Java的Iterator迭代器

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迭代器能夠將遍曆的操作與序列底層的結構分離

 1 import java.util.*; 2  3 public class CrossContainerIterator { 4  5     public static void main(String[] args) { 6          7         ArrayList<Integer> arrayList = new ArrayList<Integer>(Arrays.asList(1,2,3)); 8         LinkedList<Integer> linkedList = new LinkedList<Integer>(Arrays.asList(1,2,3)); 9         HashSet<Integer> hashSet = new HashSet<Integer>();10         11         hashSet.addAll(Arrays.asList(1,1,3));12         13         display(arrayList.iterator());14         display(linkedList.iterator());15         display(hashSet.iterator());16         17     }18     public static void display(Iterator<Integer> it)19     {20         while(it.hasNext())21         {22             System.out.print(it.next());23         }24         System.out.println();25         26     }27     28 29 }

 

Java的Iterator迭代器