java - 如何将字符添加到特定索引中的字符串？

Question

我有一个由 6 个字母组成的字符串，例如:“abcdef”。我需要添加“。”每两个字符，所以它会是这样的:“ab.cd.ef”。我在 java 工作，我试过这个:

private String FormatAddress(String sourceAddress) {
    char[] sourceAddressFormatted = new char[8];
    sourceAddress.getChars(0, 1, sourceAddressFormatted, 0);
    sourceAddress += ".";
    sourceAddress.getChars(2, 3, sourceAddressFormatted, 3);
    sourceAddress += ".";
    sourceAddress.getChars(4, 5, sourceAddressFormatted, 6);
    String s = new String(sourceAddressFormatted);
    return s;
}

但我收到了奇怪的值，例如 [C@2723b6.

提前致谢:)

Answer 1

尝试正则表达式:

输入:

abcdef

代码:

System.out.println("abcdef".replaceAll(".{2}(?!$)", "$0."));

输出:

ab.cd.ef