字符串按照收个字符排序

String数组和List集合排序

字符串数组

String[] tokenizer = {"abcd","bacd","bbcd","cadb","cbda","caaa","1234","2134","2231","2131"};

首个字符排序

正序

List<String> collect = Arrays.stream(tokenizer).sorted(Comparator.comparing(item -> item.toUpperCase().toCharArray()[0])).collect(Collectors.toList());

倒序

List<String> collect = Arrays.stream(tokenizer).sorted(Comparator.comparing(item -> item.toLowerCase().toCharArray()[0])).collect(Collectors.toList());

全字符排序

数组

List<String> collect = Arrays.stream(tokenizer).sorted(Comparator.naturalOrder()).collect(Collectors.toList());
Arrays.sort(tokenizer);

集合

Collections.sort(collect);