消除 String java 中的一个字符

Question

我怎样才能消除这个 String 中的最后一个 ,| :

String model ="07:40,09:00,10:20,11:40,|09:00,10:20,11:40,|07:40,09:00,10:20,11:40,|10:20,11:40,|";

模型是可变的 String，结果应该是这样的：

String result="07:40,09:00,10:20,11:40,|09:00,10:20,11:40,|07:40,09:00,10:20,11:40,|10:20,11:40";

Answer 1

   String model ="07:40,09:00,10:20,11:40,|09:00,10:20,11:40,|07:40,09:00,10:20,11:40,|10:20,11:40,|";
   String result = model.substring(0, model.length() -2);
   System.out.println(result);

javadoc : substring(int beginIndex, int endIndex) : Returns a new string that is a substring of this string.

Answer 2

如果总是出现这种情况，您可以切断字符串的末尾。为此，您可以使用此代码：

result = model.substring(0, path.length() - 2);

如果只是偶尔发生，您可以这样做：

if (model.substring(path.length - 2, path.length).equals(",|")) {
    result = model.substring(0, path.length() - 2);
} else {
    result = model
}

Answer 3

如果它总是 ,| 而您不知道它是否会出现，请使用 replaceFirst:

model = model.replaceFirst(",\|$", "");

P.S。 $代表字符串结束

Answer 4

试试 StringUtils:

import org.apache.commons.lang3.StringUtils;

// model = "07:40,09:00,10:20,11:40,|09:00,10:20,11:40,|07:40,09:00,10:20,11:40,|10:20,11:40,|"
model = StringUtils.removeEnd(model, ",|");
// Now 
// model = "07:40,09:00,10:20,11:40,|09:00,10:20,11:40,|07:40,09:00,10:20,11:40,|10:20,11:40";

Answer 5

String correctedModel=new StringBuilder(model).deleteCharAt(model.lastIndexOf('|')).toString();

查看文档StringBuilder.deleteChartAt() and String.lastIndexOf()

消除 String java 中的一个字符

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