{"id":13,"date":"2023-05-19T20:16:50","date_gmt":"2023-05-19T12:16:50","guid":{"rendered":"http:\/\/www.greatfar.cn\/?p=13"},"modified":"2023-05-19T20:16:50","modified_gmt":"2023-05-19T12:16:50","slug":"java-iterator%ef%bc%88%e8%bf%ad%e4%bb%a3%e5%99%a8%ef%bc%89%e9%81%8d%e5%8e%86collection%e9%9b%86%e5%90%88%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/www.greatfar.cn\/archives\/13","title":{"rendered":"Java Iterator\uff08\u8fed\u4ee3\u5668\uff09\u904d\u5386Collection\u96c6\u5408\u5143\u7d20"},"content":{"rendered":"\n<p>Iterator\uff08\u8fed\u4ee3\u5668\uff09\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u7684\u4f5c\u7528\u5c31\u662f\u904d\u5386\u5bb9\u5668\u7684\u6240\u6709\u5143\u7d20\uff0c\u4e5f\u662f&nbsp;<a href=\"http:\/\/c.biancheng.net\/java\/\">Java<\/a>&nbsp;\u96c6\u5408\u6846\u67b6\u7684\u6210\u5458\uff0c\u4f46\u5b83\u4e0e Collection \u548c Map \u7cfb\u5217\u7684\u96c6\u5408\u4e0d\u4e00\u6837\uff0cCollection \u548c Map \u7cfb\u5217\u96c6\u5408\u4e3b\u8981\u7528\u4e8e\u76db\u88c5\u5176\u4ed6\u5bf9\u8c61\uff0c\u800c Iterator \u5219\u4e3b\u8981\u7528\u4e8e\u904d\u5386\uff08\u5373\u8fed\u4ee3\u8bbf\u95ee\uff09Collection \u96c6\u5408\u4e2d\u7684\u5143\u7d20\u3002<\/p>\n\n\n\n<p>Iterator \u63a5\u53e3\u9690\u85cf\u4e86\u5404\u79cd Collection \u5b9e\u73b0\u7c7b\u7684\u5e95\u5c42\u7ec6\u8282\uff0c\u5411\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u4e86\u904d\u5386 Collection \u96c6\u5408\u5143\u7d20\u7684\u7edf\u4e00\u7f16\u7a0b\u63a5\u53e3\u3002Iterator \u63a5\u53e3\u91cc\u5b9a\u4e49\u4e86\u5982\u4e0b 4 \u4e2a\u65b9\u6cd5\u3002<\/p>\n\n\n\n<ul>\n<li>boolean hasNext()\uff1a\u5982\u679c\u88ab\u8fed\u4ee3\u7684\u96c6\u5408\u5143\u7d20\u8fd8\u6ca1\u6709\u88ab\u904d\u5386\u5b8c\uff0c\u5219\u8fd4\u56de true\u3002<\/li>\n\n\n\n<li>Object next()\uff1a\u8fd4\u56de\u96c6\u5408\u91cc\u7684\u4e0b\u4e00\u4e2a\u5143\u7d20\u3002<\/li>\n\n\n\n<li>void remove()\uff1a\u5220\u9664\u96c6\u5408\u91cc\u4e0a\u4e00\u6b21 next \u65b9\u6cd5\u8fd4\u56de\u7684\u5143\u7d20\u3002<\/li>\n\n\n\n<li>void forEachRemaining(Consumer action)\uff1a\u8fd9\u662f Java 8 \u4e3a Iterator \u65b0\u589e\u7684\u9ed8\u8ba4\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u53ef\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u6765\u904d\u5386\u96c6\u5408\u5143\u7d20\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4e0b\u9762\u7a0b\u5e8f\u793a\u8303\u4e86\u901a\u8fc7 Iterator \u63a5\u53e3\u6765\u904d\u5386\u96c6\u5408\u5143\u7d20\u3002<\/p>\n\n\n\n<p>import java.util.Collection; import java.util.HashSet; import java.util.Iterator; public class IteratorTest { public static void main(String[] args) { \/\/ \u521b\u5efa\u4e00\u4e2a\u96c6\u5408 Collection objs = new HashSet(); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51Java\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b&#8221;); \/\/ \u8c03\u7528forEach()\u65b9\u6cd5\u904d\u5386\u96c6\u5408 \/\/ \u83b7\u53d6books\u96c6\u5408\u5bf9\u5e94\u7684\u8fed\u4ee3\u5668 Iterator it = objs.iterator(); while (it.hasNext()) { \/\/ it.next()\u65b9\u6cd5\u8fd4\u56de\u7684\u6570\u636e\u7c7b\u578b\u662fObject\u7c7b\u578b\uff0c\u56e0\u6b64\u9700\u8981\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362 String obj = (String) it.next(); System.out.println(obj); if (obj.equals(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b&#8221;)) { \/\/ \u4ece\u96c6\u5408\u4e2d\u5220\u9664\u4e0a\u4e00\u6b21next()\u65b9\u6cd5\u8fd4\u56de\u7684\u5143\u7d20 it.remove(); } \/\/ \u5bf9book\u53d8\u91cf\u8d4b\u503c\uff0c\u4e0d\u4f1a\u6539\u53d8\u96c6\u5408\u5143\u7d20\u672c\u8eab obj = &#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51Python\u8bed\u8a00\u6559\u7a0b&#8221;; } System.out.println(objs); } }<\/p>\n\n\n\n<p>\u4ece\u4e0a\u9762\u4ee3\u7801\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0cIterator \u4ec5\u7528\u4e8e\u904d\u5386\u96c6\u5408\uff0c\u5982\u679c\u9700\u8981\u521b\u5efa Iterator \u5bf9\u8c61\uff0c\u5219\u5fc5\u987b\u6709\u4e00\u4e2a\u88ab\u8fed\u4ee3\u7684\u96c6\u5408\u3002\u6ca1\u6709\u96c6\u5408\u7684 Iterator \u6ca1\u6709\u5b58\u5728\u7684\u4ef7\u503c\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\uff1aIterator \u5fc5\u987b\u4f9d\u9644\u4e8e Collection \u5bf9\u8c61\uff0c\u82e5\u6709\u4e00\u4e2a Iterator \u5bf9\u8c61\uff0c\u5219\u5fc5\u7136\u6709\u4e00\u4e2a\u4e0e\u4e4b\u5173\u8054\u7684 Collection \u5bf9\u8c61\u3002Iterator \u63d0\u4f9b\u4e86\u4e24\u4e2a\u65b9\u6cd5\u6765\u8fed\u4ee3\u8bbf\u95ee Collection \u96c6\u5408\u91cc\u7684\u5143\u7d20\uff0c\u5e76\u53ef\u901a\u8fc7 remove() \u65b9\u6cd5\u6765\u5220\u9664\u96c6\u5408\u4e2d\u4e0a\u4e00\u6b21 next() \u65b9\u6cd5\u8fd4\u56de\u7684\u96c6\u5408\u5143\u7d20\u3002<\/p>\n\n\n\n<p>\u4e0a\u9762\u7a0b\u5e8f\u4e2d\u7b2c 24 \u884c\u4ee3\u7801\u5bf9\u8fed\u4ee3\u53d8\u91cf obj \u8fdb\u884c\u8d4b\u503c\uff0c\u4f46\u5f53\u518d\u6b21\u8f93\u5c80 objs \u96c6\u5408\u65f6\uff0c\u4f1a\u770b\u5230\u96c6\u5408\u91cc\u7684\u5143\u7d20\u6ca1\u6709\u4efb\u4f55\u6539\u53d8\u3002\u6240\u4ee5\u5f53\u4f7f\u7528 Iterator \u5bf9\u96c6\u5408\u5143\u7d20\u8fdb\u884c\u8fed\u4ee3\u65f6\uff0cIterator \u5e76\u4e0d\u662f\u628a\u96c6\u5408\u5143\u7d20\u672c\u8eab\u4f20\u7ed9\u4e86\u8fed\u4ee3\u53d8\u91cf\uff0c\u800c\u662f\u628a\u96c6\u5408\u5143\u7d20\u7684\u503c\u4f20\u7ed9\u4e86\u8fed\u4ee3\u53d8\u91cf\uff0c\u6240\u4ee5\u4fee\u6539\u8fed\u4ee3\u53d8\u91cf\u7684\u503c\u5bf9\u96c6\u5408\u5143\u7d20\u672c\u8eab\u6ca1\u6709\u4efb\u4f55\u5f71\u54cd\u3002<\/p>\n\n\n\n<p>\u5f53\u4f7f\u7528 Iterator \u8fed\u4ee3\u8bbf\u95ee Collection \u96c6\u5408\u5143\u7d20\u65f6\uff0cCollection \u96c6\u5408\u91cc\u7684\u5143\u7d20\u4e0d\u80fd\u88ab\u6539\u53d8\uff0c\u53ea\u6709\u901a\u8fc7 Iterator \u7684 remove() \u65b9\u6cd5\u5220\u9664\u4e0a\u4e00\u6b21 next() \u65b9\u6cd5\u8fd4\u56de\u7684\u96c6\u5408\u5143\u7d20\u624d\u53ef\u4ee5\uff0c\u5426\u5219\u5c06\u4f1a\u5f15\u53d1\u201cjava.util.ConcurrentModificationException\u201d\u5f02\u5e38\u3002\u4e0b\u9762\u7a0b\u5e8f\u793a\u8303\u4e86\u8fd9\u4e00\u70b9\u3002<\/p>\n\n\n\n<p>public class IteratorErrorTest { public static void main(String[] args) { \/\/ \u521b\u5efa\u4e00\u4e2a\u96c6\u5408 Collection objs = new HashSet(); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51Java\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b&#8221;); \/\/ \u83b7\u53d6books\u96c6\u5408\u5bf9\u5e94\u7684\u8fed\u4ee3\u5668 Iterator it = objs.iterator(); while (it.hasNext()) { String obj = (String) it.next(); System.out.println(obj); if (obj.equals(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b&#8221;)) { \/\/ \u4f7f\u7528Iterator\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\uff0c\u4e0d\u53ef\u4fee\u6539\u96c6\u5408\u5143\u7d20\uff0c\u4e0b\u9762\u4ee3\u7801\u5f15\u53d1\u5f02\u5e38 objs.remove(obj); } } } }<\/p>\n\n\n\n<p>\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n<p>C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b<\/p>\n\n\n\n<p>Exception in thread &#8220;main&#8221; java.util.ConcurrentModificationException<\/p>\n\n\n\n<p>at java.util.HashMap$HashIterator.nextNode(Unknown Source)<\/p>\n\n\n\n<p>at java.util.HashMap$KeyIterator.next(Unknown Source)<\/p>\n\n\n\n<p>at IteratorErrorTest.main(IteratorErrorTest.java:15)<\/p>\n\n\n\n<p>\u4e0a\u9762\u7a0b\u5e8f\u4e2d\u7b2c 15 \u884c\u4ee3\u7801\u4f4d\u4e8e Iterator \u8fed\u4ee3\u5757\u5185\uff0c\u4e5f\u5c31\u662f\u5728 Iterator \u8fed\u4ee3 Collection \u96c6\u5408\u8fc7\u7a0b\u4e2d\u4fee\u6539\u4e86 Collection \u96c6\u5408\uff0c\u6240\u4ee5\u7a0b\u5e8f\u5c06\u5728\u8fd0\u884c\u65f6\u5f15\u53d1\u5f02\u5e38\u3002<\/p>\n\n\n\n<p>Iterator \u8fed\u4ee3\u5668\u91c7\u7528\u7684\u662f\u5feb\u901f\u5931\u8d25\uff08fail-fast\uff09\u673a\u5236\uff0c\u4e00\u65e6\u5728\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u68c0\u6d4b\u5230\u8be5\u96c6\u5408\u5df2\u7ecf\u88ab\u4fee\u6539\uff08\u901a\u5e38\u662f\u7a0b\u5e8f\u4e2d\u7684\u5176\u4ed6\u7ebf\u7a0b\u4fee\u6539\uff09\uff0c\u7a0b\u5e8f\u7acb\u5373\u5f15\u53d1 ConcurrentModificationException \u5f02\u5e38\uff0c\u800c\u4e0d\u662f\u663e\u793a\u4fee\u6539\u540e\u7684\u7ed3\u679c\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u5171\u4eab\u8d44\u6e90\u800c\u5f15\u53d1\u7684\u6f5c\u5728\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u5feb\u901f\u5931\u8d25\uff08fail-fast\uff09\u673a\u5236\uff0c\u662f Java Collection \u96c6\u5408\u4e2d\u7684\u4e00\u79cd\u9519\u8bef\u68c0\u6d4b\u673a\u5236\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\uff1a\u4e0a\u9762\u7a0b\u5e8f\u5982\u679c\u6539\u4e3a\u5220\u9664\u201cC\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b\u201d\u5b57\u7b26\u4e32\uff0c\u5219\u4e0d\u4f1a\u5f15\u53d1\u5f02\u5e38\u3002\u8fd9\u6837\u53ef\u80fd\u6709\u4e9b\u8bfb\u8005\u4f1a\u201c\u5fc3\u5b58\u4fa5\u5e78\u201d\u5730\u60f3\uff0c\u5728\u8fed\u4ee3\u65f6\u597d\u50cf\u4e5f\u53ef\u4ee5\u5220\u9664\u96c6\u5408\u5143\u7d20\u554a\u3002\u5b9e\u9645\u4e0a\u8fd9\u662f\u4e00\u79cd\u5371\u9669\u7684\u884c\u4e3a\u3002\u5bf9\u4e8e HashSet \u4ee5\u53ca\u540e\u9762\u7684 ArrayList \u7b49\uff0c\u8fed\u4ee3\u65f6\u5220\u9664\u5143\u7d20\u90fd\u4f1a\u5bfc\u81f4\u5f02\u5e38\u3002\u53ea\u6709\u5728\u5220\u9664\u96c6\u5408\u4e2d\u7684\u67d0\u4e2a\u7279\u5b9a\u5143\u7d20\u65f6\u624d\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u8fd9\u662f\u7531\u96c6\u5408\u7c7b\u7684\u5b9e\u73b0\u4ee3\u7801\u51b3\u5b9a\u7684\uff0c\u7a0b\u5e8f\u5458\u4e0d\u5e94\u8be5\u8fd9\u4e48\u505a\u3002<\/p>\n\n\n\n<p><a href=\"http:\/\/c.biancheng.net\/view\/6795.html\">http:\/\/c.biancheng.net\/view\/6795.html<\/a><\/p>\n\n\n\n<p><strong>Java\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u904d\u5386Iterator\u8fed\u4ee3\u5668<\/strong><\/p>\n\n\n\n<p><a href=\"http:\/\/c.biancheng.net\/java\/\">Java<\/a>&nbsp;8 \u4e3a Iterator \u5f15\u5165\u4e86\u4e00\u4e2a forEachRemaining(Consumer action) \u9ed8\u8ba4\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u6240\u9700\u7684 Consumer \u53c2\u6570\u540c\u6837\u4e5f\u662f\u51fd\u6570\u5f0f\u63a5\u53e3\u3002\u5f53\u7a0b\u5e8f\u8c03\u7528 Iterator \u7684 forEachRemaining(Consumer action) \u904d\u5386\u96c6\u5408\u5143\u7d20\u65f6\uff0c\u7a0b\u5e8f\u4f1a\u4f9d\u6b21\u5c06\u96c6\u5408\u5143\u7d20\u4f20\u7ed9 Consumer \u7684 accept(T t) \u65b9\u6cd5\uff08\u8be5\u63a5\u53e3\u4e2d\u552f\u4e00\u7684\u62bd\u8c61\u65b9\u6cd5\uff09\u3002<\/p>\n\n\n\n<p>java.util.function \u4e2d\u7684 Function\u3001Supplier\u3001Consumer\u3001Predicate \u548c\u5176\u4ed6\u51fd\u6570\u5f0f\u63a5\u53e3\u88ab\u5e7f\u6cdb\u7528\u5728\u652f\u6301 Lambda \u8868\u8fbe\u5f0f\u7684 API \u4e2d\u3002\u201cvoid accept(T t);\u201d\u662f Consumer \u7684\u6838\u5fc3\u65b9\u6cd5\uff0c\u7528\u6765\u5bf9\u7ed9\u5b9a\u7684\u53c2\u6570 T \u6267\u884c\u5b9a\u4e49\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u5982\u4e0b\u7a0b\u5e8f\u793a\u8303\u4e86\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u6765\u904d\u5386\u96c6\u5408\u5143\u7d20\u3002<\/p>\n\n\n\n<p>public class IteratorEach { public static void main(String[] args) { \/\/ \u521b\u5efa\u4e00\u4e2a\u96c6\u5408 Collection objs = new HashSet(); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51Java\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b&#8221;); \/\/ \u83b7\u53d6objs\u96c6\u5408\u5bf9\u5e94\u7684\u8fed\u4ee3\u5668 Iterator it = objs.iterator(); \/\/ \u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\uff08\u76ee\u6807\u7c7b\u578b\u662fComsumer\uff09\u6765\u904d\u5386\u96c6\u5408\u5143\u7d20 it.forEachRemaining(obj -&gt; System.out.println(&#8220;\u8fed\u4ee3\u96c6\u5408\u5143\u7d20\uff1a&#8221; + obj)); } }<\/p>\n\n\n\n<p>\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n<p>\u8fed\u4ee3\u96c6\u5408\u5143\u7d20\uff1aC\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b<\/p>\n\n\n\n<p>\u8fed\u4ee3\u96c6\u5408\u5143\u7d20\uff1aC\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b<\/p>\n\n\n\n<p>\u8fed\u4ee3\u96c6\u5408\u5143\u7d20\uff1aC\u8bed\u8a00\u4e2d\u6587\u7f51Java\u6559\u7a0b<\/p>\n\n\n\n<p>\u9762\u7a0b\u5e8f\u4e2d\u7b2c 11 \u884c\u4ee3\u7801\u8c03\u7528\u4e86 Iterator \u7684 forEachRemaining() \u65b9\u6cd5\u6765\u904d\u5386\u96c6\u5408\u5143\u7d20\uff0c\u4f20\u7ed9\u8be5\u65b9\u6cd5\u7684\u53c2\u6570\u662f\u4e00\u4e2a Lambda \u8868\u8fbe\u5f0f\uff0c\u8be5 Lambda \u8868\u8fbe\u5f0f\u7684\u76ee\u6807\u7c7b\u578b\u662f Consumer\uff0c\u56e0\u6b64\u4e0a\u9762\u4ee3\u7801\u4e5f\u53ef\u7528\u4e8e\u904d\u5386\u96c6\u5408\u5143\u7d20\u3002<\/p>\n\n\n\n<p><a href=\"http:\/\/c.biancheng.net\/view\/6797.html\">http:\/\/c.biancheng.net\/view\/6797.html<\/a><\/p>\n\n\n\n<p><strong>Java\u4f7f\u7528foreach\u5faa\u73af\u904d\u5386Collection\u96c6\u5408<\/strong><\/p>\n\n\n\n<p>\u300aJava Iterator\u904d\u5386Collection\u96c6\u5408\u5143\u7d20\u300b\u4e00\u8282\u4e2d\u4e3b\u8981\u8bb2\u89e3\u5982\u4f55\u4f7f\u7528 Iterator \u63a5\u53e3\u8fed\u4ee3\u8bbf\u95ee Collection \u96c6\u5408\u91cc\u7684\u5143\u7d20\uff0c\u9664\u4e86\u8fd9\u4e2a\u65b9\u6cd5\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528 Java 5 \u63d0\u4f9b\u7684 foreach \u5faa\u73af\u8fed\u4ee3\u8bbf\u95ee\u96c6\u5408\u5143\u7d20\uff0c\u800c\u4e14\u66f4\u52a0\u4fbf\u6377\u3002\u5982\u4e0b\u7a0b\u5e8f\u793a\u8303\u4e86\u4f7f\u7528 foreach \u5faa\u73af\u6765\u8fed\u4ee3\u8bbf\u95ee\u96c6\u5408\u5143\u7d20\u3002<\/p>\n\n\n\n<p>public class ForeachTest { public static void main(String[] args) { \/\/ \u521b\u5efa\u4e00\u4e2a\u96c6\u5408 Collection objs = new HashSet(); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51Java\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b&#8221;); objs.add(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b&#8221;); for (Object obj : objs) { \/\/ \u6b64\u5904\u7684obj\u53d8\u91cf\u4e5f\u4e0d\u662f\u96c6\u5408\u5143\u7d20\u672c\u8eab String obj1 = (String) obj; System.out.println(obj1); if (obj1.equals(&#8220;C\u8bed\u8a00\u4e2d\u6587\u7f51Java\u6559\u7a0b&#8221;)) { \/\/ \u4e0b\u9762\u4ee3\u7801\u4f1a\u5f15\u53d1 ConcurrentModificationException \u5f02\u5e38 objs.remove(obj); } } System.out.println(objs); } }<\/p>\n\n\n\n<p>\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n<p>C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b<\/p>\n\n\n\n<p>C\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b<\/p>\n\n\n\n<p>C\u8bed\u8a00\u4e2d\u6587\u7f51Java\u6559\u7a0b<\/p>\n\n\n\n<p>[C\u8bed\u8a00\u4e2d\u6587\u7f51C++\u6559\u7a0b, C\u8bed\u8a00\u4e2d\u6587\u7f51C\u8bed\u8a00\u6559\u7a0b]<\/p>\n\n\n\n<p>\u4e0a\u9762\u4ee3\u7801\u4f7f\u7528 foreach \u5faa\u73af\u6765\u8fed\u4ee3\u8bbf\u95ee Collection \u96c6\u5408\u91cc\u7684\u5143\u7d20\u66f4\u52a0\u7b80\u6d01\uff0c\u8fd9\u6b63\u662f JDK 1.5 \u7684 foreach \u5faa\u73af\u5e26\u6765\u7684\u4f18\u52bf\u3002\u4e0e\u4f7f\u7528 Iterator \u63a5\u53e3\u8fed\u4ee3\u8bbf\u95ee\u96c6\u5408\u5143\u7d20\u7c7b\u4f3c\u7684\u662f\uff0cforeach \u5faa\u73af\u4e2d\u7684\u8fed\u4ee3\u53d8\u91cf\u4e5f\u4e0d\u662f\u96c6\u5408\u5143\u7d20\u672c\u8eab\uff0c\u7cfb\u7edf\u53ea\u662f\u4f9d\u6b21\u628a\u96c6\u5408\u5143\u7d20\u7684\u503c\u8d4b\u7ed9\u8fed\u4ee3\u53d8\u91cf\uff0c\u56e0\u6b64\u5728 foreach \u5faa\u73af\u4e2d\u4fee\u6539\u8fed\u4ee3\u53d8\u91cf\u7684\u503c\u4e5f\u6ca1\u6709\u4efb\u4f55\u5b9e\u9645\u610f\u4e49\u3002<\/p>\n\n\n\n<p>\u540c\u6837\uff0c\u5f53\u4f7f\u7528 foreach \u5faa\u73af\u8fed\u4ee3\u8bbf\u95ee\u96c6\u5408\u5143\u7d20\u65f6\uff0c\u8be5\u96c6\u5408\u4e5f\u4e0d\u80fd\u88ab\u6539\u53d8\uff0c\u5426\u5219\u5c06\u5f15\u53d1 ConcurrentModificationException \u5f02\u5e38\u3002\u6240\u4ee5\u4e0a\u9762\u7a0b\u5e8f\u4e2d\u7b2c 14 \u884c\u4ee3\u7801\u5904\u5c06\u5f15\u53d1\u8be5\u5f02\u5e38\u3002<\/p>\n\n\n\n<p><a href=\"http:\/\/c.biancheng.net\/view\/6798.html\">http:\/\/c.biancheng.net\/view\/6798.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Iterator\uff08\u8fed\u4ee3\u5668\uff09\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u7684\u4f5c\u7528\u5c31\u662f\u904d\u5386\u5bb9\u5668\u7684\u6240\u6709\u5143\u7d20&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/posts\/13"}],"collection":[{"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/comments?post=13"}],"version-history":[{"count":1,"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/posts\/13\/revisions"}],"predecessor-version":[{"id":14,"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/posts\/13\/revisions\/14"}],"wp:attachment":[{"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/media?parent=13"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/categories?post=13"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.greatfar.cn\/wp-json\/wp\/v2\/tags?post=13"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}