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问题描述
如何使用groovy从名称列表中获取随机元素?
我可以使用groovy的collections属性以简单的方式创建一个包含10个人的随机名称列表吗?
Groovy是管理集合的强大工具.我有一个像这样的清单:
Groovy is extremely powerful managing collections. I have a list like this one:
def nameList = ["Jon", "Mike", "Alexia"]我想做的是迭代10次,从第一个列表中获得10个名字随机的人.
What I am trying to do is iterating 10 times to get ten people with a random name from the first list.
10.times{ Person person = new Person( name: nameList.get() //I WANT TO GET A RANDOM NAME FROM THE LIST ) }由于两个明显的原因,此方法不起作用,我没有在nameList.get中添加任何索引,也没有创建10个不同的Person对象.
This is not working for two obvious reasons, I am not adding any index in my nameList.get and I am not creating 10 different Person objects.
推荐答案
只需使用Java方法Collections.shuffle()之类的
Just use the Java method Collections.shuffle() like
class Person { def name } def nameList = ["Jon", "Mike", "Alexia"] 10.times { Collections.shuffle nameList Person person = new Person( name: nameList.first() ) println person.name }或使用类似的随机索引
class Person { def name } def nameList = ["Jon", "Mike", "Alexia"] def nameListSize = nameList.size() def r = new Random() 10.times { Person person = new Person( name: nameList.get(r.nextInt(nameListSize)) ) println person.name }更多推荐
从列表中获取随机元素的Groovy方法
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