exercise-answers.md

Exercise Answers

Week 11

1. One possible answer is shown below.

   public class Eagle extends Critter {
   	private int multiplier;
   	private int colorCount;
   	private boolean isRed;
   
   	public Eagle() {
   		multiplier = 1;
   		colorCount = 0;
   		isRed = true;
   	}
   
   	public Action getMove(CritterInfo info) {
   		colorCount++;
   		if (colorCount == multiplier) {
   			colorCount = 0;
   			if (!isRed) {
   				multiplier++;
   			} 
   			isRed = !isRed;
   		}
   
   		if (info.getFront() == Neighbor.EMPTY) {
   			return Action.HOP;
   		} else if (info.getFront() == Neighbor.WALL) {
   			return Action.RIGHT;
   		} else {
   			return Action.INFECT;
   		}            
   	}
   
   	public Color getColor() {
   		if (isRed) {
   			return Color.RED;
   		} else {
   			return Color.BLUE;
   		}
   	}      
   
   	public String toString() {
   		return "<>";
   	}
   }

2. One possible answer is shown below.

   public static void manyStrings(ArrayList<String> list, int n) {
   	for (int i = 0; i < list.size(); i+=n) {
   		String word = list.get(i);
   		for (int j = 1; j < n; j++) {
   			list.add(i + j, word);
   		}   
   	}
   }

3. One possible answer is shown below.

   public static boolean allPlural(String[] list) {      
   	for (int i = 0; i < list.length; i++) {
   		if (!list[i].toLowerCase().endsWith("s")) {
   			return false;
   		}
   	}
   	return true;      
   }