java - HJ10 字符个数统计
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
// 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);
String inputLine = in.nextLine();
int inputLen = inputLine.length();
Set<Character> set = new HashSet<Character>();
for(int i=0; i<inputLen; i++){
set.add(inputLine.charAt(i));
}
System.out.print(set.size());
}
}