java String.format() 抛出 FormatFlagsConversionMismatchException
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String.format() throws FormatFlagsConversionMismatchException
提问by user170008
This code works fine in Java 1.6:
这段代码在 Java 1.6 中运行良好：
public static String padLeft(String s, int n)
{
if (n <= 0)
return s;
int noOfSpaces = n * 2;
String output;
noOfSpaces = s.length() + noOfSpaces;
output = String.format("%1$#" + noOfSpaces + "s", s);
return output;
}
But newer versions (and some other VM implementations) throw this Exception:
但是较新的版本（以及其他一些 VM 实现）抛出了这个Exception：
java.util.FormatFlagsConversionMismatchException: Mismatched Convertor =s, Flags= #
at java.util.Formatter$Transformer.transformFromString(Formatter.java:1020)
at java.util.Formatter$Transformer.transform(Formatter.java:861)
at java.util.Formatter.format(Formatter.java:565)
at java.util.Formatter.format(Formatter.java:509)
at java.lang.String.format(String.java:1961)
Any workarounds?
任何解决方法？
采纳答案by Jere K?pyaho
You asked for a workaround; just use StringBuilder:
您要求解决方法；只需使用StringBuilder：
public static String padLeft(String s, int n) {
if (n <= 0)
return s;
int noOfSpaces = n * 2;
StringBuilder output = new StringBuilder(s.length() + noOfSpaces);
while (noOfSpaces > 0) {
output.append(" ");
noOfSpaces--;
}
output.append(s);
return output.toString();
}
回答by barti_ddu
Since you are using #flag in format string, you should pass Formattableas an argument (doc).
由于您#在格式字符串中使用标志，因此您应该将Formattable作为参数 ( doc)传递。
Any work arounds?
任何解决方法？
Don't use #in format string?
不要#在格式字符串中使用？
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