quiz_sb.java

StringBuilder book = new StringBuilder("This represents contents of the book.");
final Function<StringBuilder, IntSupplier> wordCounter = aString ->
  () -> aString.toString().split("\\s+").length;
final IntSupplier curry = wordCounter.apply(book);

int countBeforeChange = curry.getAsInt();
book.setLength(0);
book.append("Book contents has been changed as of now.");
int countAfterChange = curry.getAsInt();

System.out.print(
  countBeforeChange == countAfterChange ? 1 : 0
);