This is the solution to Stanford CS106A YahtzeeMagicStub checkCategory replacement method

YahtzeeCheckCategory

/* Pre-condition: The player has finished rolling the dice and selects a category. 
	 * This method returns true if the selected category matches 
	 * to the actual category correctly, and false if it does not match. */
	private boolean checkCategory(int[] dice, int category) {
		boolean categoryMatch = false;
		if(category >= ONES && category <= SIXES || category == CHANCE) {
			categoryMatch = true;
		}
		else {
			
			//creates an array for each possible dice value (1-6)
			ArrayList <Integer> ones = new ArrayList<Integer>();  
			ArrayList <Integer> twos = new ArrayList<Integer>(); 
			ArrayList <Integer> threes = new ArrayList<Integer>(); 
			ArrayList <Integer> fours = new ArrayList<Integer>(); 
			ArrayList <Integer> fives = new ArrayList<Integer>(); 
			ArrayList <Integer> sixes = new ArrayList<Integer>();
			
			/*goes through each rolled die and puts 1 as a place-holder into the appropriate ArrayList
			* e.g. if the first die value is 1, then 1 is added to the ones ArrayList or
			* if the second die value is 5, then 1 is added to the fives ArrayList*/
			for(int i = 0; i < N_DICE; i++) {
				if(dice[i] == 1) {
					ones.add(1);
				}
				else if(dice[i] == 2) {
					twos.add(1);
				}
				else if(dice[i] == 3) {
					threes.add(1);
				}
				else if(dice[i] == 4) {
					fours.add(1);
				}
				else if(dice[i] == 5) {
					fives.add(1);
				}
				else if(dice[i] == 6) {
					sixes.add(1);
				}
			}
			if(category == THREE_OF_A_KIND) {
				if(ones.size() >= 3 || twos.size() >= 3 || threes.size() >= 3 || fours.size() >= 3 || fives.size() >= 3 || sixes.size() >= 3) {
					categoryMatch = true;
				}
			}	
			else if(category == FOUR_OF_A_KIND) { 
				if(ones.size() >= 4 || twos.size() >= 4 || threes.size() >= 4 || fours.size() >= 4 || fives.size() >= 4 || sixes.size() >= 4) {
					categoryMatch = true;
				}
			}
			else if(category == YAHTZEE) {
				if(ones.size() == 5 || twos.size() == 5 || threes.size() == 5 || fours.size() == 5 || fives.size() == 5 || sixes.size() == 5) {
					categoryMatch = true;
				}
			}
			else if(category == FULL_HOUSE) {
				if(ones.size() == 3 || twos.size() == 3 || threes.size() == 3 || fours.size() == 3 || fives.size() == 3 || sixes.size() == 3) {
					if(ones.size() == 2 || twos.size() == 2 || threes.size() == 2 || fours.size() == 2 || fives.size() == 2 || sixes.size() == 2) {
						categoryMatch = true;
					}
				}
			}	
			else if(category == LARGE_STRAIGHT) { 
				if(ones.size() == 1 && twos.size() == 1 && threes.size() == 1 && fours.size() == 1 && fives.size() == 1){
					categoryMatch = true;
				}
				else if(twos.size() == 1 && threes.size() == 1 && fours.size() == 1 && fives.size() == 1 && sixes.size() == 1) {
					categoryMatch = true;
				}
			}
			else if(category == SMALL_STRAIGHT) { 
				if(ones.size() >= 1 && twos.size() >= 1 && threes.size() >= 1 && fours.size() >= 1) {
					categoryMatch = true;
				}
				else if(twos.size() >= 1 && threes.size() >= 1 && fours.size() >= 1 && fives.size() >= 1) {
					categoryMatch = true;
				}
				else if(threes.size() >= 1 && fours.size() >= 1 && fives.size() >= 1 && sixes.size() >= 1) {
					categoryMatch = true;
				}
			}
		}
		return categoryMatch;
	}