java - 用java替换String中的最后一个字符

Question

我有一个字符串：

String fieldName = "A=2,B=3 and C=3,";

现在我想,用空格替换最后一个。

我用过：

if (fieldName.endsWith(",")) {
    fieldName.replace(",", " ");
    fieldName = fieldName.replace((char) (fieldName.length() - 1), 'r');
}

System.out.println("fieldName = " + fieldName);

但我仍然得到相同的旧字符串。我怎样才能得到这个输出呢？

fieldName = A=2,B=3 and C=3

score 67 · Accepted Answer

您可以简单地使用substring：

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

确保在执行后重新分配您的字段，substring因为字符串在 java 中是不可变的

score 14 · Accepted Answer

我想用空格替换最后一个'，'

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

如果要删除尾随逗号，只需去掉+ " ".

score 12 · Accepted Answer

要获得所需的结果，您可以执行以下操作：

fieldName = fieldName.trim();
fieldName = fieldName.substring(0,fieldName.length() - 1);

score 11 · Accepted Answer

11

fieldName = fieldName.substring(0, string.length()-1) + " ";

于 2013-03-07T10:20:04.940 回答

score 8 · Accepted Answer

首先字符串在java中是不可变的，你必须将替换的结果分配给一个变量。

fieldName = fieldName.replace("watever","");

您也可以使用 regex 作为选项，使用String#replaceAll(regex, str);

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

score 6 · Accepted Answer

6

尝试这个：

s = s.replaceAll("[,]$", "");

于 2015-04-21T08:27:39.127 回答

score 3 · Accepted Answer

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

score 2 · Accepted Answer

org.apache.commons.lang3.StringUtils.removeEnd()和org.springframework.util.StringUtils.trimTrailingCharacter()是你的朋友：

StringUtils.removeEnd(null, *)      = null
StringUtils.removeEnd("", *)        = ""
StringUtils.removeEnd(*, null)      = *
StringUtils.removeEnd("www.domain.com", ".com.")  = "www.domain.com"
StringUtils.removeEnd("www.domain.com", ".com")   = "www.domain"
StringUtils.removeEnd("www.domain.com", "domain") = "www.domain.com"
StringUtils.removeEnd("abc", "")    = "abc"

    @Test
    public void springStringUtils() {
        String url = "https://some.site/path/";

        String result = org.springframework.util.StringUtils.trimTrailingCharacter(url, '/');

        assertThat(result, equalTo("https://some.site/path"));
    }

score 2 · Accepted Answer

StringBuilder replace 方法可用于替换最后一个字符。

StringBuilder.replace(startPosition, endPosition, newString)

StringBuilder builder = new StringBuilder(fieldName);
builder.replace(builder.length()-1, builder.length(), "");
builder.toString();

score 1 · Accepted Answer

您可以使用正则表达式来识别最后一个逗号 (,) 并将其替换为“”，如下所示：

if(fieldName.endsWith(","))
{                           
fieldName = fieldName.replace(/,([^,]*)$/," ");
}

score 1 · Accepted Answer

您可以简单地使用：

if(fieldName.endsWith(","))
{
   StringUtils.chop(fieldName);
}

来自 commons-lang

score 0 · Accepted Answer

@Abubakkar Rangara 已经回答了解决问题的简单方法

替代方案是：

String[] result = null;
if(fieldName.endsWith(",")) {                           
String[] result = fieldName.split(",");
    for(int i = 1; i < result.length - 1; i++) {
        result[0] = result[0].concat(result[i]);
    }
}

score -5 · Accepted Answer

-5

修改代码为 fieldName = fieldName.replace("," , " ");

于 2013-03-07T10:27:55.207 回答

java - 用java替换String中的最后一个字符

13 回答 13

Related

Reference