题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
import java.util.*; // 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 in = new Scanner(System.in); try{ String str = in.next(); byte result = 0; char[] ch = str.toCharArray(); Set set = new HashSet<>(); for(char c : ch){ set.add(c); } System.out.print(set.size()); }catch(InputMismatchException e){ System.out.print("你输入有误!"); }finally{ if(in != null){ in.close(); } } } }