CompSciRocks

public int numWordsOfLength( int len ) {
    int cnt = 0;
    for (Object w: myList) {
        String s = (String)w; 
        if (s.length() == len) {
            cnt++;
        }
    }
    return cnt; 
    

CompSciRocks

public class Cat extends Pet {
  public Cat(String name) {
    super(name);
  }
  public String speak() {
    return "meow";
  }
}

CompSciRocks

public class Robot {
  private int[] hall;
  private int pos; 
  private boolean facingRight;
  
  public boolean forwardMoveBlocked() { // part A }
  private void move() { // part B }
  public int clearHall() { // part C }
  private boolean hallIsClear() {
    // implementation not shown

CompSciRocks

public class GrayImage {
  public static final int BLACK = 0;
  public static final int WHITE = 255;
  private int[][] pixelValues;
  public int countWhitePixels() {
    // Part A
  }
  public void processImage() {
    // Part B
  }

CompSciRocks

public class CodeWordChecker implements StringChecker {
  private int min;
  private int max;
  private String no;
  
  public CodeWordChecker(int mi, int ma, String n) {
    min = mi;
    max = ma;
    no = n;
  }

CompSciRocks

public WordPairList(String[] words) {
  allPairs = new ArrayList<>();
  for (int i=0; i<words.length; i++)
    for (x=i+1; x<words.length; x++) 
      allPairs.add(new WordPair(words[i], words[x]);
}

CompSciRocks

public double runSimulation(int num) {
  int good = 0;
  for (int i=0; i<num; i++)
    if (simulate())
      good++;
  return (double)good / num;
}

CompSciRocks

public static int[] getColumn(int[][] arr2D, int c) {
  int[] out = new int[arr2D.length];
  for (int r=0; r<arr2D.length; r++)
      out[r] = arr2D[r][c];
  return out; 
}