\u4efb\u4f55\u5bb9\u5668\u7c7b\uff0c\u90fd\u5fc5\u987b\u6709\u67d0\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5c06\u4e1c\u897f\u653e\u8fdb\u53bb\uff0c\u7136\u540e\u7531\u67d0\u79cd\u65b9\u5f0f\u5c06\u4e1c\u897f\u53d6\u51fa\u6765\u3002\u6bd5\u7adf\uff0c\u5b58\u653e\u4e8b\u7269\u662f\u5bb9\u5668\u6700\u57fa\u672c\u7684\u5de5\u4f5c\u3002\u5bf9\u4e8eArrayList\uff0cadd\uff08\uff09\u662f\u63d2\u5165\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u800cget()\u662f\u53d6\u51fa\u5143\u7d20\u7684\u65b9\u5f0f\u4e4b\u4e00\u3002ArrayList\u5f88\u7075\u6d3b\uff0c\u53ef\u4ee5\u968f\u65f6\u9009\u53d6\u4efb\u610f\u7684\u5143\u7d20\uff0c\u6216\u4f7f\u7528\u4e0d\u540c\u7684\u4e0b\u6807\u4e00\u6b21\u9009\u53d6\u591a\u4e2a\u5143\u7d20\u3002\u00a0
\n<\/p>\n
\u5982\u679c\u4ece\u66f4\u9ad8\u5c42\u7684\u89d2\u5ea6\u601d\u8003\uff0c\u4f1a\u53d1\u73b0\u8fd9\u91cc\u6709\u4e00\u4e2a\u7f3a\u70b9\uff1a\u8981\u4f7f\u7528\u5bb9\u5668\uff0c\u5fc5\u987b\u77e5\u9053\u5176\u4e2d\u5143\u7d20\u7684\u786e\u5207\u7c7b\u578b\u3002\u521d\u770b\u8d77\u6765\u8fd9\u6ca1\u6709\u4ec0\u4e48\u4e0d\u597d\u7684\uff0c\u4f46\u662f\u8003\u8651\u5982\u4e0b\u60c5\u51b5\uff1a\u5982\u679c\u539f\u672c\u662fArrayList \uff0c\u4f46\u662f\u540e\u6765\u8003\u8651\u5230\u5bb9\u5668\u7684\u7279\u70b9\uff0c\u4f60\u60f3\u6362\u7528Set \uff0c\u5e94\u8be5\u600e\u4e48\u505a\uff1f\u6216\u8005\u4f60\u6253\u7b97\u5199\u901a\u7528\u7684\u4ee3\u7801\uff0c\u5b83\u4eec\u53ea\u662f\u4f7f\u7528\u5bb9\u5668\uff0c\u4e0d\u77e5\u9053\u6216\u8005\u8bf4\u4e0d\u5173\u5fc3\u5bb9\u5668\u7684\u7c7b\u578b\uff0c\u90a3\u4e48\u5982\u4f55\u624d\u80fd\u4e0d\u91cd\u5199\u4ee3\u7801\u5c31\u53ef\u4ee5\u5e94\u7528\u4e8e\u4e0d\u540c\u7c7b\u578b\u7684\u5bb9\u5668\uff1f\u00a0
\n\u00a0
\n\u6240\u4ee5\u8fed\u4ee3\u5668(Iterator)\u7684\u6982\u5ff5\uff0c\u4e5f\u662f\u51fa\u4e8e\u4e00\u79cd\u8bbe\u8ba1\u6a21\u5f0f\u5c31\u662f\u4e3a\u8fbe\u6210\u6b64\u76ee\u7684\u800c\u5f62\u6210\u7684\u3002\u6240\u4ee5Collection\u4e0d\u63d0\u4f9bget()\u65b9\u6cd5\u3002\u5982\u679c\u8981\u904d\u5386Collectin\u4e2d\u7684\u5143\u7d20\uff0c\u5c31\u5fc5\u987b\u7528Iterator\u3002\u00a0<\/p>\n
\u8fed\u4ee3\u5668\uff08Iterator\uff09\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b83\u7684\u5de5\u4f5c\u5c31\u662f\u904d\u5386\u5e76\u9009\u62e9\u96c6\u5408\u5e8f\u5217\u4e2d\u7684\u5bf9\u8c61\uff0c\u800c\u5ba2\u6237\u7aef\u7684\u7a0b\u5e8f\u5458\u4e0d\u5fc5\u77e5\u9053\u6216\u5173\u5fc3\u8be5\u5e8f\u5217\u5e95\u5c42\u7684\u7ed3\u6784\u3002\u6b64\u5916\uff0c\u8fed\u4ee3\u5668\u901a\u5e38\u88ab\u79f0\u4e3a\u201c\u8f7b\u91cf\u7ea7\u201d\u5bf9\u8c61\uff0c\u521b\u5efa\u5b83\u7684\u4ee3\u4ef7\u5c0f\u3002\u4f46\u662f\uff0c\u5b83\u4e5f\u6709\u4e00\u4e9b\u9650\u5236\uff0c\u4f8b\u5982\uff0c\u67d0\u4e9b\u8fed\u4ee3\u5668\u53ea\u80fd\u5355\u5411\u79fb\u52a8\u3002\u00a0
\nCollection \u63a5\u53e3\u7684\u00a0iterator() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u00a0Iterator\u3002Iterator \u548c\u60a8\u53ef\u80fd\u5df2\u7ecf\u719f\u6089\u7684\u00a0Enumeration \u63a5\u53e3\u7c7b\u4f3c\u3002\u4f7f\u7528\u00a0Iterator \u63a5
\n\u53e3\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u4ece\u5934\u81f3\u5c3e\u904d\u5386\u96c6\u5408\uff0c\u5e76\u5b89\u5168\u7684\u4ece\u5e95\u5c42\u00a0Collection \u4e2d\u9664\u53bb\u5143\u7d20\u3002\u00a0<\/p>\n
\u4e0b\u9762\uff0c\u6211\u4eec\u770b\u4e00\u4e2a\u5bf9\u4e8e\u8fed\u4ee3\u5668\u7684\u7b80\u5355\u4f7f\u7528\uff1a\u00a0
\n[java]import java.util.ArrayList;
\nimport java.util.Collection;
\nimport java.util.Iterator; \u00a0\u00a0
\npublic class IteratorDemo {
\n\u00a0public static void main(String[] args) { \u00a0\u00a0
\n Collection collection = new ArrayList(); \u00a0\u00a0
\n collection.add("s1");
\n \u00a0\u00a0collection.add("s2");
\n\u00a0\u00a0 collection.add("s3");
\n\u00a0\u00a0
\n Iterator iterator = collection.iterator();\/\/\u5f97\u5230\u4e00\u4e2a\u8fed\u4ee3\u5668\u00a0
\n\u00a0\u00a0 while (iterator.hasNext()) {\/\/\u904d\u5386\u00a0\u00a0\u00a0\u00a0Object element = iterator.next(); \u00a0\u00a0\u00a0
\n System.out.println("iterator = "\u00a0+ element);
\n\u00a0 \u00a0}
\n\u00a0 \u00a0if(collection.isEmpty()) \u00a0\u00a0\u00a0
\n System.out.println("collection is Empty!"); \u00a0\u00a0
\n else \u00a0\u00a0
\n System.out.println("collection is not Empty! size="+collection.size());
\n\u00a0
\n \u00a0Iterator iterator2 = collection.iterator(); \u00a0
\n \u00a0while (iterator2.hasNext()) {\/\/\u79fb\u9664\u5143\u7d20\u00a0\u00a0\u00a0\u00a0
\n Object element = iterator2.next();
\n\u00a0\u00a0\u00a0System.out.println("remove: "+element); \u00a0\u00a0\u00a0
\n iterator2.remove();
\n\u00a0\u00a0} \u00a0
\n\u00a0
\n\u00a0\u00a0Iterator iterator3 = collection.iterator();
\n\u00a0\u00a0\u00a0if (!iterator3.hasNext()) {\/\/\u5bdf\u770b\u662f\u5426\u8fd8\u6709\u5143\u7d20\u00a0\u00a0
\n \u00a0\u00a0System.out.println("\u8fd8\u6709\u5143\u7d20"); \u00a0\u00a0
\n } \u00a0<\/p>\n
if(collection.isEmpty())
\n System.out.println("collection is Empty!");
\n\u00a0 \/\/\u4f7f\u7528collection.isEmpty()\u65b9\u6cd5\u6765\u5224\u65ad\u00a0\u00a0
\n }
\n} [\/java]
\n\u7a0b\u5e8f\u7684\u8fd0\u884c\u7ed3\u679c\u4e3a\uff1a\u00a0
\niterator = s1
\niterator = s2
\niterator = s3
\ncollection is not Empty! size=3
\nremove: s1
\nremove: s2
\nremove: s3
\n\u8fd8\u6709\u5143\u7d20\u00a0
\ncollection is Empty! <\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0cJava\u7684Collection\u7684Iterator \u80fd\u591f\u7528\u6765\uff0c\uff1a\u00a0
\n1) \u4f7f\u7528\u65b9\u6cd5 iterator() \u8981\u6c42\u5bb9\u5668\u8fd4\u56de\u4e00\u4e2aIterator .\u7b2c\u4e00\u6b21\u8c03\u7528Iterator \u7684next() \u65b9\u6cd5\u65f6\uff0c\u5b83\u8fd4\u56de\u96c6\u5408\u5e8f\u5217\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u3002
\n2) \u4f7f\u7528next() \u83b7\u5f97\u96c6\u5408\u5e8f\u5217\u7684\u4e2d\u7684\u4e0b\u4e00\u4e2a\u5143\u7d20\u3002\u00a0
\n3) \u4f7f\u7528hasNext()\u68c0\u67e5\u5e8f\u5217\u4e2d\u662f\u5426\u5143\u7d20\u3002\u00a0
\n4) \u4f7f\u7528remove()\u5c06\u8fed\u4ee3\u5668\u65b0\u8fd4\u56de\u7684\u5143\u7d20\u5220\u9664\u3002\u00a0
\n\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u65b9\u6cd5\u5220\u9664\u7531next\u65b9\u6cd5\u8fd4\u56de\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\uff0c\u5728\u6bcf\u6b21\u8c03\u7528next\u65f6\uff0cremove\u65b9\u6cd5\u53ea\u80fd\u88ab\u8c03\u7528\u4e00\u6b21\u00a0\u3002\u00a0
\n\u5927\u5bb6\u770b\uff0cJava \u5b9e\u73b0\u7684\u8fd9\u4e2a\u8fed\u4ee3\u5668\u7684\u4f7f\u7528\u5c31\u662f\u5982\u6b64\u7684\u7b80\u5355\u3002Iterator\uff08\u8dcc\u4ee3\u5668\uff09\u867d\u7136\u529f\u80fd\u7b80\u5355\uff0c\u4f46\u4ecd\u7136\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u89e3\u51b3\u8bb8\u591a\u95ee\u9898\uff0c\u540c\u65f6\u9488\u5bf9List \u8fd8\u6709\u4e00\u4e2a\u66f4\u590d\u6742\u66f4\u9ad8\u7ea7\u7684ListIterator\u3002\u60a8\u53ef\u4ee5\u5728\u4e0b\u9762\u7684List\u8bb2\u89e3\u4e2d\u5f97\u5230\u8fdb\u4e00\u6b65\u7684\u4ecb\u7ecd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4efb\u4f55\u5bb9\u5668\u7c7b\uff0c\u90fd\u5fc5\u987b\u6709\u67d0\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5c06\u4e1c\u897f\u653e\u8fdb\u53bb\uff0c\u7136\u540e\u7531\u67d0\u79cd\u65b9\u5f0f\u5c06\u4e1c\u897f\u53d6\u51fa\u6765\u3002\u6bd5\u7adf\uff0c\u5b58\u653e\u4e8b\u7269\u662f\u5bb9\u5668\u6700\u57fa\u672c\u7684\u5de5\u4f5c\u3002\u5bf9 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/650"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=650"}],"version-history":[{"count":1,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/650\/revisions"}],"predecessor-version":[{"id":651,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/650\/revisions\/651"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}