Java 阿拉伯數字轉國字

最大顯示到拾億，也就是10位阿拉伯數字

import java.util.Scanner;

public class Chinese {
    static String [] chineseNumber = {"零","壹","貳","參","肆","伍","陸","柒","捌","玖"};
    static String [] chineseUnit = {"","拾","佰","仟","萬","拾萬","佰萬","仟萬","億","拾億"};
    static StringBuffer str;
    static Long money;
    static String input;
    static int index;
    static boolean naZero;
    static Scanner sc = new Scanner(System.in);
     
    public static void main(String args[]){
        while( sc.hasNext() ){
            str = new StringBuffer();
            money = sc.nextLong();
            input = money.toString();
            index = input.length();
            naZero = false;

            for( char a : input.toCharArray() ){
                index--;

                if( a > '0' ){
                    if( naZero ){
                        str.append(chineseNumber[0]);
                        naZero = false;
                    }
                    str.append(chineseNumber[(int)(a-'0')]+chineseUnit[index]);
                }
                else{
                    naZero = true;
                }
    
                String b = chineseUnit[index <= 7 ? 4 : 8];
                    int c = str.indexOf(b);
                    int d = str.lastIndexOf(b);
                    if( c == d ){
                        continue;
                    }
                    else{
                        str.deleteCharAt(c);
                    }
                }
   
                if( str.length() == 0 ){
                    str.append(chineseNumber[0]);
                }
   
                System.out.println(str);
        }
    }
}