失误的笔试题--SplitString

class SplitString{

     static void SplitString(String str, int len){
       char temp;
       String results = "";
       //字节数;
       int count = 0;
       //汉字数;
       int han = 0;
       int i =0;
    while(len > count){
              temp =str.charAt(i);
      if(Character.getNumericValue(temp)!=-1){
          //返回temp体表的字符的Unicode值;
          System.out.print("Unicode-values==>"Character.getNumericValue(temp));
           // 遇到字母的时候
                results = results + temp;
                count++;
                i++;
      }else{
// 遇到汉字的时候，作为unicode字符，汉字的整数值是-1
           results = results + temp;
           count = count +2;
           i++;
           han = han +1;
       }

    }
     if(len < count){
      if(len==1){
  ////当第一个是汉字时,且len=1;走此方法;表示不能读取一个汉字;
           results="";
        }else{
         //最终结果出来了!!!!!!!!!!!!
          results = results.substring(0,count - (han +1));
         }
     }
          System.out.print("results==>"+results);
}

public static void main(String args[]){
  String str = "add终dfdffd天daa弄出af来你dafadfdas了";
int len = 4;
SplitString(str, 4);

}

}