random for a series of random numbers?

random for a series of random numbers??????
Using   Math.random   works   well   when   you   need   to   generate   a   single   random   number.   If   you   need   to   generate   a   series   of   random   numbers,   you   should   create   an   instance   of   java.util.Random   and   invoke   methods   on   that   object   to   generate   numbers.　  

我想让大家帮忙给俺个这样的例子，用java.util.Random中的哪些方法就可以产生一系列的随机数呢？？？

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nextBytes(byte[] bytes)
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Random r = new Random ();
r.nextDouble(),r.nextFloat(),r.nextInt()...
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blog 更新:
think in java 各章后练习答案.....
http://blog.csdn.net/heimaoxiaozi/