{"id":1262,"date":"2024-10-19T21:37:49","date_gmt":"2024-10-19T13:37:49","guid":{"rendered":"https:\/\/note.ui11.cc\/?p=1262"},"modified":"2024-10-19T21:37:50","modified_gmt":"2024-10-19T13:37:50","slug":"collection%e9%9b%86%e5%90%88","status":"publish","type":"post","link":"https:\/\/note.ui11.cc\/index.php\/2024\/10\/19\/collection%e9%9b%86%e5%90%88\/","title":{"rendered":"Collection\u96c6\u5408"},"content":{"rendered":"\n
\"\"<\/div><\/figure>\n\n\n\n

\u8d85\u8be6\u7ec6\u96c6\u5408\u67b6\u6784\u56fe<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

\u9996\u5148\u662fcollection\u96c6\u5408\uff08\u5355\u5217\u96c6\u5408\uff09\uff1a<\/p>\n\n\n\n

\u9996\u5148\u662flist\u96c6\u5408\uff1a<\/p>\n\n\n\n

list\u662f\u6709\u5e8f\u96c6\u5408\uff0c\u7528\u6237\u53ef\u4ee5\u7cbe\u51c6\u770b\u5230\u6bcf\u4e2a\u96c6\u5408\u7684\u63d2\u5165\u4f4d\u7f6e\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u6574\u6570\u7d22\u5f15\u8bbf\u95ee\u5143\u7d20\uff0c\u5e76\u641c\u7d22\u5217\u8868\u4e2d\u7684\u5143\u7d20<\/p>\n\n\n\n

list\u96c6\u5408\u7279\u70b9\uff1a\u6709\u5e8f\uff0c\u5141\u8bb8\u91cd\u590d\u7684\u5143\u7d20\uff0c\u5143\u7d20\u5b58\u53d6\u6709\u5e8f<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

list\u96c6\u5408\u7684\u8fed\u4ee3\u5668\uff1a<\/p>\n\n\n\n

\u901a\u8fc7list\u96c6\u5408\u7684Listlterrator\uff08\uff09\u65b9\u6cd5\u5f97\u5230\uff0c\u6240\u4ee5\u8bf4\u4ed6\u662f\u96c6\u5408list\u7279\u6709\u7684\u8fed\u4ee3\u5668<\/p>\n\n\n\n

\u7528\u4e8e\u5141\u8bb8\u7a0b\u5e8f\u5458\u6cbf\u4efb\u4e00\u65b9\u5411\u904d\u5386\u7684\u5217\u8868\u8fed\u4ee3\u5668\uff0c\u5728\u8fed\u4ee3\u671f\u95f4\u4fee\u6539\u5217\u8868\uff0c\u5e76\u83b7\u53d6\u5217\u8868\u4e2d\u8fed\u4ee3\u5668\u7684\u5f53\u524d\u4f4d\u7f6e<\/p>\n\n\n\n

List<String> list = new ArrayList<String>(); \/\/\u521b\u5efa\u96c6\u5408\u5bf9\u8c61\nlist.add(\"hello\"); \/\/\u6dfb\u52a0\u5143\u7d20\nlist.add(\"world\");\n\nListIterator<String> lit = list.listIterator(); \/\/\u83b7\u53d6\u5217\u8868\u8fed\u4ee3\u5668\nwhile (lit.hasNext()) {\n    String s = lit.next();\n    if(s.equals(\"world\"))  lit.add(\"javaee\"); \n}\n<\/code><\/pre>\n\n\n\n
ArrayList:\u5e95\u5c42\u662f\u6570\u7ec4\u7ed3\u6784\u5b9e\u73b0\uff0c\u67e5\u8be2\u5feb\uff0c\u589e\u5220\u6162\uff08\u52a8\u6001\u6570\u7ec4\uff09<\/p>\n\n\n\n
\u6cdb\u578b\u7684\u4f7f\u7528\uff1a\u7ea6\u675f\u96c6\u5408\u4e2d\u7684\u5b58\u50a8\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
\u521b\u5efa\u96c6\u5408\u5bf9\u8c61\uff1a<\/p>\n\n\n\n
\/\/\u521b\u5efaArrayList\u96c6\u5408\u5bf9\u8c61\nArrayList<Student> array = new ArrayList<Student>();\nStudent s1 = new Student(\"\u6797\u9752\u971e\", 30);\nStudent s2 = new Student(\"\u5f20\u66fc\u7389\", 35);\narray.add(s1);\narray.add(s2);\n\n\/\/\u8fed\u4ee3\u5668\uff1a\u96c6\u5408\u7279\u6709\u7684\u904d\u5386\u65b9\u5f0f\nIterator<Student> it = array.iterator();\nwhile (it.hasNext()) {\n    Student s = it.next();\n    System.out.println(s.getName() + \",\" + s.getAge());\n}\n\n\/\/\u666e\u901afor\uff1a\u5e26\u6709\u7d22\u5f15\u7684\u904d\u5386\u65b9\u5f0f\nfor(int i=0; i<array.size(); i++) {\n    Student s = array.get(i);\n    System.out.println(s.getName() + \",\" + s.getAge());\n}\n\n\/\/\u589e\u5f3afor\uff1a\u6700\u65b9\u4fbf\u7684\u904d\u5386\u65b9\u5f0f\nfor(Student s : array) {\n    System.out.println(s.getName() + \",\" + s.getAge());\n}\n<\/code><\/pre>\n\n\n\n
Linkedlist:<\/p>\n\n\n\n
LinkedList\uff1a\u5e95\u5c42\u662f\u94fe\u8868\u7ed3\u6784<\/strong>\u5b9e\u73b0\uff0c\u67e5\u8be2\u6162\uff0c\u589e\u5220\u5feb<\/strong>\uff08\u5e95\u5c42\uff1a\u53cc\u5411\u94fe\u8868\uff09<\/p>\n\n\n\n
\u3001Set \u65e0\u5e8f\u96c6\u5408:<\/p>\n\n\n\n
Set\u96c6\u5408\u7684\u7279\u70b9\uff1a\u5143\u7d20\u5b58\u53d6\u65e0\u5e8f\u3001\u6ca1\u6709\u7d22\u5f15(\u53ea\u80fd\u8fed\u4ee3\u5668<\/strong>\/\u589e\u5f3afor\u5faa\u73af<\/strong>\u904d\u5386)\u3001\u4e0d\u80fd\u5b58\u50a8\u91cd\u590d\u5143\u7d20<\/p>\n\n\n\n
\u54c8\u5e0c\u503c\uff1a<\/p>\n\n\n\n
Hash\u503c\uff1a\u662fJDK\u6839\u636e\u5bf9\u8c61\u7684\u5730\u5740\/\u5b57\u7b26\u4e32\/\u6570\u5b57\u7b97\u51fa\u6765\u7684int\u7c7b\u578b\u7684\u6570\u503c
\u5982\u4f55\u83b7\u53d6\u54c8\u5e0c\u503c\uff1aObject\u7c7b\u4e2d\u7684public int hashCode()\uff1a\u8fd4\u56de\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u503c
\u54c8\u5e0c\u503c\u7684\u7279\u70b9
\u540c\u4e00\u4e2a\u5bf9\u8c61\u591a\u6b21\u8c03\u7528hashCode()\u65b9\u6cd5\u8fd4\u56de\u7684\u54c8\u5e0c\u503c\u662f\u76f8\u540c\u7684
\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e0d\u540c\u5bf9\u8c61\u7684\u54c8\u5e0c\u503c\u662f\u4e0d\u540c\u7684\u3002\u800c\u91cd\u5199hashCode()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8ba9\u4e0d\u540c\u5bf9\u8c61\u7684\u54c8\u5e0c\u503c\u76f8\u540c
<\/p>\n\n\n\n
hashSet:<\/p>\n\n\n\n
    \n
  • \u5e95\u5c42\u6570\u636e\u7ed3\u6784\u662f\u54c8\u5e0c\u8868<\/li>\n\n\n\n
  • \u5bf9\u96c6\u5408\u7684\u8fed\u4ee3\u987a\u5e8f\u4e0d\u4f5c\u4efb\u4f55\u4fdd\u8bc1\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e0d\u4fdd\u8bc1\u5b58\u50a8\u548c\u53d6\u51fa\u7684\u5143\u7d20\u987a\u5e8f\u4e00\u81f4<\/li>\n\n\n\n
  • \u6ca1\u6709\u5e26\u7d22\u5f15\u7684\u65b9\u6cd5\uff0c\u6240\u4ee5\u4e0d\u80fd\u4f7f\u7528\u666e\u901afor\u5faa\u73af\u904d\u5386<\/li>\n\n\n\n
  • \u7531\u4e8e\u662fSet\u96c6\u5408\uff0c\u6240\u4ee5\u662f\u4e0d\u5305\u542b\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408<\/li>\n<\/ul>\n\n\n\n
    TreeSet<\/p>\n\n\n\n
    TreeSet\uff1a\u5143\u7d20\u6709\u5e8f\uff0c\u53ef\u4ee5\u6309\u7167\u4e00\u5b9a\u7684\u89c4\u5219\u8fdb\u884c\u6392\u5e8f\uff0c\u5177\u4f53\u6392\u5e8f\u65b9\u5f0f\u53d6\u51b3\u4e8e\u6784\u9020\u65b9\u6cd5<\/p>\n\n\n\n
    Map\u96c6\u5408\uff1a<\/strong><\/p>\n\n\n\n
    Map\u96c6\u5408\u7279\u70b9 \uff1akey:value\u5bf9\u6620\u5c04\u5173\u7cfb\u3001\u952e\u4e0d\u80fd\u91cd\u590d\uff0c\u503c\u53ef\u4ee5\u91cd\u590d\u3001\u5143\u7d20\u5b58\u53d6\u65e0\u5e8f<\/p>\n\n\n\n
    \"\"<\/div><\/figure>\n\n\n\n
    HashMap \u2b50
    :::tips
    \u6982\u8ff0\uff1a<\/strong>HashMap\u4f7f\u7528\u54c8\u5e0c\u8868\u6765\u5b58\u50a8\u6570\u636e\uff0c\u901a\u8fc7\u8ba1\u7b97\u952e\u7684\u54c8\u5e0c\u503c\u6765\u786e\u5b9a\u5176\u5728\u5185\u90e8\u6570\u7ec4\u4e2d\u7684\u5b58\u50a8\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
    HashMap\u7684\u952e\u662f\u552f\u4e00\u7684\uff0c\u5982\u679c\u63d2\u5165\u76f8\u540c\u7684\u952e\uff0c\u65b0\u7684\u503c\u4f1a\u8986\u76d6\u65e7\u7684\u503c\u3002\u5b83\u4e0d\u4fdd\u8bc1\u952e\u503c\u5bf9\u7684\u987a\u5e8f\uff0c\u4e5f\u4e0d\u4fdd\u8bc1\u63d2\u5165\u987a\u5e8f\u548c\u8bbf\u95ee\u987a\u5e8f\u4e00\u81f4\u3002
    \u4f7f\u7528HashMap\u53ef\u4ee5\u5feb\u901f\u5730\u63d2\u5165\u3001\u83b7\u53d6\u3001\u66f4\u65b0\u548c\u5220\u9664\u952e\u503c\u5bf9\uff0c\u5176\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002\u5b83\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff0c\u9700\u8981\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4f7f\u7528\u53ef\u4ee5\u4f7f\u7528ConcurrentHashMap\u3002
    HashMap\u5728\u904d\u5386\u65f6\uff0c\u4e0d\u4fdd\u8bc1\u5143\u7d20\u7684\u987a\u5e8f\uff0c\u5982\u679c\u9700\u8981\u6709\u5e8f\u904d\u5386\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528LinkedHashMap\u3002\u6b64\u5916\uff0c\u7531\u4e8e\u54c8\u5e0c\u78b0\u649e\u7684\u5b58\u5728\uff0c\u5f53\u952e\u7684\u54c8\u5e0c\u503c\u76f8\u540c\u65f6\uff0c\u4f1a\u4f7f\u7528\u94fe\u8868\u6216\u7ea2\u9ed1\u6811\u7b49\u6570\u636e\u7ed3\u6784\u6765\u89e3\u51b3\u51b2\u7a81\uff0c\u4ee5\u4fdd\u8bc1\u6027\u80fd\u3002<\/p>\n\n\n\n
      \n
    • \u589e\u52a0\uff08put\uff09\u64cd\u4f5c\uff1a\u6dfb\u52a0\u952e\u503c\u5bf9\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002<\/li>\n\n\n\n
    • \u5220\u9664\uff08remove\uff09\u64cd\u4f5c\uff1a\u5220\u9664\u952e\u503c\u5bf9\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002<\/li>\n\n\n\n
    • \u4fee\u6539\uff08put\uff09\u64cd\u4f5c\uff1a\u4fee\u6539\u952e\u503c\u5bf9\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002<\/li>\n\n\n\n
    • \u67e5\u627e\uff08get\uff09\u64cd\u4f5c\uff1a\u6839\u636e\u952e\u83b7\u53d6\u503c\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)\u3002<\/li>\n<\/ul>\n\n\n\n
                         <\/code><\/pre>\n\n\n\n
      <\/p>\n","protected":false},"excerpt":{"rendered":"
      \u8d85\u8be6\u7ec6\u96c6\u5408\u67b6\u6784\u56fe \u9996\u5148\u662fcollection\u96c6\u5408\uff08\u5355\u5217\u96c6\u5408\uff09\uff1a \u9996\u5148\u662flist\u96c6\u5408\uff1a list\u662f\u6709\u5e8f\u96c6\u5408\uff0c\u7528\u6237 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1262","post","type-post","status-publish","format-standard","hentry","category-javase"],"_links":{"self":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/comments?post=1262"}],"version-history":[{"count":1,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1262\/revisions"}],"predecessor-version":[{"id":1269,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1262\/revisions\/1269"}],"wp:attachment":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/media?parent=1262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/categories?post=1262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/tags?post=1262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}