统计字符

package exam;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class Demo {    public static void main(String[] args) throws IOException {        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));        char[] cArr = br.readLine().toCharArray();//转化为字符数组        int[] count = new int[128];        for (int i = 0; i < cArr.length; i++) {            if (('A' <= cArr[i] && cArr[i] <= 'Z')                    || (cArr[i] >= 'a' && cArr[i] <= 'z')||(cArr[i] >= '0' && cArr[i] <= '9')) {                ++count[cArr[i]];//统计个数                if(count[cArr[i]] == 3){                    System.out.println(cArr[i]);                    break;                }            }        }      }}