Ptt 大爆卦 | Java DecimalFormat - 前往 https://stackoverflow.com/questions/53089357/in-the-java-class-decimalformat-what-do-the-hashtags-at-the-left-side-of-the-de

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In the Java class DecimalFormat, what do the hashtags at the ...

Like others have said # formats a digit but drops zeros. In your example where you apply .### to a double like 12.34 it would format to ...

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