快手笔试

//统计字符串的个数
import java.util.Scanner;
import java.util.ArrayList;

public class Main{
    
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        String string = in.nextLine();
        ArrayList<Character> list = new ArrayList<>();
        char[] chars = string.toCharArray();//将字符串转化成字符数组
        for (int i = 0; i < chars.length; i++) {
            char aChar = chars[i];
            list.add(aChar);//将字符数组元素添加到集合中
        }
	 for  ( int  i  =   0 ; i  <  list.size()  -   1 ; i ++ )  {       
      for  ( int  j  =  list.size()  -   1 ; j  >  i; j -- )  {       
           if  (list.get(j).equals(list.get(i)))  {       
              list.remove(j);       
            }        
        }        
      } 
        for (int i = 0; i < list.size(); i++) {//遍历集合取出每个字符
            int count = 0;//定义计数器
            Character character = list.get(i);
            for (int j = 0; j < chars.length; j++) {//遍历数组取出每个字符和集合中的元素比较
                char aChar = chars[j];
                if (character.equals(aChar)){//如果集合中的元素有等于数组中的字符,计数器加1
                    count++;
                }
            }
            if(i==list.size()-1)
                System.out.println(character + ":" + count );//打印结果
            else
                System.out.println(character + ":" + count + ",");//打印结果
        }
        
    }
}