java的double类型如何精确到一位小数?

//分钟转小时
vacationNum = (double)Math.round(vacationNum/60*10)/10.0;
overTimeNum = (double)Math.round(overTimeNum/60*10)/10.0;

依次类推:
精确到3位小数:

overTimeNum = (double)Math.round(overTimeNum/60*1000)/1000.0;

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