{"id":531,"date":"2019-08-22T08:44:21","date_gmt":"2019-08-22T00:44:21","guid":{"rendered":"http:\/\/47.101.202.111\/?p=531"},"modified":"2019-12-16T18:26:27","modified_gmt":"2019-12-16T10:26:27","slug":"java%e7%89%b9%e6%80%a7%e9%9b%86%e5%90%88%e7%b1%bb%ef%bc%9acollection%ef%bc%8clist%ef%bc%8cset%ef%bc%8cmap","status":"publish","type":"post","link":"http:\/\/139.196.114.170\/?p=531","title":{"rendered":"[java\u7279\u6027]\u96c6\u5408\u7c7b\uff1aCollection\uff0cList\uff0cSet\uff0cMap"},"content":{"rendered":"

\u7c7b\u96c6\u4e94\u5927\u6838\u5fc3\u63a5\u53e3Collection\u3001List\u3001Set\u3001Map\u3001Iterable\uff0c\u5b9e\u73b0\u4e86\u57fa\u7840\u7684\u52a8\u6001\u957f\u5ea6\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5229\u7528\u6cdb\u578b\u4fdd\u5b58\u76f8\u540c\u7c7b\u578b\u6570\u636e\u907f\u514d\u5411\u4e0b\u8f6c\u578b\uff0c\u63a5\u53e3\u7684\u4f7f\u7528\u9700\u8981\u5b50\u7c7b\u5b9e\u73b0<\/p>\n

[toc]<\/p>\n

\u7c7b\u96c6\u63a5\u53e3 Java.util.Collection<\/h2>\n

\u6240\u6709\u7c7b\u96c6\u7684\u7236\u63a5\u53e3\uff0c\u4e3a\u5355\u503c\u96c6\u5408\uff1a\u6bcf\u6b21\u53ea\u80fd\u64cd\u4f5c\u4e00\u4e2a\u6570\u636e\u5bf9\u8c61<\/p>\n

\npublic interface Collection extends Iterable\n    boolean add (E e)                               \u5411\u96c6\u5408\u4fdd\u5b58\u5355\u4e2a\u6570\u636e\n    boolean addAll (Collection c)      \u5411\u96c6\u5408\u8ffd\u52a0\u4e00\u7ec4\u6570\u636e\n    void clear ()                           \u6e05\u7a7a\u96c6\u5408\uff0c\u6839\u8282\u70b9\u4e3a\u7a7a\u540c\u65f6GC\n    boolean contains (Object o)     \u67e5\u8be2\u6570\u636e\u662f\u5426\u5b58\u5728\uff0c\u9700\u8981equals()\u65b9\u6cd5\n    boolean remove (Object o)               \u6570\u636e\u5220\u9664\uff0c\u9700\u8981equals()\u65b9\u6cd5\n    int size ()                 \u96c6\u5408\u4e2d\u6570\u636e\u6570\u91cf\uff0c\u81f3\u591aInteger.MAX_VALUE\n    boolean isEmpty ()                                          \u5224\u7a7a\n    Object[] toArray ()                             \u96c6\u5408\u4f5c\u5bf9\u8c61\u6570\u7ec4\u8fd4\u56de\n    Iterator iterator ()         \u96c6\u5408\u8f6c\u4e3aiterator\u63a5\u53e3\uff0c\u7528\u4f5c\u6570\u636e\u8f93\u51fa\n<\/pre>\n
List\u63a5\u53e3 Java.util.List<\/h2>\n
List\u63a5\u53e3\u5141\u8bb8\u4fdd\u5b58\u91cd\u590d\u5143\u7d20\uff0c\u5141\u8bb8\u4fdd\u5b58null\uff0c\u542b\u6709Collection\u63a5\u53e3\u6240\u6709\u65b9\u6cd5\u5e76\u4f5c\u51fa\u6269\u5145\uff0cList\u5b50\u7c7b\u5305\u62ecArrayList\uff0cVector\uff0cLinkedList<\/p>\n
\npublic interface List extends Collection\n    E get (int index)                                   \u83b7\u53d6\u6307\u5b9a\u7d22\u5f15\u6570\u636e\n    E set (int index, E element)                        \u4fee\u6539\u6307\u5b9a\u7d22\u5f15\u6570\u636e\n    ListIterator listIterator ()             \u8fd4\u56deListIterator\u63a5\u53e3\u5bf9\u8c61\n    static  List  of (E e1, E e2, E e3)   \u8fd4\u56de\u4e00\u4e2a\u53c2\u6570\u7ec4\u6210\u7684List\n<\/pre>\n
List\u4f7f\u7528<\/h4>\n
    \/\/ \u5b50\u7c7b\u5b9e\u4f8b\u5316\n    List<String> list = new ArrayList<>();\n    \/\/ List<String> list = new LinkedList<>();\n    \/\/ List<String> list = new Vector<>();\n    \/\/ \u6dfb\u52a0\u6570\u636e\uff0c\u4e0elist\u4e2d\u5b58\u50a8\u987a\u5e8f\u4e00\u81f4\n    list.add(\"string\");\n    list.add(\"string\");\n    \/\/ \u83b7\u5f97\u7d22\u5f15\u6570\u636e\n    list.get(0);\n    \/\/ \u5224\u7a7a\n    list.isEmpty();\n    \/\/ \u957f\u5ea6\n    list.size();\n    \/\/ \u6309\u7531\u524d\u5411\u540e\u987a\u5e8f\u5220\u9664\u7b2c\u4e00\u4e2a\u5339\u914d\n    list.remove(\"string\");\n    \/\/ \u8f93\u51fa\u96c6\u5408\n    System.out.print(list);\n    \/\/ Iterable\u63a5\u53e3forEach\u8f93\u51fa\n    list.forEach((str) -> {\n        System.out.print(str);\n    });\n    \/\/ forEach\u65b9\u6cd5\u5f15\u7528\n    list.forEach(System.out::println);\n<\/code><\/pre>\n
\u5b58\u50a8\u5f15\u7528\u7c7b\u578b\u5bf9\u8c61<\/h4>\n
List\u63a5\u53e3\u4f7f\u7528remove()\u3001contains()\u65b9\u6cd5\u65f6\u9700\u8981\u8986\u5199equals()\u65b9\u6cd5<\/strong>
\nString\u7c7b\u578b\u5df2\u7ecf\u8986\u5199equals()\u65b9\u6cd5\u65e0\u9700\u91cd\u5199<\/p>\n
    class Custom{\n        int num;\n        String str;\n        public Custom(int num, String str){\n            this.num = num;\n            this.str = str;\n        }\n\n        @Override\n        public boolean equals(Object obj) {\n            if(obj == this) return true;\n            if(obj == null) return false;\n            if(!(obj instanceof Custom)) return false;\n            Custom c = (Custom)obj;\n            return this.num ==c.num  && this.str.equals(c.str);\n        }\n    }\n\n    public static void main(String[] args){\n        List<Custom> list = new ArrayList<>();\n        list.add(new Custom(1,\"Test1\"));\n        list.add(new Custom(2,\"Test2\"));\n        list.remove(new Custom(1,\"Test1\"));\n        list.forEach((obj)->{\n            System.out.print(obj.num);\n            System.out.print(obj.str);\n            System.out.println();\n        });\n    }\n<\/code><\/pre>\n
2Test2\n<\/code><\/pre>\n
\u5b50\u7c7b\u533a\u522b<\/h4>\n\n\n\n\n\n\n\n\n\n\n
\u5b50\u7c7b<\/th>\nArrayList<\/th>\nVector<\/th>\nLinkedList<\/th>\n<\/tr>\n<\/thead>\n
\u5185\u90e8\u5c01\u88c5\u5b9e\u73b0<\/td>\n\u5bf9\u8c61\u6570\u7ec4<\/td>\n\u5bf9\u8c61\u6570\u7ec4<\/td>\n\u94fe\u8868<\/td>\n<\/tr>\n
\u5b58\u50a8\u65b9\u5f0f<\/td>\n\u987a\u5e8f\u5b58\u50a8<\/td>\n\u987a\u5e8f\u5b58\u50a8<\/td>\n\u94fe\u5f0f\u5b58\u50a8<\/td>\n<\/tr>\n
\u5185\u5b58\u4f7f\u7528<\/td>\n\u4ec5\u5b58\u50a8\u6570\u636e\u57df<\/td>\n\u4ec5\u5b58\u50a8\u6570\u636e\u57df<\/td>\n\u9700\u5b58\u50a8\u6307\u9488\u57df<\/td>\n<\/tr>\n
\u67e5\u627e\u65f6\u95f4\u590d\u6742\u5ea6<\/td>\nO(1)<\/td>\nO(1)<\/td>\nO(n)<\/td>\n<\/tr>\n
\u63d2\u5165\u5220\u9664\u6027\u80fd<\/td>\n\u79fb\u52a8\u5927\u91cf\u5143\u7d20\u6027\u80fd\u5dee<\/td>\n\u79fb\u52a8\u5927\u91cf\u5143\u7d20\u6027\u80fd\u5dee<\/td>\n\u8868\u5c3e\u589e\u6539\u6307\u9488\u5220\u6027\u80fd\u597d<\/td>\n<\/tr>\n
\u7ebf\u7a0b\u5b89\u5168\u6027<\/td>\n\u4e0d\u5b89\u5168<\/td>\n\u5b89\u5168<\/td>\n\u4e0d\u5b89\u5168<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
ArrayList\u5b50\u7c7b<\/h3>\n
\u7ee7\u627f\u7ed3\u6784<\/h4>\n