java.util.UnknownFormatConversionException：
System.out.printf("%s%13s%\n", "TarrifType", "AnnualCost");
System.out.printf("%s%d.%n", "String" 243.08);
Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '
at java.util.Formatter.checkText(Unknown Source)
at java.util.Formatter.parse(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.io.PrintStream.format(Unknown Source)
at java.io.PrintStream.printf(Unknown Source)
at ModelComparison.main(ModelComparison.java:12)
知道出了什么问题吗？
System.out.printf("%s%13s%\n", "TarrifType", "AnnualCost");
System.out.printf("%s%d.%n", "String" 243.08);
Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '
at java.util.Formatter.checkText(Unknown Source)
at java.util.Formatter.parse(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.io.PrintStream.format(Unknown Source)
at java.io.PrintStream.printf(Unknown Source)
at ModelComparison.main(ModelComparison.java:12)
Any idea whats wrong?
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评论（5）
问题出在第一行的
%\n。请注意，%是格式字符串中的特殊字符，表示后面有格式说明符。%后面的\n不是有效的格式说明符。如果要打印百分号，请在格式字符串中将其加倍：
%%如果要打印换行符，则使用
%n，而不是%\n。What's wrong is the
%\nin the first line. Note that the%is a special character in a format string that indicates that a format specifier follows. The\nafter the%is not a valid format specifier.If you wanted to print a percent sign, then double it in the format string:
%%If you wanted to print a newline, then use
%n, not%\n.格式字符串中的问题是您混合了两种换行方式：
%n和\n。前者告诉格式化程序以平台需要的任何格式放置换行符，而后者仅放入文字换行符。但是你写的是%\n，这意味着你正在转义换行符，这就是爆炸的原因。您还忘记了第二次调用中“String”和 243.08 之间的逗号。顺便说一句，
%d格式化一个整数，所以如果您尝试打印 243.08，您可能不需要它。The problem in your format string is that you mixed two ways of doing newline:
%nand\n. The former tells the formatter to put a newline in whatever format the platform requires, whereas the latter puts in just a literal newline char. But what you wrote was%\n, which means you're escaping the newline char, and that's what's blowing up.You also forgot a comma between "String" and 243.08 in the second call. And btw,
%dformats an integer, so you probably don't want it if you're trying to print 243.08.错误..
http://ideone.com/USOx1
Bugs..
http://ideone.com/USOx1
就我而言（Android），
strings.xml中存在错误：当我尝试获取
getString(R.string.cashback)时，收到此异常。要修复此问题，请将%替换为%%。In my case (Android) there was an error in
strings.xml:When I tried to get
getString(R.string.cashback), I received this exception. To fix it, replace%with%%.如果需要在 Kotlin 中格式化字符串，可以使用以下代码片段。
在 string.xml 中：
在主代码中：
If a string desired to format in Kotlin, the following code snippet can be used.
In the string.xml:
In the main code: