Question

如果字符串以逗号

结尾，我想删除逗号

例如

String names =“A，B，C，”

如果字符串以“，”

结尾，我需要删除最后一个逗号

Answer 1

您可以尝试使用正则表达式：

names = names.replaceAll(",$", "");

或简单的子字符串：

if (names.endsWith(",")) {
  names = names.substring(0, names.length() - 1);
}

Answer 2

if (names.endsWith(",")) {
    names = names.substring(0, names.length()-1);
}

Answer 3

int last = names.length() - 1;
if (last > 0 && names.charAt(last) == ',') {
    names = names.substring(0, last);
}

Answer 4

如果你不想重新发明轮子：

StringUtils.stripEnd(names, ",");

Answer 5

StringBuilder stringBuilder = new StringBuilder();

for (...) {
    ....
}

int lastSeparator = stringBuilder.lastIndexOf("\n");

if (lastSeparator != -1) {
    stringBuilder.delete(lastSeparator, lastSeparator + 2);
}

Answer 6

您可以使用＆＃39; Java 8＆＃39;

执行此类操作

private static void appendNamesWithComma() {
    List<String> namesList = Arrays.asList("test1", "tester2", "testers3", "t4");
    System.out.println(namesList.stream()
                                .collect(Collectors.joining(", ")));

}

如果字符串在结尾处有逗号，如何删除逗号

6 个答案: