java数字转汉字

package test;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class ShuZiZhuanHanZi {

   public static void main(String[] args) {

      String jg = "";
      
      Scanner input = new Scanner(System.in);
      System.out.print("请输入要转换的数字：");
      int i = input.nextInt();
      String d = "";
      String n = String.valueOf(i);
      StringBuffer sb = new StringBuffer(n);
      n = sb.reverse().toString(); // 将字符串倒叙
      Map<Integer, String> map = new HashMap<Integer, String>( );
      for (int j = 0; j < n.length(); j++) {
         d = String.valueOf(n.charAt(j)); // 对map集合赋值
         map.put(j, d);
      }
      for (Integer in : map.keySet()) { // 遍历map集合
         String str = map.get(in);
         /*System.out.println(in + "     " + str);*/
         switch(str){
         case "1":str="一";break;
         case "2":str="二";break;
         case "3":str="三";break;
         case "4":str="四";break;
         case "5":str="五";break;
         case "6":str="六";break;
         case "7":str="七";break;
         case "8":str="八";break;
         case "9":str="九";break;
         case "0":str="零";break;
         }
          switch (in) { 
          case 0: jg+= str; break;
          case 1: jg+= "十"+str; break;
          case 2: jg+= "百"+str;break;
          case 3: jg+= "千"+str;break;
          case 4: jg+= "万"+str;break;
          case 5: jg+= "十"+str;break;
          case 6: jg+= "百"+str;break;
          case 7: jg+= "千"+str;break;
          case 8: jg+= "亿"+str;break;
          }       
      }
      StringBuffer sbi = new StringBuffer(jg);
      jg = sbi.reverse().toString();    
      if("一十".equals(jg.substring(0, 2))){
         jg = jg.substring(1);
         if("零".equals(jg.substring(jg.length()-1,jg.length()))){
            jg = jg.substring(0,jg.length()-1);
            System.out.println(jg);
         }else{
            System.out.println(jg);
         }
      }
      if("零".equals(jg.substring(jg.length()-1,jg.length()))){
         jg = jg.substring(0,jg.length()-1);
         System.out.println(jg);
         }
      else{
         System.out.println(jg);
      }
   }
}