{"id":37609,"date":"2024-11-26T16:02:53","date_gmt":"2024-11-26T08:02:53","guid":{"rendered":"https:\/\/fwq.ai\/blog\/37609\/"},"modified":"2024-11-26T16:02:53","modified_gmt":"2024-11-26T08:02:53","slug":"java%e5%8a%a8%e6%80%81%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e5%85%a8%e9%83%a8%e8%be%93%e5%87%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/37609\/","title":{"rendered":"java\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u5168\u90e8\u8f93\u51fa"},"content":{"rendered":"<blockquote><p>\n  java \u52a8\u6001\u6570\u7ec4\uff08arraylist\uff09\u7684\u8f93\u51fa\u65b9\u6cd5\uff1a\u4f7f\u7528 tostring() \u65b9\u6cd5\u5c06 arraylist \u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u5e76\u8f93\u51fa\u3002\u4f7f\u7528\u589e\u5f3a for \u5faa\u73af\u904d\u5386\u5e76\u8f93\u51fa\u6bcf\u4e2a\u5143\u7d20\u3002\u4f7f\u7528 iterator \u8fed\u4ee3\u5e76\u8f93\u51fa\u6bcf\u4e2a\u5143\u7d20\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111307455169464.jpg\" class=\"aligncenter\" title=\"java\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u5168\u90e8\u8f93\u51fa\u63d2\u56fe\" alt=\"java\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u5168\u90e8\u8f93\u51fa\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5168\u90e8\u8f93\u51fa Java \u52a8\u6001\u6570\u7ec4\uff1f<\/strong><\/p>\n<p>Java \u4e2d\u7684\u52a8\u6001\u6570\u7ec4\u662f ArrayList\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u6309\u9700\u6dfb\u52a0\u548c\u5220\u9664\u5143\u7d20\u3002\u8981\u5168\u90e8\u8f93\u51fa\u52a8\u6001\u6570\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<p><strong>\u4f7f\u7528 toString() \u65b9\u6cd5<\/strong><\/p>\n<p>toString() \u65b9\u6cd5\u5c06 ArrayList \u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\uff0c\u8be5\u5b57\u7b26\u4e32\u5305\u62ec\u6570\u7ec4\u4e2d\u6240\u6709\u5143\u7d20\u7684\u9017\u53f7\u5206\u9694\u5217\u8868\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 System.out.println() \u65b9\u6cd5\u6253\u5370\u6b64\u5b57\u7b26\u4e32\u3002<\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<pre>ArrayList&lt;String&gt; names = new ArrayList&lt;&gt;();\nnames.add(\"John\");\nnames.add(\"Mary\");\nnames.add(\"Bob\");\n\nSystem.out.println(names.toString()); \/\/ \u8f93\u51fa\uff1a\"[John, Mary, Bob]\"<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528\u589e\u5f3a for \u5faa\u73af<\/strong><\/p>\n<p>\u589e\u5f3a for \u5faa\u73af\u662f\u4e00\u79cd\u904d\u5386\u96c6\u5408\u7684\u7b80\u4fbf\u65b9\u6cd5\u3002\u5b83\u4f1a\u81ea\u52a8\u8fed\u4ee3\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u6307\u5b9a\u53d8\u91cf\u3002<\/p>\n<pre>ArrayList&lt;Integer&gt; numbers = new ArrayList&lt;&gt;();\nnumbers.add(1);\nnumbers.add(2);\nnumbers.add(3);\n\nfor (int number : numbers) {\n    System.out.println(number); \/\/ \u8f93\u51fa\uff1a1 2 3\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u4f7f\u7528\u8fed\u4ee3\u5668<\/strong><\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Iterator \u904d\u5386 ArrayList\u3002\u8fed\u4ee3\u5668\u5141\u8bb8\u6211\u4eec\u8bbf\u95ee\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5bf9\u5176\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<pre>ArrayList&lt;Double&gt; values = new ArrayList&lt;&gt;();\nvalues.add(1.5);\nvalues.add(2.5);\nvalues.add(3.5);\n\nIterator&lt;Double&gt; iterator = values.iterator();\nwhile (iterator.hasNext()) {\n    System.out.println(iterator.next()); \/\/ \u8f93\u51fa\uff1a1.5 2.5 3.5\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u52a8\u6001\u6570\u7ec4\u600e\u4e48\u5168\u90e8\u8f93\u51fa\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>java \u52a8\u6001\u6570\u7ec4\uff08arraylist\uff09\u7684\u8f93\u51fa\u65b9\u6cd5\uff1a\u4f7f\u7528 tostring() \u65b9\u6cd5\u5c06 arraylist \u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u5e76\u8f93\u51fa\u3002\u4f7f\u7528\u589e\u5f3a for \u5faa\u73af\u904d\u5386\u5e76\u8f93\u51fa\u6bcf\u4e2a\u5143\u7d20\u3002\u4f7f\u7528 iterator \u8fed\u4ee3\u5e76\u8f93\u51fa\u6bcf\u4e2a\u5143\u7d20\u3002 \u5982\u4f55\u5168\u90e8\u8f93\u51fa Java \u52a8\u6001\u6570\u7ec4\uff1f Java \u4e2d\u7684\u52a8\u6001\u6570\u7ec4\u662f ArrayList\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u6309\u9700\u6dfb\u52a0\u548c\u5220\u9664\u5143\u7d20\u3002\u8981\u5168\u90e8\u8f93\u51fa\u52a8\u6001\u6570\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a \u4f7f\u7528 toString() \u65b9\u6cd5 toString() \u65b9\u6cd5\u5c06 ArrayList \u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\uff0c\u8be5\u5b57\u7b26\u4e32\u5305\u62ec\u6570\u7ec4\u4e2d\u6240\u6709\u5143\u7d20\u7684\u9017\u53f7\u5206\u9694\u5217\u8868\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 System.out.println() \u65b9\u6cd5\u6253\u5370\u6b64\u5b57\u7b26\u4e32\u3002 \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b ArrayList&lt;String&gt; names = new ArrayList&lt;&gt;(); names.add(&#8220;John&#8221;); names.add(&#8220;Mary&#8221;); names.add(&#8220;Bob&#8221;); System.out.println(names.toString()); \/\/ \u8f93\u51fa\uff1a&#8221;[John, Mary, Bob]&#8221; \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528\u589e\u5f3a for \u5faa\u73af \u589e\u5f3a for \u5faa\u73af\u662f\u4e00\u79cd\u904d\u5386\u96c6\u5408\u7684\u7b80\u4fbf\u65b9\u6cd5\u3002\u5b83\u4f1a\u81ea\u52a8\u8fed\u4ee3\u96c6\u5408\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u5c06\u5176\u8d4b\u503c\u7ed9\u6307\u5b9a\u53d8\u91cf\u3002 ArrayList&lt;Integer&gt; numbers = new ArrayList&lt;&gt;(); numbers.add(1); numbers.add(2); numbers.add(3); for [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-37609","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=37609"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/37609\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=37609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=37609"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=37609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}