题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
import java.util.Scanner; import java.util.HashSet; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String s = sc.nextLine(); char[] ch = s.toCharArray(); HashSet<Character> set = new HashSet<Character>(); for(int i = 0; i < ch.length; i++){ set.add(ch[i]); } System.out.println(set.size()); } }