{"id":202560,"date":"2025-05-22T10:46:57","date_gmt":"2025-05-22T02:46:57","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202560\/"},"modified":"2025-05-22T10:46:57","modified_gmt":"2025-05-22T02:46:57","slug":"java%e5%87%bd%e6%95%b0%e5%bc%8f%e6%8e%a5%e5%8f%a3%e4%b8%8eunaryoperator%e5%87%bd%e6%95%b0%e5%bc%8f%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202560\/","title":{"rendered":"Java\u51fd\u6570\u5f0f\u63a5\u53e3\u4e0eUnaryOperator\u51fd\u6570\u5f0f\u63a5\u53e3"},"content":{"rendered":"

<\/b> <\/p>\n

Java\u51fd\u6570\u5f0f\u63a5\u53e3\u4e0eUnaryOperator\u51fd\u6570\u5f0f\u63a5\u53e3<\/h1>\n

\u5728\u6587\u7ae0\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300aJava\u51fd\u6570\u5f0f\u63a5\u53e3\u4e0eUnaryOperator\u51fd\u6570\u5f0f\u63a5\u53e3\u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n

Java \u4e2d\u7684 UnaryOperator \u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4e00\u4e2a\u63a5\u53d7\u5355\u4e2a\u53c2\u6570\u5e76\u8fd4\u56de\u76f8\u540c\u7c7b\u578b\u503c\u7684\u63a5\u53e3\u3002\u5b83\u7528\u4e8e\u8868\u793a\u76ee\u6807\u51fd\u6570\uff0c\u53ef\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u6216\u65b9\u6cd5\u5f15\u7528\u5b9e\u73b0\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 UnaryOperator \u5c06\u5b57\u7b26\u4e32\u5217\u8868\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u63a5\u53e3\u4e0e UnaryOperator \u51fd\u6570\u5f0f\u63a5\u53e3<\/strong><\/p>\n

\u7b80\u4ecb<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u63a5\u53e3\u662f\u4e00\u4e2a\u5305\u542b\u5355\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u3002Java 8 \u5f15\u5165\u4e86 UnaryOperator<\/code> \u51fd\u6570\u5f0f\u63a5\u53e3\uff0c\u5b83\u662f\u4e00\u4e2a\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\u5e76\u8fd4\u56de\u76f8\u540c\u7c7b\u578b\u503c\u7684\u76ee\u6807\u51fd\u6570\u3002<\/p>\n

UnaryOperator<\/code> \u51fd\u6570\u5f0f\u63a5\u53e3<\/strong><\/p>\n

UnaryOperator<\/code> \u51fd\u6570\u5f0f\u63a5\u53e3\u58f0\u660e\u5982\u4e0b\uff1a<\/p>\n

@FunctionalInterface\npublic interface UnaryOperator<T> {\n    T apply(T t);\n}<\/pre>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  • T<\/code> \u8868\u793a\u64cd\u4f5c\u6570\u548c\u8fd4\u56de\u503c\u7684\u7c7b\u578b\u3002<\/li>\n<\/ul>\n
    \u7528\u6cd5<\/strong><\/p>\n
    \u53ef\u4ee5\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u6216\u65b9\u6cd5\u5f15\u7528\u6765\u5b9e\u73b0 UnaryOperator<\/code> \u63a5\u53e3\uff1a<\/p>\n
    \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\uff1a<\/strong><\/p>\n
    UnaryOperator<String> upperCaseOperator = s -> s.toUpperCase();<\/pre>\n
    \u4f7f\u7528\u65b9\u6cd5\u5f15\u7528\uff1a<\/strong><\/p>\n
    UnaryOperator<Integer> incrementOperator = Integer::increment;<\/pre>\n
    \u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528 UnaryOperator<\/code> \u51fd\u6570\u5f0f\u63a5\u53e3\u5c06\u5b57\u7b26\u4e32\u5217\u8868\u8f6c\u6362\u4e3a\u5927\u5199\u5f62\u5f0f\u7684\u5b9e\u6218\u6848\u4f8b\uff1a<\/p>\n
    import java.util.Arrays;\nimport java.util.List;\nimport java.util.function.UnaryOperator;\n\npublic class UnaryOperatorExample {\n\n    public static void main(String[] args) {\n        \/\/ \u521b\u5efa\u5b57\u7b26\u4e32\u5217\u8868\n        List<String> strings = Arrays.asList(\"Java\", \"Kotlin\", \"Python\");\n\n        \/\/ \u4f7f\u7528 UnaryOperator \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\n        UnaryOperator<String> upperCaseOperator = s -> s.toUpperCase();\n        List<String> upperCaseStrings = strings.stream()\n                .map(upperCaseOperator)\n                .toList();\n\n        \/\/ \u6253\u5370\u8f6c\u6362\u540e\u7684\u5b57\u7b26\u4e32\n        System.out.println(upperCaseStrings);\n    }\n}<\/pre>\n
    \u8f93\u51fa\uff1a<\/strong><\/p>\n
    [JAVA, KOTLIN, PYTHON]<\/pre>\n
    \u4ee5\u4e0a\u5c31\u662f\u300aJava\u51fd\u6570\u5f0f\u63a5\u53e3\u4e0eUnaryOperator\u51fd\u6570\u5f0f\u63a5\u53e3\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8e\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    Java\u51fd\u6570\u5f0f\u63a5\u53e3\u4e0eUnaryO...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202560","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202560"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202560\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}