How to put array into an "if" statement?

I'm making a simple game where a bunch of objects in an array appear at the same time. Pressing the mouse will remove the array of objects in a class (sample code below). When it hits 0 want it to head into another game State. I'm still so new at this...

void mousePressed() {

if (gameState == RUN_GAME) {
objects.remove(0);
}
}

When it hits 0 and theres no more objects in the sketch and you mouse press, processing automatically freezes. I've tried something like this (below) but it obviously doesn't work. How could I tell the if statement to change the gameState once the array list of objects hit 0? I hope I'm making sense.

void runGame(){

if (objects.length == 0) {
gameState == WINNER);
}
}