{"id":462,"date":"2013-08-02T11:23:08","date_gmt":"2013-08-02T03:23:08","guid":{"rendered":"http:\/\/blog.dayandcarrot.net\/?p=462"},"modified":"2013-08-02T11:23:08","modified_gmt":"2013-08-02T03:23:08","slug":"java%e4%b8%adhashmap%e9%81%8d%e5%8e%86%e7%9a%84%e4%b8%a4%e7%a7%8d%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/dayandcarrot.space\/?p=462","title":{"rendered":"Java\u4e2dHashMap\u904d\u5386\u7684\u4e24\u79cd\u65b9\u5f0f"},"content":{"rendered":"

\u539f\u6587\u5730\u5740: http:\/\/www.javaweb.cc\/language\/java\/032291.shtml
\n\u7b2c\u4e00\u79cd:
\n\u3000\u3000<\/p>\n

\nMap map = new HashMap();\n\u3000\u3000Iterator iter = map.entrySet().iterator();\n\u3000\u3000while (iter.hasNext()) {\n\u3000\u3000Map.Entry entry = (Map.Entry) iter.next();\n\u3000\u3000Object key = entry.getKey();\n\u3000\u3000Object val = entry.getValue();\n\u3000\u3000}\n<\/pre>\n
\u3000\u3000\u6548\u7387\u9ad8,\u4ee5\u540e\u4e00\u5b9a\u8981\u4f7f\u7528\u6b64\u79cd\u65b9\u5f0f\uff01
\n\u7b2c\u4e8c\u79cd:
\n\u3000\u3000<\/p>\n
\nMap map = new HashMap();\n\u3000\u3000Iterator iter = map.keySet().iterator();\n\u3000\u3000while (iter.hasNext()) {\n\u3000\u3000Object key = iter.next();\n\u3000\u3000Object val = map.get(key);\n\u3000\u3000}\n<\/pre>\n
\u3000\u3000\u6548\u7387\u4f4e,\u4ee5\u540e\u5c3d\u91cf\u5c11\u4f7f\u7528\uff01
\n       HashMap\u7684\u904d\u5386\u6709\u4e24\u79cd\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u90a3\u5c31\u662f\u4f7f\u7528keyset\u53caentryset\u6765\u8fdb\u884c\u904d\u5386\uff0c\u4f46\u4e24\u8005\u7684\u904d\u5386\u901f\u5ea6\u662f\u6709\u5dee\u522b\u7684\uff0c\u4e0b\u9762\u8bf7\u770b\u5b9e\u4f8b\uff1a
\n\u3000\u3000public class HashMapTest {
\n\u3000\u3000public static void main(String[] args) …{
\n\u3000\u3000HashMap hashmap = new HashMap();
\n\u3000\u3000for (int i = 0; i < 1000; i ) …{
\n\u3000\u3000hashmap.put(“” i, “thanks”);
\n\u3000\u3000}
\n\u3000\u3000long bs = Calendar.getInstance().getTimeInMillis();
\n\u3000\u3000Iterator iterator = hashmap.keySet().iterator();
\n\u3000\u3000while (iterator.hasNext()) …{
\n\u3000\u3000System.out.print(hashmap.get(iterator.next()));
\n\u3000\u3000}
\n\u3000\u3000System.out.println();
\n\u3000\u3000System.out.println(Calendar.getInstance().getTimeInMillis() – bs);
\n\u3000\u3000listHashMap();
\n\u3000\u3000}
\n\u3000\u3000public static void listHashMap() …{
\n\u3000\u3000java.util.HashMap hashmap = new java.util.HashMap();
\n\u3000\u3000for (int i = 0; i < 1000; i ) …{
\n\u3000\u3000hashmap.put(“” i, “thanks”);
\n\u3000\u3000}
\n\u3000\u3000long bs = Calendar.getInstance().getTimeInMillis();
\n\u3000\u3000java.util.Iterator it = hashmap.entrySet().iterator();
\n\u3000\u3000while (it.hasNext()) …{
\n\u3000\u3000java.util.Map.Entry entry = (java.util.Map.Entry) it.next();
\n\u3000\u3000\/\/ entry.getKey() \u8fd4\u56de\u4e0e\u6b64\u9879\u5bf9\u5e94\u7684\u952e
\n\u3000\u3000\/\/ entry.getValue() \u8fd4\u56de\u4e0e\u6b64\u9879\u5bf9\u5e94\u7684\u503c
\n\u3000\u3000System.out.print(entry.getValue());
\n\u3000\u3000}
\n\u3000\u3000System.out.println();
\n\u3000\u3000System.out.println(Calendar.getInstance().getTimeInMillis() – bs);
\n\u3000\u3000}
\n\u3000\u3000}
\n\u3000\u3000\u5bf9\u4e8ekeySet\u5176\u5b9e\u662f\u904d\u5386\u4e862\u6b21\uff0c\u4e00\u6b21\u662f\u8f6c\u4e3aiterator\uff0c\u4e00\u6b21\u5c31\u4ecehashmap\u4e2d\u53d6\u51fakey\u6240\u5bf9\u4e8e\u7684value\u3002\u800centryset\u53ea\u662f\u904d\u5386\u4e86\u7b2c\u4e00\u6b21\uff0c\u4ed6\u628akey\u548cvalue\u90fd\u653e\u5230\u4e86entry\u4e2d\uff0c\u6240\u4ee5\u5c31\u5feb\u4e86\u3002
\nJava\u4e2dHashMap\u904d\u5386\u7684\u4e24\u79cd\u65b9\u5f0f(\u672c\u6559\u7a0b\u4ec5\u4f9b\u7814\u7a76\u548c\u5b66\u4e60\uff0c\u4e0d\u4ee3\u8868JAVA\u4e2d\u6587\u7f51\u89c2\u70b9)
\n\u672c\u7bc7\u6587\u7ae0\u94fe\u63a5\u5730\u5740:http:\/\/www.javaweb.cc\/language\/java\/032291.shtml
\n\u5982\u9700\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u81eaJAVA\u4e2d\u6587\u7f51:http:\/\/www.javaweb.cc\/<\/p>\n","protected":false},"excerpt":{"rendered":"
\u539f\u6587\u5730\u5740: http:\/\/www.javaweb.cc\/language\/java\/032291.shtml \u7b2c\u4e00\u79cd: \u3000\u3000 Map map = new HashMap(); \u3000\u3000Iterator iter = map.entrySet().iterator(); \u3000\u3000while (iter.hasNext()) { \u3000\u3000Map.Entry entry = (Map.Entry) iter.next(); \u3000\u3000Object key = entry.getKey(); \u3000\u3000Object val = entry.getValue(); \u3000\u3000} \u3000\u3000\u6548\u7387\u9ad8,\u4ee5\u540e\u4e00\u5b9a\u8981\u4f7f\u7528\u6b64\u79cd\u65b9\u5f0f\uff01 \u7b2c\u4e8c\u79cd: \u3000\u3000 Map map = new HashMap(); \u3000\u3000Iterator iter = map.keySet().iterator(); \u3000\u3000while (iter.hasNext()) { \u3000\u3000Object key = iter.next(); \u3000\u3000Object val = map.get(key); \u3000\u3000} \u3000\u3000\u6548\u7387\u4f4e,\u4ee5\u540e\u5c3d\u91cf\u5c11\u4f7f\u7528\uff01 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[60],"class_list":["post-462","post","type-post","status-publish","format-standard","hentry","category-study","tag-java"],"_links":{"self":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts\/462","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=462"}],"version-history":[{"count":0,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts\/462\/revisions"}],"wp:attachment":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=462"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=462"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=462"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}