深入容器List

?

一种Generator解决方案：

所有Collection子类型都有一个接受另一个Collection对象的构造器，

用所接受的Collection对象中的元素来填充新的容器。为了更加容易

地创建测试数据，我们需要做的是构建接受Generator和quantity

数值并将他们作为构造器参数的类。

?

?

?

public class CollectionData<T> extends ArrayList<T>{public CollecitonData(Generator<T> gen, int quantity){for(int i=0; i<quantity; i++)add(gen.next());p}public static <T> CollectionData<T> list(Generator<T> gen, int quantity){return new CollectionData<T>(gen, quantity);}}class Government implemetns Generator<String>{Stirng[] foundation = ("Stringe women lying in ponds"+"distributing swords is no basis for a system of"+"government").split(" ");private int index;public String next(){return foundation[index++];}}public class CollectionDataTest{public static void main(String[] args){Set<String> set  =new LinkedHashSet<String>(new CollectionData<String>(new Government(),15));set.addAll(CollectionData.list(new Governmetn(), 15));System.out.println(set);}}