小写数字转换成大写数字

大概想了一下，给你个思路吧（这个只是个思路，具体的各种异常处理和可能涉及的更复杂的判断你就得自己写了）

 
public static void main(String[] args) {
        String[] numbers = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};
        String[] units = {"", "拾", "佰", "仟", "万", "拾万", "佰万", "仟万", "亿"};
 
        String moneyLower = "987";
        StringBuffer moneyUpper = new StringBuffer();
        for(int i = 0; i < moneyLower.length(); i ++) {
            int unitIndex = 0 - (i + 1 - moneyLower.length()); // '9' 的index为 2
            int numberIndex = Integer.parseInt( moneyLower.charAt(i) + "" );
 
            String numberString = numbers[numberIndex];
            String unitString = units[unitIndex];
 
            moneyUpper.append(numberString)
                    .append(unitString);
        }
        System.out.print(moneyUpper);
    }
 

再解释一下，基本的思路就是

数字 = 字(number) * 单位(unit)

数字字符串 = 字字符串(numberString) + 单位字符串(unitString)

987 = 9 100 + 8 10 + 7

"玖佰捌拾柒" = ("玖" + "佰") + ("捌" + "拾") + ("柒" + "")

大概就这么个思路