ALT // Get alphabetics only x.chars().allMatch(Character::isAlphabetic)

ALT // Clean original string from symbols // StripComments.stripComments("a #b\nc\nd $e f g", new String[]{"#", "$"}) public static String stripComments(final String text, final String[] symbols) { return Arrays.stream(text.split("\n")) .map(line -> line.replaceAll("[" String.join("", symbols) "].*", "").stripTrailing()) .collect(Collectors.joining("\n")); }

ALT // Find unique number return Arrays.stream(a).boxed() .collect(groupingBy(identity(), counting())) .entrySet().stream() .filter(e -> e.getValue() == 1) .findFirst() .map(Entry::getKey) .orElse(0.0);

ALT // Find unique number Arrays.sort(a); return a[0] == a[1] ? a[arr.length-1]:a[0];

ALT // Remove List B from List A for (int i = 0; i < b.length; i ) a = ArrayUtils.removeAllOccurences(a, b[i]); return a;

ALT // Remove List B from List A List<Integer> listA = Arrays.stream(a).boxed().collect(Collectors.toList()); List<Integer> listB = Arrays.stream(b).boxed().collect(Collectors.toList()); listA.removeAll(listB); return listA.stream().mapToInt(e -> e).toArray();

ALT // Remove List B from List A IntStream.of(a) .filter(x -> IntStream.of(b).noneMatch(y -> y == x)) .toArray();

ALT http://culturepopped.blogspot.com/2011/06/hal-9000-foolproof-and-incapable-of.html