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interface expected here
I am getting this error:

for the following code:

I know this usually means that I'm missing a bracket or have an extra one somewhere but I just can't seem to find it and my code won't compile. I know I'm missing something simple here - anyone see something I'm missing?
NVM - I figured it out. I wasn't missing anything, I just needed to extend PriorityQueue instead of implement it because apparently when you implement it expects an interface.
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