public static void main(String[] args) {

		StringBuilder sb = new StringBuilder(10);
		System.out.println(sb.length()); // #=> 0
		sb.append("123456", 1, 3);
		sb.append("a");
		sb.setCharAt(0, 'c');
		sb.insert(1, "d");
		System.out.println(sb);  // #=> cd3a
		sb.replace(0, 2, "ab");
		sb.delete(0, 1);
		sb.deleteCharAt(0);
		
		List<String> list = new ArrayList<>();
		list.add("a");
		list.add("a");
		list.add("a");
		list.set(0, "b");
		list.add(1, "b");
		System.out.println(list);  // #=> [b, b, a, a]
		list.remove(0);
		list.remove("b");
		list.removeIf(s -> s.length() > 2);
		System.out.println(list);  // #=> [a, a]
		list.removeAll(Arrays.asList("a", "b"));
		list.size();
	}

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