{"id":1563,"date":"2020-11-14T09:44:27","date_gmt":"2020-11-14T01:44:27","guid":{"rendered":"https:\/\/www.yusian.com\/blog\/?p=1563"},"modified":"2020-11-14T09:44:27","modified_gmt":"2020-11-14T01:44:27","slug":"java%e4%b8%ad%e9%9b%86%e5%90%88%e7%9a%84%e5%9f%ba%e6%9c%ac%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/java\/2020\/11\/14\/0944271563.html","title":{"rendered":"Java\u4e2d\u96c6\u5408\u7684\u57fa\u672c\u4f7f\u7528"},"content":{"rendered":"<ol>\n<li>\u6570\u7ec4\u4e0e\u96c6\u5408\u7684\u57fa\u672c\u533a\u522b\uff1a<\/li>\n<\/ol>\n<ul>\n<li>\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u800c\u96c6\u5408\u7684\u957f\u5ea6\u662f\u53ef\u53d8\u7684\uff1b<\/li>\n<li>\u6570\u7ec4\u53ef\u4ee5\u5b58\u653e\u4efb\u610f\u6570\u636e\u7c7b\u578b\uff0c\u800c\u96c6\u5408\u4e0d\u80fd\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff1b<\/li>\n<\/ul>\n<ol start=\"2\">\n<li>\u96c6\u5408(Collection)\u5206\u4e3a\u4e24\u5927\u63a5\u53e3\u7c7b\uff1a<code>List<\/code>\u4e0e<code>Set<\/code><\/li>\n<\/ol>\n<ul>\n<li><strong>List<\/strong>\u7684\u5b9e\u73b0\u7c7b\u6709<code>ArrayList<\/code>\u3001<code>LinkedList<\/code>\u3001<code>Vector<\/code>\uff1b<\/li>\n<li><strong>Set<\/strong>\u7684\u5b9e\u73b0\u7c7b\u6709<code>HashSet<\/code>(<code>LinkedHashSet<\/code>)\u3001<code>TreeSet<\/code><\/li>\n<\/ul>\n<ol start=\"3\">\n<li><strong><code>Collection<\/code> &#8211;> <code>AbstractCollection<\/code> &#8211;> <code>AbstractList<\/code> &#8211;> <code>ArrayList<\/code><\/strong>\uff0c<code>toString<\/code>\u65b9\u6cd5\u5728<code>AbstractCollection<\/code>\u4e2d\u88ab\u5b9e\u73b0<\/p>\n<\/li>\n<li>\n<p>Iterator\u8fed\u4ee3\u5668\u7684\u4f7f\u7528<\/p>\n<pre><code class=\"language-java line-numbers\">ArrayList&lt;Object&gt; array = new ArrayList&lt;&gt;();\narray.add(1);\narray.add(2);\narray.add(3);\n\/\/ \u4f7f\u7528\u8fed\u4ee3\u8fdb\u884c\u96c6\u5408\u904d\u5386\nIterator iterator = array.iterator();\nwhile(iterator.hasNext()) {\n   Object next = iterator.next();\n   System.out.println(next);\n}\nSystem.out.println(\"-----------------------\");\n\/\/ for\u5faa\u73af\u5b9e\u73b0\nfor (Iterator it = array.iterator(); it.hasNext(); ) {\n   System.out.println(it.next());\n}\nSystem.out.println(\"------------------------\");\n\/\/ \u589e\u52a0for\uff0c\u6240\u4ee5\u5b9e\u73b0Iterable\u63a5\u53e3\u7684\u7c7b\u90fd\u53ef\u4ee5\u4f7f\u7528\u589e\u5f3afor\u8fdb\u884c\u904d\u5386\uff0c\u5e95\u5c42\u5b9e\u73b0\u901a\u8fc7iterator\nfor (Object obj: array) {\n   System.out.println(obj);\n}\n<\/code><\/pre>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u7ec4\u4e0e\u96c6\u5408\u7684\u57fa\u672c\u533a\u522b\uff1a \u6570\u7ec4\u7684\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u800c\u96c6\u5408\u7684\u957f\u5ea6\u662f\u53ef\u53d8\u7684\uff1b \u6570\u7ec4\u53ef\u4ee5\u5b58\u653e\u4efb\u610f\u6570\u636e\u7c7b\u578b\uff0c\u800c\u96c6\u5408\u4e0d\u80fd\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff1b \u96c6\u5408(Collection)\u5206\u4e3a\u4e24\u5927\u63a5\u53e3\u7c7b\uff1aList\u4e0eSet List\u7684\u5b9e\u73b0\u7c7b\u6709ArrayList\u3001LinkedList\u3001Vector\uff1b Set\u7684\u5b9e\u73b0\u7c7b\u6709HashSet(LinkedHashSet)\u3001TreeSet Collection &#8211;> AbstractCollection &#8211;> AbstractList &#8211;> ArrayList\uff0ctoString\u65b9\u6cd5\u5728AbstractCollection\u4e2d\u88ab\u5b9e\u73b0 Iterator\u8fed\u4ee3\u5668\u7684\u4f7f\u7528 ArrayList&lt;Object&gt; array = new ArrayList&lt;&gt;(); array.add(1); array.add(2); array.add(3); \/\/ \u4f7f\u7528\u8fed\u4ee3\u8fdb\u884c\u96c6\u5408\u904d\u5386 Iterator iterator = array.iterator(); while(iterator.hasNext()) { Object next = iterator.next(); System.out.println(next); } System.out.println(&#8220;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#8220;); \/\/ for\u5faa\u73af\u5b9e\u73b0 for (Iterator it = array.iterator(); it.hasNext(); ) { System.out.println(it.next()); } System.out.println(&#8220;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8220;); \/\/ \u589e\u52a0for\uff0c\u6240\u4ee5\u5b9e\u73b0Iterable\u63a5\u53e3\u7684\u7c7b\u90fd\u53ef\u4ee5\u4f7f\u7528\u589e\u5f3afor\u8fdb\u884c\u904d\u5386\uff0c\u5e95\u5c42\u5b9e\u73b0\u901a\u8fc7iterator for (Object obj: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[248,249,247,34,250],"class_list":["post-1563","post","type-post","status-publish","format-standard","hentry","category-java","tag-array","tag-arraylist","tag-collection","tag-java","tag-set"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1563","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1563"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1563\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1563"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1563"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1563"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}