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This is a confusing way to compare locations:
(stillObject.getX() - 100) + playerObject.getX()) < -200)
what is the code supposed to be doing?

In general its better to use variables. There might be a time when they will be changed.
Using a named variable also makes the code more understandable.

You will have to know which way is...

The way I debug these kinds of problems is by taking a piece of paper and drawing the shapes all the different ways that there can be a collision and then looking at the x,y & width,height of both...