从列表中查找最近的日期 [英] Find nearest date from a list

问题描述

我有一个日期列表和当前日期。

I have a list of dates and a current date.

如何找到最接近当前日期的日期？

How can I find the date which is nearest to the current date?

推荐答案

我使用 Collection.min ，带有自定义比较器根据与当前时间的距离订购日期。

I'd use Collection.min with a custom comparator that "orders" the dates according to distance from current time.

final long now = System.currentTimeMillis();

// Create a sample list of dates
List<Date> dates = new ArrayList<Date>();
Random r = new Random();
for (int i = 0; i < 10; i++)
    dates.add(new Date(now + r.nextInt(10000)-5000));

// Get date closest to "now"
Date closest = Collections.min(dates, new Comparator<Date>() {
    public int compare(Date d1, Date d2) {
        long diff1 = Math.abs(d1.getTime() - now);
        long diff2 = Math.abs(d2.getTime() - now);
        return Long.compare(diff1, diff2);
    }
});

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