Division of numbers

I could see in Timesta开发者_运维技巧mp class, the constructor goes like:

    public Timestamp(long time) {
    super((time/1000)*1000);
    ....................

What Im not understanding is, what is the need of dividing the time by 1000 and then multiplying again by 1000. What difference will it make? Isn't this piece redundant?

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That's a way of truncating to the next lower multiple of 1000 milliseconds -- i.e., to the whole second. It's not necessarily the best way, but it's a way.