public static String digitUppercase(double n){

String fraction[] = {"角", "分"};

String digit[] = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };

String unit[][] = {{"元", "万", "亿"},

{"", "拾", "佰", "仟"}};

String head = n < 0? "负": "";

n = Math.abs(n);

String s = "";

for (int i = 0; i < fraction.length; i++) {

s += (digit[(int)(Math.floor(n * 10 * Math.pow(10, i)) % 10)] + fraction[i]).replaceAll("(零.)+", "");

}

if(s.length()<1){

s = "整";

}

int integerPart = (int)Math.floor(n);

for (int i = 0; i < unit[0].length && integerPart > 0; i++) {

String p ="";

for (int j = 0; j < unit[1].length && n > 0; j++) {

p = digit[integerPart%10]+unit[1][j] + p;

integerPart = integerPart/10;

}

s = p.replaceAll("(零.)*零$", "").replaceAll("^$", "零") + unit[0][i] + s;

}

return head + s.replaceAll("(零.)*零元", "元").replaceFirst("(零.)+", "").replaceAll("(零.)+", "零").replaceAll("^整$", "零元整");

}

原文：http://www.cnblogs.com/qingfengliaoren/p/4636178.html