StringBuilder sb = new StringBuilder();
// Send all output to the Appendable object sb
Formatter formatter = new Formatter(sb, Locale.US);
// Explicit argument indices may be used to re-order output.
formatter.format("%4s %3s %2s %1s", "a", "b", "c", "d")
// -> " d c b a"
StringBuilder sb = new StringBuilder();
// Se
阅读背景：
理解Java格式字符串中的$
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