Java 获取随机数生成器种子的当前日期时间

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时间:2020-08-14 01:38:41  来源:igfitidea点击:

Getting Current Date Time for a Random Number Generator's Seed

javatimelong-integerscalar

提问by bobber205

Preferably as a long.

最好是长的。

All the example I can find are getting the date/time as a string and not any scalar value. :)

我能找到的所有示例都是将日期/时间作为字符串而不是任何标量值。:)

采纳答案by Greg Hewgill

If you reallywant the current time as a long, try System.currentTimeMillis(). Alternatively, you can use new Date().getTime().

如果您真的希望当前时间很长,请尝试System.currentTimeMillis(). 或者,您可以使用new Date().getTime().

However, using the current time as a random number generator seed is a very poor choice (at least, if you are using the random numbers for anything important, such as cryptography). You may wish to consider using a random source such as /dev/urandom(if available on your platform).

但是,使用当前时间作为随机数生成器种子是一个非常糟糕的选择(至少,如果您将随机数用于任何重要的事情,例如密码学)。您可能希望考虑使用随机源,例如/dev/urandom(如果在您的平台上可用)。

回答by Peter Tillemans

System.currentTimeMillis returns a long.

System.currentTimeMillis 返回一个 long。

http://download.oracle.com/javase/1.5.0/docs/api/java/lang/System.html#currentTimeMillis()

http://download.oracle.com/javase/1.5.0/docs/api/java/lang/System.html#currentTimeMillis()

there is also System.nanoTime().

还有 System.nanoTime()。

回答by sujeetgandhi

To generate a random number you can use this code:

要生成随机数,您可以使用以下代码:

var randomnumber=new Date().getUTCMilliseconds();
var rand = Math.floor((Math.random() * randomnumber) + 1); 
document.write(rand);