Iterator it = list.iterator();
while(it.hasNext()){
\u3000\/\/using \u201cit.next();\u201ddo some businesss logic
}\u800c\u8fd9\u5c31\u662f\u5173\u4e8e\u8fed\u4ee3\u5668\u6a21\u5f0f\u5e94\u7528\u5f88\u597d\u7684\u4f8b\u5b50\u3002
<\/code>
\u3000\u3000\u4e8c\u3001 \u5b9a\u4e49\u4e0e\u7ed3\u6784<\/p>\n\u3000\u3000\u8fed\u4ee3\u5668\uff08Iterator\uff09\u6a21\u5f0f\uff0c\u53c8\u53eb\u505a\u6e38\u6807\uff08Cursor\uff09\u6a21\u5f0f\u3002GOF\u7ed9\u51fa\u7684\u5b9a\u4e49\u4e3a\uff1a\u63d0\u4f9b\u4e00\u79cd\u65b9\u6cd5\u8bbf\u95ee\u4e00\u4e2a\u5bb9\u5668\uff08container\uff09\u5bf9\u8c61\u4e2d\u5404\u4e2a\u5143\u7d20\uff0c\u800c\u53c8\u4e0d\u9700\u66b4\u9732\u8be5\u5bf9\u8c61\u7684\u5185\u90e8\u7ec6\u8282\u3002<\/p>\n
\u3000\u3000\u4ece\u5b9a\u4e49\u53ef\u89c1\uff0c\u8fed\u4ee3\u5668\u6a21\u5f0f\u662f\u4e3a\u5bb9\u5668\u800c\u751f\u3002\u5f88\u660e\u663e\uff0c\u5bf9\u5bb9\u5668\u5bf9\u8c61\u7684\u8bbf\u95ee\u5fc5\u7136\u6d89\u53ca\u5230\u904d\u5386\u7b97\u6cd5\u3002\u4f60\u53ef\u4ee5\u4e00\u80a1\u8111\u7684\u5c06\u904d\u5386\u65b9\u6cd5\u585e\u5230\u5bb9\u5668\u5bf9\u8c61\u4e2d\u53bb\uff1b\u6216\u8005\u6839\u672c\u4e0d\u53bb\u63d0\u4f9b\u4ec0\u4e48\u904d\u5386\u7b97\u6cd5\uff0c\u8ba9\u4f7f\u7528\u5bb9\u5668\u7684\u4eba\u81ea\u5df1\u53bb\u5b9e\u73b0\u53bb\u5427\u3002\u8fd9\u4e24\u79cd\u60c5\u51b5\u597d\u50cf\u90fd\u80fd\u591f\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n
\u3000\u3000\u7136\u800c\u5728\u524d\u4e00\u79cd\u60c5\u51b5\uff0c\u5bb9\u5668\u627f\u53d7\u4e86\u8fc7\u591a\u7684\u529f\u80fd\uff0c\u5b83\u4e0d\u4ec5\u8981\u8d1f\u8d23\u81ea\u5df1\u201c\u5bb9\u5668\u201d\u5185\u7684\u5143\u7d20\u7ef4\u62a4\uff08\u6dfb\u52a0\u3001\u5220\u9664\u7b49\u7b49\uff09\uff0c\u800c\u4e14\u8fd8\u8981\u63d0\u4f9b\u904d\u5386\u81ea\u8eab\u7684\u63a5\u53e3\uff1b\u800c\u4e14\u7531\u4e8e\u904d\u5386\u72b6\u6001\u4fdd\u5b58\u7684\u95ee\u9898\uff0c\u4e0d\u80fd\u5bf9\u540c\u4e00\u4e2a\u5bb9\u5668\u5bf9\u8c61\u540c\u65f6\u8fdb\u884c\u591a\u4e2a\u904d\u5386\u3002\u7b2c\u4e8c\u79cd\u65b9\u5f0f\u5012\u662f\u7701\u4e8b\uff0c\u5374\u53c8\u5c06\u5bb9\u5668\u7684\u5185\u90e8\u7ec6\u8282\u66b4\u9732\u65e0\u9057\u3002<\/p>\n
\u3000\u3000\u800c\u8fed\u4ee3\u5668\u6a21\u5f0f\u7684\u51fa\u73b0\uff0c\u5f88\u597d\u7684\u89e3\u51b3\u4e86\u4e0a\u9762\u4e24\u79cd\u60c5\u51b5\u7684\u5f0a\u7aef\u3002\u5148\u6765\u770b\u4e0b\u8fed\u4ee3\u5668\u6a21\u5f0f\u7684\u771f\u9762\u76ee\u5427\u3002 <\/p>\n
\u3000\u3000\u8fed\u4ee3\u5668\u6a21\u5f0f\u7531\u4ee5\u4e0b\u89d2\u8272\u7ec4\u6210\uff1a<\/p>\n
\u3000\u30001) \u8fed\u4ee3\u5668\u89d2\u8272\uff08Iterator\uff09\uff1a\u8fed\u4ee3\u5668\u89d2\u8272\u8d1f\u8d23\u5b9a\u4e49\u8bbf\u95ee\u548c\u904d\u5386\u5143\u7d20\u7684\u63a5\u53e3\u3002<\/p>\n
\u3000\u30002) \u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\uff08Concrete Iterator\uff09\uff1a\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u8981\u5b9e\u73b0\u8fed\u4ee3\u5668\u63a5\u53e3\uff0c\u5e76\u8981\u8bb0\u5f55\u904d\u5386\u4e2d\u7684\u5f53\u524d\u4f4d\u7f6e\u3002<\/p>\n
\u3000\u30003) \u5bb9\u5668\u89d2\u8272\uff08Container\uff09\uff1a\u5bb9\u5668\u89d2\u8272\u8d1f\u8d23\u63d0\u4f9b\u521b\u5efa\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u7684\u63a5\u53e3\u3002<\/p>\n
\u3000\u30004) \u5177\u4f53\u5bb9\u5668\u89d2\u8272\uff08Concrete Container\uff09\uff1a\u5177\u4f53\u5bb9\u5668\u89d2\u8272\u5b9e\u73b0\u521b\u5efa\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u7684\u63a5\u53e3\u2014\u2014\u8fd9\u4e2a\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u4e8e\u8be5\u5bb9\u5668\u7684\u7ed3\u6784\u76f8\u5173\u3002<\/p>\n
\u3000\u3000\u8fed\u4ee3\u5668\u6a21\u5f0f\u7684\u7c7b\u56fe\u5982\u4e0b\uff1a
![](\"http:\/\/www.poloo.org\/wp-content\/attachments\/month_0803\/t200838135015.jpg\")
\u3000\u3000\u4ece\u7ed3\u6784\u4e0a\u53ef\u4ee5\u770b\u51fa\uff0c\u8fed\u4ee3\u5668\u6a21\u5f0f\u5728\u5ba2\u6237\u4e0e\u5bb9\u5668\u4e4b\u95f4\u52a0\u5165\u4e86\u8fed\u4ee3\u5668\u89d2\u8272\u3002\u8fed\u4ee3\u5668\u89d2\u8272\u7684\u52a0\u5165\uff0c\u5c31\u53ef\u4ee5\u5f88\u597d\u7684\u907f\u514d\u5bb9\u5668\u5185\u90e8\u7ec6\u8282\u7684\u66b4\u9732\uff0c\u800c\u4e14\u4e5f\u4f7f\u5f97\u8bbe\u8ba1\u7b26\u53f7\u201c\u5355\u4e00\u804c\u8d23\u539f\u5219\u201d\u3002<\/p>\n
\u3000\u3000\u6ce8\u610f\uff0c\u5728\u8fed\u4ee3\u5668\u6a21\u5f0f\u4e2d\uff0c\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u548c\u5177\u4f53\u5bb9\u5668\u89d2\u8272\u662f\u8026\u5408\u5728\u4e00\u8d77\u7684\u2014\u2014\u904d\u5386\u7b97\u6cd5\u662f\u4e0e\u5bb9\u5668\u7684\u5185\u90e8\u7ec6\u8282\u7d27\u5bc6\u76f8\u5173\u7684\u3002\u4e3a\u4e86\u4f7f\u5ba2\u6237\u7a0b\u5e8f\u4ece\u4e0e\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u8026\u5408\u7684\u56f0\u5883\u4e2d\u8131\u79bb\u51fa\u6765\uff0c\u907f\u514d\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u7684\u66f4\u6362\u7ed9\u5ba2\u6237\u7a0b\u5e8f\u5e26\u6765\u7684\u4fee\u6539\uff0c\u8fed\u4ee3\u5668\u6a21\u5f0f\u62bd\u8c61\u4e86\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\uff0c\u4f7f\u5f97\u5ba2\u6237\u7a0b\u5e8f\u66f4\u5177\u4e00\u822c\u6027\u548c\u91cd\u7528\u6027\u3002\u8fd9\u88ab\u79f0\u4e3a\u591a\u6001\u8fed\u4ee3\u3002<\/p>\n
\u3000\u3000\u4e09\u3001 \u4e3e\u4f8b<\/p>\n
\u3000\u3000\u7531\u4e8e\u8fed\u4ee3\u5668\u6a21\u5f0f\u672c\u8eab\u7684\u89c4\u5b9a\u6bd4\u8f83\u677e\u6563\uff0c\u6240\u4ee5\u5177\u4f53\u5b9e\u73b0\u4e5f\u5c31\u4e94\u82b1\u516b\u95e8\u3002\u6211\u4eec\u5728\u6b64\u4ec5\u4e3e\u4e00\u4f8b\uff0c\u6839\u672c\u4e0d\u80fd\u5c06\u5b9e\u73b0\u65b9\u5f0f\u4e00\u4e00\u5448\u73b0\u3002\u56e0\u6b64\u5728\u4e3e\u4f8b\u524d\uff0c\u6211\u4eec\u5148\u6765\u5217\u4e3e\u4e0b\u8fed\u4ee3\u5668\u6a21\u5f0f\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002 <\/p>\n
\u3000\u30001\uff0e\u8fed\u4ee3\u5668\u89d2\u8272\u5b9a\u4e49\u4e86\u904d\u5386\u7684\u63a5\u53e3\uff0c\u4f46\u662f\u6ca1\u6709\u89c4\u5b9a\u7531\u8c01\u6765\u63a7\u5236\u8fed\u4ee3\u3002\u5728Java collection\u7684\u5e94\u7528\u4e2d\uff0c\u662f\u7531\u5ba2\u6237\u7a0b\u5e8f\u6765\u63a7\u5236\u904d\u5386\u7684\u8fdb\u7a0b\uff0c\u88ab\u79f0\u4e3a\u5916\u90e8\u8fed\u4ee3\u5668\uff1b\u8fd8\u6709\u4e00\u79cd\u5b9e\u73b0\u65b9\u5f0f\u4fbf\u662f\u7531\u8fed\u4ee3\u5668\u81ea\u8eab\u6765\u63a7\u5236\u8fed\u4ee3\uff0c\u88ab\u79f0\u4e3a\u5185\u90e8\u8fed\u4ee3\u5668\u3002\u5916\u90e8\u8fed\u4ee3\u5668\u8981\u6bd4\u5185\u90e8\u8fed\u4ee3\u5668\u7075\u6d3b\u3001\u5f3a\u5927\uff0c\u800c\u4e14\u5185\u90e8\u8fed\u4ee3\u5668\u5728java\u8bed\u8a00\u73af\u5883\u4e2d\uff0c\u53ef\u7528\u6027\u5f88\u5f31\u3002<\/p>\n
\u3000\u30002\uff0e\u5728\u8fed\u4ee3\u5668\u6a21\u5f0f\u4e2d\u6ca1\u6709\u89c4\u5b9a\u8c01\u6765\u5b9e\u73b0\u904d\u5386\u7b97\u6cd5\u3002\u597d\u50cf\u7406\u6240\u5f53\u7136\u7684\u8981\u5728\u8fed\u4ee3\u5668\u89d2\u8272\u4e2d\u5b9e\u73b0\u3002\u56e0\u4e3a\u65e2\u4fbf\u4e8e\u4e00\u4e2a\u5bb9\u5668\u4e0a\u4f7f\u7528\u4e0d\u540c\u7684\u904d\u5386\u7b97\u6cd5\uff0c\u4e5f\u4fbf\u4e8e\u5c06\u4e00\u79cd\u904d\u5386\u7b97\u6cd5\u5e94\u7528\u4e8e\u4e0d\u540c\u7684\u5bb9\u5668\u3002\u4f46\u662f\u8fd9\u6837\u5c31\u7834\u574f\u6389\u4e86\u5bb9\u5668\u7684\u5c01\u88c5\u2014\u2014\u5bb9\u5668\u89d2\u8272\u5c31\u8981\u516c\u5f00\u81ea\u5df1\u7684\u79c1\u6709\u5c5e\u6027\uff0c\u5728java\u4e2d\u4fbf\u610f\u5473\u7740\u5411\u5176\u4ed6\u7c7b\u516c\u5f00\u4e86\u81ea\u5df1\u7684\u79c1\u6709\u5c5e\u6027\u3002<\/p>\n
\u3000\u3000\u90a3\u6211\u4eec\u628a\u5b83\u653e\u5230\u5bb9\u5668\u89d2\u8272\u91cc\u6765\u5b9e\u73b0\u597d\u4e86\u3002\u8fd9\u6837\u8fed\u4ee3\u5668\u89d2\u8272\u5c31\u88ab\u67b6\u7a7a\u4e3a\u4ec5\u4ec5\u5b58\u653e\u4e00\u4e2a\u904d\u5386\u5f53\u524d\u4f4d\u7f6e\u7684\u529f\u80fd\u3002\u4f46\u662f\u904d\u5386\u7b97\u6cd5\u4fbf\u548c\u7279\u5b9a\u7684\u5bb9\u5668\u7d27\u7d27\u7ed1\u5728\u4e00\u8d77\u4e86\u3002<\/p>\n
\u3000\u3000\u800c\u5728Java Collection\u7684\u5e94\u7528\u4e2d\uff0c\u63d0\u4f9b\u7684\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u662f\u5b9a\u4e49\u5728\u5bb9\u5668\u89d2\u8272\u4e2d\u7684\u5185\u90e8\u7c7b\u3002\u8fd9\u6837\u4fbf\u4fdd\u62a4\u4e86\u5bb9\u5668\u7684\u5c01\u88c5\u3002\u4f46\u662f\u540c\u65f6\u5bb9\u5668\u4e5f\u63d0\u4f9b\u4e86\u904d\u5386\u7b97\u6cd5\u63a5\u53e3\uff0c\u4f60\u53ef\u4ee5\u6269\u5c55\u81ea\u5df1\u7684\u8fed\u4ee3\u5668\u3002<\/p>\n
\u3000\u3000\u597d\u4e86\uff0c\u6211\u4eec\u6765\u770b\u4e0bJava Collection\u4e2d\u7684\u8fed\u4ee3\u5668\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u5427\u3002
\/\/\u8fed\u4ee3\u5668\u89d2\u8272\uff0c\u4ec5\u4ec5\u5b9a\u4e49\u4e86\u904d\u5386\u63a5\u53e3
public interface Iterator {
\u3000boolean hasNext();
\u3000Object next();
\u3000void remove();
}
<\/code>
\/\/\u5bb9\u5668\u89d2\u8272\uff0c\u8fd9\u91cc\u4ee5List\u4e3a\u4f8b\u3002\u5b83\u4e5f\u4ec5\u4ec5\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5c31\u4e0d\u7f57\u5217\u51fa\u6765\u4e86
\/\/\u5177\u4f53\u5bb9\u5668\u89d2\u8272\uff0c\u4fbf\u662f\u5b9e\u73b0\u4e86List\u63a5\u53e3\u7684ArrayList\u7b49\u7c7b\u3002\u4e3a\u4e86\u7a81\u51fa\u91cd\u70b9\u8fd9\u91cc\u6307\u7f57\u5217\u548c\u8fed\u4ee3\u5668\u76f8\u5173\u7684\u5185\u5bb9
\/\/\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\uff0c\u5b83\u662f\u4ee5\u5185\u90e8\u7c7b\u7684\u5f62\u5f0f\u51fa\u6765\u7684\u3002AbstractList\u662f\u4e3a\u4e86\u5c06\u5404\u4e2a\u5177\u4f53\u5bb9\u5668\u89d2\u8272\u7684\u516c\u5171\u90e8\u5206\u63d0\u53d6\u51fa\u6765\u800c\u5b58\u5728\u7684\u3002
public abstract class AbstractList extends AbstractCollection implements List {
\u2026\u2026
\/\/\u8fd9\u4e2a\u4fbf\u662f\u8d1f\u8d23\u521b\u5efa\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u7684\u5de5\u5382\u65b9\u6cd5
public Iterator iterator() {
\u3000return new Itr();
}<\/p>\n\/\/\u4f5c\u4e3a\u5185\u90e8\u7c7b\u7684\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272<\/p>\n
private class Itr implements Iterator {
\u3000int cursor = 0;
\u3000int lastRet = -1;
\u3000int expectedModCount = modCount;<\/p>\n
\u3000public boolean hasNext() {
\u3000\u3000return cursor != size();
\u3000}<\/p>\n
\u3000public Object next() {
\u3000\u3000checkForComodification();
\u3000\u3000try {
\u3000\u3000\u3000Object next = get(cursor);
\u3000\u3000\u3000lastRet = cursor++;
\u3000\u3000\u3000return next;
\u3000\u3000} catch(IndexOutOfBoundsException e) {
\u3000\u3000\u3000checkForComodification();
\u3000\u3000\u3000throw new NoSuchElementException();
\u3000\u3000}
\u3000}<\/p>\n
\u3000public void remove() {
\u3000\u3000if (lastRet == -1)
\u3000\u3000\u3000throw new IllegalStateException();
\u3000\u3000\u3000checkForComodification();<\/p>\n
\u3000\u3000try {
\u3000\u3000\u3000AbstractList.this.remove(lastRet);
\u3000\u3000\u3000if (lastRet < cursor)
\u3000\u3000\u3000\u3000cursor--;
\u3000\u3000\u3000lastRet = -1;
\u3000\u3000\u3000expectedModCount = modCount;
\u3000\u3000} catch(IndexOutOfBoundsException e) {
\u3000\u3000\u3000throw new ConcurrentModificationException();
\u3000\u3000}
\u3000}<\/p>\n
\u3000final void checkForComodification() {
\u3000\u3000if (modCount != expectedModCount)
\u3000\u3000\u3000throw new ConcurrentModificationException();
\u3000}
}<\/code>
\u81f3\u4e8e\u8fed\u4ee3\u5668\u6a21\u5f0f\u7684\u4f7f\u7528\u3002\u6b63\u5982\u5f15\u8a00\u4e2d\u6240\u5217\u90a3\u6837\uff0c\u5ba2\u6237\u7a0b\u5e8f\u8981\u5148\u5f97\u5230\u5177\u4f53\u5bb9\u5668\u89d2\u8272\uff0c\u7136\u540e\u518d\u901a\u8fc7\u5177\u4f53\u5bb9\u5668\u89d2\u8272\u5f97\u5230\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u3002\u8fd9\u6837\u4fbf\u53ef\u4ee5\u4f7f\u7528\u5177\u4f53\u8fed\u4ee3\u5668\u89d2\u8272\u6765\u904d\u5386\u5bb9\u5668\u4e86\u2026\u2026<\/p>\n
\u3000\u3000\u56db\u3001 \u5b9e\u73b0\u81ea\u5df1\u7684\u8fed\u4ee3\u5668<\/p>\n
\u3000\u3000\u5728\u5b9e\u73b0\u81ea\u5df1\u7684\u8fed\u4ee3\u5668\u7684\u65f6\u5019\uff0c\u4e00\u822c\u8981\u64cd\u4f5c\u7684\u5bb9\u5668\u6709\u652f\u6301\u7684\u63a5\u53e3\u624d\u53ef\u4ee5\u3002\u800c\u4e14\u6211\u4eec\u8fd8\u8981\u6ce8\u610f\u4ee5\u4e0b\u95ee\u9898\uff1a <\/p>\n
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\u3000\u3000\u5728\u5bb9\u5668\u4e2d\u5b58\u5728\u590d\u5408\u5bf9\u8c61\u7684\u60c5\u51b5\uff0c\u8fed\u4ee3\u5668\u600e\u6837\u624d\u80fd\u652f\u6301\u6df1\u5c42\u904d\u5386\u548c\u591a\u79cd\u904d\u5386\u5462\uff1f<\/p>\n
\u3000\u3000\u4ee5\u4e0a\u4e24\u4e2a\u95ee\u9898\u5bf9\u4e8e\u4e0d\u540c\u7ed3\u6784\u7684\u5bb9\u5668\u89d2\u8272\uff0c\u5404\u4e0d\u76f8\u540c\uff0c\u503c\u5f97\u8003\u8651\u3002<\/p>\n
\u3000\u3000\u4e94\u3001 \u9002\u7528\u60c5\u51b5 <\/p>\n
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\u3000\u30001) \u652f\u6301\u4ee5\u4e0d\u540c\u7684\u65b9\u5f0f\u904d\u5386\u4e00\u4e2a\u5bb9\u5668\u89d2\u8272\u3002\u6839\u636e\u5b9e\u73b0\u65b9\u5f0f\u7684\u4e0d\u540c\uff0c\u6548\u679c\u4e0a\u4f1a\u6709\u5dee\u522b\u3002<\/p>\n
\u3000\u30002) \u7b80\u5316\u4e86\u5bb9\u5668\u7684\u63a5\u53e3\u3002\u4f46\u662f\u5728java Collection\u4e2d\u4e3a\u4e86\u63d0\u9ad8\u53ef\u6269\u5c55\u6027\uff0c\u5bb9\u5668\u8fd8\u662f\u63d0\u4f9b\u4e86\u904d\u5386\u7684\u63a5\u53e3\u3002<\/p>\n
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\u3000\u30002) \u652f\u6301\u5bf9\u5bb9\u5668\u5bf9\u8c61\u7684\u591a\u79cd\u904d\u5386\u3002<\/p>\n
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\u3000\u3000\u516d\u3001 \u603b\u7ed3<\/p>\n
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