Groovy file check
<p>I am a java fresher and I went to an interview recently. They asked a question which was something like: Set up Groovy, test whether a sample json file is valid or not. If it is valid, run the json file. If it is not, print "File is not valid". If file is not found, print "file not found". I was given 2 hours time to do it and I could use the internet.</p>

<p>As I had no idea what groovy was or json was, I searched it and set up groovy but could not obtain the output in two hours. What should I have written? I tried some code but I am sure that it was wrong. </p>