if判断取余

可以说详细点吗，我还是不懂诶

public static void main(String[] args) {
int i = 30567809;
int l = String.valueOf(i).length();
int j = 10;
String s = "";
String[] str = new String[] {"","十","百","千","万","十万","百万","千万","亿"};
for (int k = 0; k < l; k++) {
String chnum = "";
int leftnum = i % j;
switch (leftnum) {
case 0:
chnum = "零";
break;
case 1:
chnum = "一";
break;
case 2:
chnum = "二";
break;
case 3:
chnum = "三";
break;
case 4:
chnum = "四";
break;
case 5:
chnum = "五";
break;
case 6:
chnum = "六";
break;
case 7:
chnum = "七";
break;
case 8:
chnum = "八";
break;
case 9:
chnum = "九";
break;
case 10:
chnum = "十";
break;
default:
break;
}
s = chnum.equals("零")?chnum+s:chnum+str[k]+s;
i = (i-leftnum)/j;
}
System.out.println(s);
}

晚上给你写一个吧，现在没空

static String[] units = {"","十","百","千","万","十万","百万","千万","亿","十亿","百亿","千亿","万亿" };
static char[] numArray = {'零','一','二','三','四','五','六','七','八','九'};
//将整数转换成汉字数字
public static String formatInteger(int num) {
char[] val = String.valueOf(num).toCharArray();
int len = val.length;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
String m = val[i] + "";
int n = Integer.valueOf(m);
boolean isZero = n == 0;
String unit = units[(len - 1) - i];
if (isZero) {
if ('0' == val[i - 1]) {
continue;
} else {
sb.append(numArray[n]);
}
} else {
sb.append(numArray[n]);
sb.append(unit);
}
}
return sb.toString();
}
//将小数转换成汉字数字
public static String formatDecimal(double decimal) {
String decimals = String.valueOf(decimal);
int decIndex = decimals.indexOf(".");
int integ = Integer.valueOf(decimals.substring(0, decIndex));
int dec = Integer.valueOf(decimals.substring(decIndex + 1));
String result = formatInteger(integ) + "." + formatFractionalPart(dec);
return result;
}
//格式化小数部分的数字
public static String formatFractionalPart(int decimal) {
char[] val = String.valueOf(decimal).toCharArray();
int len = val.length;
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
int n = Integer.valueOf(val[i] + "");
sb.append(numArray[n]);
}
return sb.toString();
}

谢谢啦

拿去当工具用吧