disk space.

So you should step back and re-think what kind of problem you think you can solve by such an approach.

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javac File.java && java File ; rm File.class
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this. although like above I gotta ask "Why?" Would you compile /bin/bash every time you needed to start a shell process?

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