如何生成随机的五位数Java [英] How to generate a random five digit number Java
问题描述
可能重复:
Java:生成范围内的随机数
我需要一些帮助。
我会使用什么代码创建一个长度为5位且以1或2开头的随机数?
What code would I use to create a random number that is 5 digits long and starts with either 1 or 2?
以公司员工身份用作身份。
in order to use as a company employees ID.
谢谢!!
推荐答案
取决于你如何解决这个问题:
Depending on how you approach the problem something like that:
public int gen() {
Random r = new Random( System.currentTimeMillis() );
return 10000 + r.nextInt(20000);
}
或类似的东西(你可能想要随机的瞬间该方法的对象,但为了简单起见,我只是把它放在这里):
Or something like that (you probably want the instantation of the Random object of of the method but I just put it here for simplicity) :
public int gen() {
Random r = new Random( System.currentTimeMillis() );
return ((1 + r.nextInt(2)) * 10000 + r.nextInt(10000));
}
想法是 1 + nextInt(2)应始终给出1或2.然后将它乘以10000以满足您的要求,然后在[0..9999]之间添加一个数字。
The idea is that 1 + nextInt(2) shall always give 1 or 2. You then multiply it by 10000 to satisfy your requirement and then add a number between [0..9999].
这是一些例子输出:
14499
12713
14192
13381
14501
24695
18802
25942
21558
26100
29350
23976
29045
16170
23200
23098
20465
23284
16035
18628
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