/* Return true if the string "cat" and "dog" appear the same number of times * in the given string. */ public boolean catDog(String str) { int cat = 0; int dog = 0; for(int i = 0; i < str.length() - 2; i++) { if(str.substring(i, i + 3).equals("cat")) cat++; if(str.substring(i, i + 3).equals("dog")) dog++; } return cat == dog; }