还是正则表达式帅，我这个写的非常丑陋 public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNext()) { String str = in.nextLine(); str = str.toLowerCase(); String engCh = "abcdefghijklmnopqrstuvwxyz"; String figCh = "0123456789"; String space = " "; int countEng = 0; int countFig = 0; int countSpace = 0; int elseCh = 0; for (int i = 0; i < str.length(); i++) { if (engCh.contains(Character.toString(str.charAt(i)))) { countEng++; } else if (figCh.contains(Character.toString(str.charAt(i)))) { countFig++; } else if (space.contains(Character.toString(str.charAt(i)))) { countSpace++; } else { elseCh++; } } System.out.println(countEng); System.out.println(countSpace); System.out.println(countFig); System.out.println(elseCh); } }