集合与数组之间有可以直接相互转换的方法:
1、集合转数组
List<T> arrayList = new ArrayList<T>();T[] t = (T[]) arrayList.toArray(typeof(T));
2、数组转集合
T[] t = new T[size];List<T> l = Arrays.asList(t);
实例
public class Myclass {public static void main(Stringll args){List<string> a = new ArrayList<string>()a.add(\"a\");a.add(\"b\");a.add(\"c\");int size =a.size;string[] array =(String[])a.toArray(new String[size]);System.out.println(array[0]);List<string> list = Arrays.asList(array);System.out.println(list.get(0));}}