Iterator是解决不同容器的一种设计模型，同时支持ArrayList、LinkedList、HashSet、TreeSet集合数据的迭代。

import typeinfo.pets.;

import java.util.; public class CrossContainerIteration { public static void display(Iterator<Pet> it) { while(it.hasNext()) { Pet p = it.next(); System.out.print(p.id() + ":" + p + " "); } System.out.println(); } public static void main(String[] args) { ArrayList<Pet> pets = Pets.arrayList(8); LinkedList<Pet> petsLL = new LinkedList<Pet>(pets); HashSet<Pet> petsHS = new HashSet<Pet>(pets); TreeSet<Pet> petsTS = new TreeSet<Pet>(pets); display(pets.iterator()); display(petsLL.iterator()); display(petsHS.iterator()); display(petsTS.iterator()); } } /* 输出 0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug 7:Manx 0:Rat 1:Manx 2:Cymric 3:Mutt 4:Pug 5:Cymric 6:Pug 7:Manx 4:Pug 6:Pug 3:Mutt 1:Manx 5:Cymric 7:Manx 2:Cymric 0:Rat 5:Cymric 2:Cymric 7:Manx 1:Manx 3:Mutt 6:Pug 4:Pug 0:Rat

还可以与for循环联合使用

List<String> all = new ArrayList<String>(Arrays.asList(insarray));

all.addAll(alist); Iterator<String> it = all.iterator(); for(int i=0;i<alist.size();i++){ String outstr = it.next(); it.remove(); System.out.print(outstr); }