能不能帮我分析下 下面这个题目啊
/** (3)
* 将money格式化成逗点加小数点形式
* 如:formatMoney("123456")将返回"123,456.00"
* formatMoney("1234567.10")将返回"1,234,567.10"
* 当输入为不合法的数字时抛出异常
*/
public String formatMoney(String money) throw Exception;
/** (3)
* 将money格式化成逗点加小数点形式
* 如:formatMoney("123456")将返回"123,456.00"
* formatMoney("1234567.10")将返回"1,234,567.10"
* 当输入为不合法的数字时抛出异常
*/
public String formatMoney(String money) throw Exception;
{
try{
Interger.pase(money);
}catch(Exception e)
{
throw IlleageArguException();
}DicimalFormater formater = new Dicimalformater("###,###,###.00");return formater.format(money);
}
Double num;
try {
num =Double.parseDouble(money);
} catch (Exception e) {
throw new IllegalArgumentException("please input a number");
} DecimalFormat formater = new DecimalFormat("###,###.00"); return formater.format(num);
} public static void main(String[] args) {
Testtt tt = new Testtt();
try {
System.out.println(tt.formatMoney("123456"));
System.out.println(tt.formatMoney("1234567.10"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
同意2楼的做法。
public static void formatMoney(String money) {
if (!money.matches("(?!(\\.|[0]{2,}))[\\d\\.]*(?<!\\.)")){
System.out.println("Invalid Number");
return;
}
int integralNumber = money.indexOf('.');
int newCharLength = (integralNumber - 1) / 3 + money.length(); char[] c = new char[newCharLength]; for (int i = integralNumber % 3; i < integralNumber; i += 3) {
if (i != 0) {
c[i++] = ',';
}
} int count = 0;
for (int i = 0; i < newCharLength; i++) {
if (c[i] != ',') {
c[i] = money.charAt(count++);
}
}
System.out.println("The answer is: ");
System.out.println(c);
}
String str = "1234567";
System.out.println(formatMoney(str));
str = "1234567.10";
System.out.println(formatMoney(str));
}
public static String formatMoney(String money) {
if(!money.matches("\\d+(\\.\\d{1,2})?")) {
throw new IllegalArgumentException("money format error!");
}
int pointIndex = money.indexOf(".");
if(pointIndex < 0) {
money = money + ".00";
}
if(pointIndex == money.length() - 2) {
money = money + "0";
}
money = money.replaceAll("(?<=\\d)(?=(?:\\d\\d\\d)+\\.)", ",");
return money;
}
}
同意2楼的做法。
可以不要的吧?