Java developers

You've been able to can auto-close a closable thing for ages now.

try(Reader r = new FileReader(/*blah*/)){
   r.whatever();
}
// r is automatically closed

But today I found that it works for something you already opened!

Reader r = new FileReader(/*blah*/);
try(r){
   r.whatever();
}
// r is automatically closed

This came up because I had a list of files and I wanted to close each one after handling it. So I couldn't create it in the header of the try block.