关于Java：什么是UTIL种子util.Random

What is seed in util.Random?

我不明白seed在java.util.random中的含义是什么？我读过为什么这个代码印着"你好，世界"？问题是，我仍然对种子感到困惑。有人能亲切地描述一下Seed是什么意思吗？谢谢。

在setseed()方法的文档中…seed - the initial seed是什么意思？

public void setSeed(long seed)
Sets the seed of this random number generator using a single long seed. The general contract of setSeed is that it alters the state of this random number generator object so as to be in exactly the same state as if it had just been created with the argument seed as a seed. The method setSeed is implemented by class Random by atomically updating the seed to
(seed ^ 0x5DEECE66DL) & ((1L << 48) - 1) and clearing the haveNextNextGaussian flag used by nextGaussian(). The implementation of setSeed by class Random happens to use only 48 bits of the given seed. In general, however, an overriding method may use all 64 bits of the long argument as a seed value. Parameters: seed - the initial seed

如果我能准确理解seed的意思，我相信我会清楚地理解这个答案。

A pseudo-random number generator produces a sequence of numbers. It
isn't truly random, but generally a mathematical calculation which
produces an output that matches some desirable distribution, and
without obvious patterns. In order to produce such a sequence, there
must be state stored for the generator to be able to generate the next
number in that sequence. The state is updated each time using some
part of the output from the previous step.

Seeding explicitly initialises this state. A 'seed' is a starting
point, from which something grows. In this case, a sequence of
numbers.

This can be used either to always generate the same sequence (by using
a known constant seed), which is useful for having deterministic
behaviour. This is good for debugging, for some network applications,
cryptography, etc.

Or, in situations where you want the behaviour to be unpredictable
(always different each time you run a program, a card game perhaps),
you can seed with a number likely to be continually changing, such as
time.

The 'randomness' of the sequence does not depend on the seed chosen,
though it does depend on not reseeding the sequence.

从一个种子与随机数生成算法的关系中得出，为什么用计算机时间来创建这个种子的频率更高？

这应该能回答你的问题。