【Exceptions】java String.format报错 java.util.UnknownFormatConversionException

问题

用String.format时，想让返回的内容有‘%’。测试时会报错：java.util.UnknownFormatConversionException: Conversion = ‘’’
比如

String str = String.format("%s%","100");
System.out.printf(str);

解决

‘%’是特殊字符，想单独输出要转义。前面再加个’%'即可。如：

String str = String.format("%s%%","100");
System.out.printf(str);

参考

https://www.cnblogs.com/zhangliang88/p/10621167.html
https://blog.youkuaiyun.com/wl724120268/article/details/103043503
https://www.jianshu.com/p/bdc8633d7fbc