java - 如何在Java Formatter中转义减号？

Question

这是格式化的表头示例:

StringBuilder sb = new StringBuilder();
Formatter formatter = new Formatter(sb, Locale.US);
formatter.format("%-16s ---%-21s--- %-21s %-23s %-25s", "IP", "BLOCKED", "BLOCKED TILL", "ACTIVITY (00:00-24:00)", "COUNTRY");
System.out.println(sb.toString());

但问题出在---%-21s---部分:

IP               ---BLOCKED              --- BLOCKED TILL          ACTIVITY (00:00-24:00)  COUNTRY

如何转义最后三个减号？我想强调排序列。结果应该是这样的:

IP               ---BLOCKED---               BLOCKED TILL          ACTIVITY (00:00-24:00)  COUNTRY

Answer 1

问题是您指定了 BLOCKED 字符串的宽度为 21，因此破折号 --- 无法立即包围文本(请注意第二组破折号位于一堆空格之后)。相反，您必须将破折号放在要打印的字符串内:

formatter.format("%-16s %-21s %-21s %-23s %-25s", "IP", "---BLOCKED---", "BLOCKED TILL", "ACTIVITY (00:00-24:00)", "COUNTRY");