如何在数字字符串中插入逗号以分隔零？

Question

public class test
{
    public static void main(String[] args)
    {
        String abra = "100000";
        abra = abra.replace(abra.substring(abra.length() - 3),
               "," + abra.substring(abra.length() - 3));
        System.out.println(abra);
     }
}

完全是 java 的新手，我正在尝试用逗号替换数字以将零分隔为三个。它适用于成千上万的人，但我得到了更多的奇怪结果。有任何想法吗？

提前致谢！

Answer 1

因为你手动输入的只是6位数字。更好的方法是使用 NumberFormat#getNumberInstance with Locale.US:

A Locale object represents a specific geographical, political, or cultural region. An operation that requires a Locale to perform its task is called locale-sensitive and uses the Locale to tailor information for the user. For example, displaying a number is a locale-sensitive operation— the number should be formatted according to the customs and conventions of the user's native country, region, or culture.

NumberFormat.getNumberInstance(Locale.US).format(20000000);
// 20,000,000

如何在数字字符串中插入逗号以分隔零？

How can I insert commas in number strings to separate the zeros?

java

string

number-formatting