{"id":607,"date":"2019-08-17T17:49:07","date_gmt":"2019-08-17T09:49:07","guid":{"rendered":"http:\/\/prayerlaputa.com\/?p=607"},"modified":"2019-08-17T17:49:07","modified_gmt":"2019-08-17T09:49:07","slug":"arrays-aslist%e4%b8%ad%e6%89%80%e9%81%87%e5%88%b0%e7%9a%84%e5%9d%91%e3%80%90%e8%bd%ac%e8%bd%bd%e3%80%91","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=607","title":{"rendered":"Arrays.asList\u4e2d\u6240\u9047\u5230\u7684\u5751\u3010\u8f6c\u8f7d\u3011"},"content":{"rendered":"<p>\u8f6c\u8f7d\u81ea\uff1ahttps:\/\/www.cnblogs.com\/wang-meng\/p\/f1532cf23ce049ce63b4bdd62d53659d.html<\/p>\n<h2 id=\"\u524d\u8a00\">\u524d\u8a00<\/h2>\n<p>\u6700\u8fd1\u5728\u9879\u76ee\u4e0a\u7ebf\u7684\u65f6\u5019\u53d1\u73b0\u4e00\u4e2a\u95ee\u9898\uff0c\u4ece\u540e\u53f0\u62a5\u9519\u65e5\u5fd7\u770b\uff1a<strong>java.lang.UnsupportedOperationException\u5f02\u5e38<\/strong><br \/>\n\u4ece\u4ee3\u7801\u5b9a\u4f4d\u6765\u770b\uff0c\u539f\u6765\u662f\u4f7f\u7528\u4e86Arrays.asList()\u65b9\u6cd5\u65f6\u628a\u4e00\u4e2a\u6570\u7ec4\u8f6c\u5316\u6210List\u5217\u8868\u65f6\uff0c\u5bf9\u5f97\u5230\u7684List\u5217\u8868\u8fdb\u884cadd()\u548cremove()\u64cd\u4f5c, \u6240\u4ee5\u5bfc\u81f4\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u5bf9\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u73b0\u5728\u6765\u603b\u7ed3\u4e0b\uff0c\u5f53\u7136\u4f1a\u603b\u7ed3Arrays\u4e0b\u9762\u7684\u4e00\u4e9b\u5751\u3002<!--more--><\/p>\n<h2 id=\"\u6e90\u4ee3\u7801\u5206\u6790\">\u6e90\u4ee3\u7801\u5206\u6790<\/h2>\n<p>\u9996\u5148\uff0c\u9047\u5230\u95ee\u9898\u4e0d\u53ef\u6015\uff0c\u9047\u5230\u95ee\u9898\u89e3\u51b3\u5c31\u662f\u4e86\uff0c\u4f46\u662f\u5fc5\u987b\u8981\u4fdd\u8bc1\u4e0b\u6b21\u4e0d\u4f1a\u518d\u72af\u76f8\u540c\u7684\u95ee\u9898\u3002<br \/>\nArrays.asList\u8fd4\u56de\u7684\u662f\u540c\u6837\u7684ArrayList\uff0c\u4e3a\u4ec0\u4e48\u5c31\u4e0d\u80fd\u4f7f\u7528add\u548cremove\u65b9\u6cd5\u5462\uff1f<\/p>\n<p>1\uff0c\u67e5\u770bArrays.asList \u6e90\u7801<br \/>\n<img src=\"https:\/\/img2018.cnblogs.com\/blog\/799093\/201810\/799093-20181014221109823-1745635954.png\" alt=\"\" \/>,<\/p>\n<p>2\uff0c\u67e5\u770b\u6b64ArrayList\u7ed3\u6784\uff1a<br \/>\n<img src=\"https:\/\/img2018.cnblogs.com\/blog\/799093\/201810\/799093-20181014221110187-1077018580.png\" alt=\"\" \/><\/p>\n<p>3\uff0c \u5728\u67e5\u770bAbstractList\u7ed3\u6784\uff1a<br \/>\n<img src=\"https:\/\/img2018.cnblogs.com\/blog\/799093\/201810\/799093-20181014221110706-1882850228.png\" alt=\"\" \/><\/p>\n<p>\u679c\u7136\uff0cUnsupportedOperationException \u662f\u8fd9\u91cc\u629b\u51fa\u7684\uff0c\u56e0\u4e3aArrays\u4e2d\u7684ArrayList\u5e76\u6ca1\u6709\u5b9e\u73b0\u6b64\u65b9\u6cd5\uff0c\u6545\u629b\u51fa\u4e86\u5f02\u5e38\u3002<br \/>\n<strong>\u6240\u4ee5\u8bf4 Arrays.asList \u8fd4\u56de\u7684 List \u662f\u4e00\u4e2a\u4e0d\u53ef\u53d8\u957f\u5ea6\u7684\u5217\u8868\uff0c\u6b64\u5217\u8868\u4e0d\u518d\u5177\u5907\u539f List \u7684\u5f88\u591a\u7279\u6027\uff0c\u56e0\u6b64\u614e\u7528 Arrays.asList \u65b9\u6cd5\u3002<\/strong><\/p>\n<h2 id=\"Arrays\u4e2d\u5176\u4ed6\u5751\">Arrays\u4e2d\u5176\u4ed6\u5751<\/h2>\n<p>1\uff0c\u4e0b\u9762\u7a0b\u5e8f\u8f93\u51fa\u662f\u4ec0\u4e48\uff1f<br \/>\n<img src=\"https:\/\/img2018.cnblogs.com\/blog\/799093\/201810\/799093-20181014221111014-1921967414.png\" alt=\"\" \/><br \/>\n<strong>\u6253\u5370\u7ed3\u679c\u662f\uff1a1<\/strong><br \/>\n\u7531\u4e0a\u9762asList \u6e90\u7801\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd4\u56de\u7684 Arrays \u7684\u5185\u90e8\u7c7b ArrayList \u6784\u9020\u65b9\u6cd5\u63a5\u6536\u7684\u662f\u4e00\u4e2a\u7c7b\u578b\u4e3a T \u7684\u6570\u7ec4\uff0c\u800c\u57fa\u672c\u7c7b\u578b\u662f\u4e0d\u80fd\u4f5c\u4e3a\u6cdb\u578b\u53c2\u6570\u7684\uff0c\u6240\u4ee5\u8fd9\u91cc\u53c2\u6570 a \u53ea\u80fd\u63a5\u6536\u5f15\u7528\u7c7b\u578b\uff0c\u81ea\u7136\u4e3a\u4e86\u7f16\u8bd1\u901a\u8fc7\u7f16\u8bd1\u5668\u5c31\u628a\u4e0a\u9762\u7684 int[] \u6570\u7ec4\u5f53\u505a\u4e86\u4e00\u4e2a\u5f15\u7528\u53c2\u6570\uff0c\u6240\u4ee5 size \u4e3a 1\uff0c\u8981\u60f3\u4fee\u6539\u8fd9\u4e2a\u95ee\u9898\u5f88\u7b80\u5355\uff0c\u5c06 int[] \u6362\u6210 Integer[] \u5373\u53ef\u3002\u6240\u4ee5<strong>\u539f\u59cb\u7c7b\u578b\u4e0d\u80fd\u4f5c\u4e3a Arrays.asList \u65b9\u6cd5\u7684\u53c2\u6570\uff0c\u5426\u5219\u4f1a\u88ab\u5f53\u505a\u4e00\u4e2a\u53c2\u6570\u3002<\/strong><\/p>\n<p>2\uff0cCollections.toArray\u62a5\u9519\u95ee\u9898<br \/>\n\u5927\u5bb6\u53ef\u4ee5\u770b\u4e0b java.util.ArrayList \u6e90\u7801 \u4e2d\u7279\u522b\u6807\u8bb0\u6709\u4e00\u53e5\u8bdd\u5982\u4e0b\uff1a<br \/>\n<img src=\"https:\/\/img2018.cnblogs.com\/blog\/799093\/201810\/799093-20181014221111414-531849769.png\" alt=\"\" \/><br \/>\nBug\u5730\u5740\uff1a<a href=\"https:\/\/bugs.java.com\/view_bug.do?bug_id=6260652\">https:\/\/bugs.java.com\/view_bug.do?bug_id=6260652<\/a><br \/>\n\u90a3\u4e0b\u9762\u6765\u8bd5\u9a8c\u4e0b\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u51fa\u73b0\u8fd9\u79cd\u5f02\u5e38\uff1a<br \/>\n<img src=\"https:\/\/img2018.cnblogs.com\/blog\/799093\/201810\/799093-20181014221111730-2078070269.png\" alt=\"\" \/><\/p>\n<p>\u5982\u4e0a\u56fe\uff0c\u8fd9\u79cd\u63a7\u5236\u53f0\u6253\u5370\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<br \/>\n<strong>class [Ljava.lang.String;<\/strong><br \/>\n<strong>Exception in thread &#8220;main&#8221; java.lang.ArrayStoreException: java.lang.Object<\/strong><\/p>\n<p>\u6211\u4eec\u67e5\u770bArrays\u4e2dArrayList\u7684toArray\u6e90\u7801\uff1a<br \/>\n<img src=\"https:\/\/img2018.cnblogs.com\/blog\/799093\/201810\/799093-20181014221112085-400703368.png\" alt=\"\" \/><br \/>\n\u56e0\u4e3aasList\u8fd4\u56de\u7684\u662f\u4e00\u4e2aString\u6570\u7ec4\uff0c\u6240\u4ee5\u8fd9\u91cctoArray\u8fd4\u56de\u7684\u5176\u5b9e\u662fString[]\u7c7b\u578b\uff0c\u53ea\u4e0d\u8fc7\u662f\u8fd9\u91cc\u505a\u4e86\u4e00\u4e2a\u5411\u4e0a\u8f6c\u578b\uff0c\u5c06String[]\u7c7b\u578b\u8f6c\u4e3aObject[]\u7c7b\u578b\u7f62\u4e86\u3002<br \/>\n\u4f46\u662f\u6ce8\u610f\uff0c\u867d\u7136\u8fd4\u56de\u7684\u5f15\u7528\u4e3aObject[]\uff0c\u4f46\u5b9e\u9645\u7684\u7c7b\u578b\u8fd8\u662fString[],\u5f53\u4f60\u5f80\u4e00\u4e2a\u5f15\u7528\u7c7b\u578b\u548c\u5b9e\u9645\u7c7b\u578b\u4e0d\u5339\u914d\u7684\u5bf9\u8c61\u4e2d\u6dfb\u52a0\u5143\u7d20\u65f6\uff0c\u5c31\u662f\u62a5\u9519\u3002<br \/>\n\u5177\u4f53\u5927\u5bb6\u53ef\u4ee5\u53c2\u8003Java\u5411\u4e0a\u8f6c\u578b\u548c\u5411\u4e0b\u8f6c\u578b\u7684\u76f8\u5173\u77e5\u8bc6\u70b9\u3002<\/p>\n<p>\u5173\u4e8eArrays\u4e2d\u7684\u5751\u5c31\u8bf4\u5230\u8fd9\u91cc\uff0c\u6709\u8865\u5145\u7684\u6b22\u8fce\u7559\u8a00\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8f6c\u8f7d\u81ea\uff1ahttps:\/\/www.cnblogs.com\/wang-meng\/p\/f1532cf23ce049c <a href='http:\/\/prayerlaputa.com\/?p=607' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/607"}],"collection":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=607"}],"version-history":[{"count":1,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/607\/revisions"}],"predecessor-version":[{"id":608,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/607\/revisions\/608"}],"wp:attachment":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=607"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}