{"id":47,"date":"2017-08-27T16:44:11","date_gmt":"2017-08-27T08:44:11","guid":{"rendered":"http:\/\/sgvps.hyh0.com\/?p=47"},"modified":"2017-10-30T23:37:03","modified_gmt":"2017-10-30T15:37:03","slug":"java%e4%b8%ad%e7%9a%84%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%84-0-%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/www.hyh0.com\/?p=47","title":{"rendered":"Java\u4e2d\u7684\u6570\u636e\u7ed3\u6784 0.\u63a5\u53e3\u4ecb\u7ecd"},"content":{"rendered":"

0. Queue\u63a5\u53e3<\/strong><\/h2>\n

\u961f\u5217\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u7ebf\u6027\u8868\uff0c\u5b83\u53ea\u5141\u8bb8\u5728\u8868\u7684\u524d\u7aef\uff08front\uff09\u8fdb\u884c\u5220\u9664\u64cd\u4f5c\uff0c\u800c\u5728\u8868\u7684\u540e\u7aef\uff08rear\uff09\u8fdb\u884c\u63d2\u5165\u64cd\u4f5c\u3002\u8fdb\u884c\u63d2\u5165\u64cd\u4f5c\u7684\u7aef\u79f0\u4e3a\u961f\u5c3e\uff0c\u8fdb\u884c\u5220\u9664\u64cd\u4f5c\u7684\u7aef\u79f0\u4e3a\u961f\u5934\u3002\u961f\u5217\u4e2d\u6ca1\u6709\u5143\u7d20\u65f6\uff0c\u79f0\u4e3a\u7a7a\u961f\u5217\u3002<\/p>\n

<\/p>\n

\u5728\u961f\u5217\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u6700\u5148\u63d2\u5165\u7684\u5143\u7d20\u5c06\u662f\u6700\u5148\u88ab\u5220\u9664\u7684\u5143\u7d20\uff1b\u53cd\u4e4b\u6700\u540e\u63d2\u5165\u7684\u5143\u7d20\u5c06\u662f\u6700\u540e\u88ab\u5220\u9664\u7684\u5143\u7d20\uff0c\u56e0\u6b64\u961f\u5217\u53c8\u79f0\u4e3a\u201c\u5148\u8fdb\u5148\u51fa\u201d\uff08FIFO\u2014first in first out\uff09\u7684\u7ebf\u6027\u8868\u3002<\/p>\n

LinkedList\u7c7b\u5b9e\u73b0\u4e86Queue\u63a5\u53e3<\/p>\n

Queue\u63a5\u53e3\u4e2d\u4e3b\u8981\u6709\u4ee5\u4e0b\u65b9\u6cd5<\/p>\n\n\n\n\n\n\n
<\/td>\nThrows exception<\/em><\/td>\nReturns special value<\/em><\/td>\n<\/tr>\n
Insert<\/b><\/td>\nadd(e)<\/code><\/a><\/td>\noffer(e)<\/code><\/a><\/td>\n<\/tr>\n
Remove<\/b><\/td>\nremove()<\/code><\/a><\/td>\npoll()<\/code><\/a><\/td>\n<\/tr>\n
Examine<\/b><\/td>\nelement()<\/code><\/a><\/td>\npeek()<\/code><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

element\u548cpeek\u8fd4\u56de\u524d\u7aef\u800c\u4e0d\u5220\u9664<\/p>\n

\u53ef\u4ee5\u901a\u8fc7\u7ee7\u627fAbstractQueue\u6765\u5b9e\u73b0Queue\u4e2d\u5927\u591a\u6570\u65b9\u6cd5<\/p>\n

Queue\u63a5\u53e3\u7684\u4f7f\u7528\u793a\u4f8b<\/p>\n

\r\npackage com.hyh0.learning.collections;\r\n\r\nimport java.util.LinkedList;\r\nimport java.util.Queue;\r\n\r\npublic class GeneralTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tQueue&lt;String&gt; list = new LinkedList&lt;&gt;();\r\n\t\tlist.offer("hello");\r\n\t\tlist.offer(" ");\r\n\t\tlist.offer("world");\r\n\t\t\r\n\t\twhile(list.peek() != null) {\r\n\t\t\tSystem.out.print(list.poll());\r\n\t\t}\r\n\t\tSystem.out.println();\r\n\t}\r\n\r\n}\r\n<\/pre>\n
1. Iterator\u63a5\u53e3<\/strong><\/h2>\n
Iterator\u63a5\u53e3\u6709\u4e09\u4e2a\u65b9\u6cd5<\/p>\n
\r\npublic interface Iterator&lt;E&gt;;\r\n{\r\n    E next();\r\n    boolean hasNext();\r\n    default void remove(); \r\n}\r\n<\/pre>\n
PS: \u8fd9\u91cc\u7684remove()\u4f7f\u7528\u4e86jdk1.8\u7684default\u5173\u952e\u5b57\u5b9a\u4e49\u4e86\u9ed8\u8ba4\u5b9e\u73b0\uff0c\u5982\u679c\u4e0d\u91cd\u8f7d\u5c31\u4f7f\u7528\u4f1a\u629b\u51faUnsupportedOperationException\u5f02\u5e38\uff0c\u6240\u4ee5\u5b9e\u73b0\u63a5\u53e3\u65f6\u5e94\u8be5\u91cd\u8f7d\u8fd9\u4e2a\u65b9\u6cd5(?)<\/p>\n
next\u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e0b\u4e00\u4e2a\u5143\u7d20<\/p>\n
hasNext\u8fd4\u56de\u662f\u5426\u6709\u4e0b\u4e00\u4e2a\u5143\u7d20<\/p>\n
remove\u4f1a\u5220\u9664\u4e0a\u4e00\u6b21next()\u8fd4\u56de\u7684\u5143\u7d20\uff08\u6bcf\u4e00\u6b21\u4f7f\u7528remove\u524d\u90fd\u5fc5\u987b\u8c03\u7528\u8fc7next\u65b9\u6cd5\uff09<\/p>\n
\u7528Iterator\u53ef\u4ee5\u904d\u5386\u5143\u7d20<\/p>\n
2. Iterable\u63a5\u53e3<\/strong><\/h2>\n
Iterable\u63a5\u53e3\u6709\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5176\u8fd4\u56de\u4e00\u4e2aIterator<\/p>\n
\r\npublic interface Iterable&lt;E&gt;;\r\n{\r\n    Iterator&lt;E&gt; iterator();\r\n}\r\n<\/pre>\n
\u5b9e\u73b0\u4e86Iterable\u63a5\u53e3\u7684\u5bf9\u8c61\u90fd\u53ef\u4ee5\u4f7f\u7528 for – each\u00a0\u5faa\u73af<\/p>\n
3. ListIterator\u63a5\u53e3<\/strong><\/h2>\n
ListIterator\u7ee7\u627f\u81eaIterator<\/p>\n
\u9664\u4e86Iterator\u4e2d\u7684\u65b9\u6cd5\uff0cListIterator\u63a5\u53e3\u4e2d\u8fd8\u6709add\u65b9\u6cd5\u5728\u5f53\u524d\u4f4d\u7f6e\u540e\u6dfb\u52a0\u5143\u7d20<\/p>\n
\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u6709previous\u4e0ehasPrevious\u65b9\u6cd5<\/p>\n
\u4f7f\u7528add\u5728\u539f\u6709LinkedList\u4e2d\u95f4\u63d2\u5165” “\u7684\u793a\u4f8b<\/p>\n
\r\npublic static void main(String[] args) {\r\n    LinkedList&lt;String&gt; list = new LinkedList&lt;&gt;();\r\n    list.add("hello");\r\n    list.add("world");\r\n\r\n    ListIterator&lt;String&gt; it = list.listIterator();\r\n    it.next();\r\n    it.add(" ");\r\n\r\n    it.previous(); \/\/\u6dfb\u52a0\u4e86\u5143\u7d20\u540e\u8fed\u4ee3\u5668\u540e\u79fb\r\n    it.previous(); \/\/\u6240\u4ee5\u9700\u8981\u540e\u79fb\u4e24\u6b21\r\n\r\n    while (it.hasNext()) {\r\n        System.out.print(it.next());\r\n    }\r\n    System.out.println();\r\n}\r\n<\/pre>\n
4. Deque\u63a5\u53e3<\/strong><\/h2>\n
Deque\u63a5\u53e3\u4e0eQueue\u63a5\u53e3\u7c7b\u4f3c\uff0c\u4f46\u4e0d\u540c\u4e8eQueue\u53ea\u80fd\u5728\u5c3e\u90e8\u6dfb\u52a0\u5934\u90e8\u8bfb\u53d6\uff0cDeque\u53ef\u4ee5\u9009\u62e9\u5728\u5934\u90e8\u6216\u8005\u5c3e\u90e8\u8fdb\u884c\u64cd\u4f5c<\/p>\n
ArrayDeque\u548cLinkedList\u5b9e\u73b0\u4e86Deque\u63a5\u53e3<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
0. Queue\u63a5\u53e3 \u961f\u5217\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u7ebf\u6027\u8868\uff0c\u5b83\u53ea\u5141\u8bb8\u5728\u8868\u7684\u524d\u7aef\uff08front\uff09\u8fdb\u884c\u5220\u9664\u64cd\u4f5c\uff0c\u800c\u5728\u8868\u7684\u540e\u7aef\uff08re … \u7ee7\u7eed\u9605\u8bfbJava\u4e2d\u7684\u6570\u636e\u7ed3\u6784 0.\u63a5\u53e3\u4ecb\u7ecd<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts\/47"}],"collection":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=47"}],"version-history":[{"count":25,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts\/47\/revisions"}],"predecessor-version":[{"id":107,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts\/47\/revisions\/107"}],"wp:attachment":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=47"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=47"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=47"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}