{"id":16331,"date":"2024-09-11T15:39:11","date_gmt":"2024-09-11T07:39:11","guid":{"rendered":"https:\/\/92it.top\/?p=16331"},"modified":"2024-09-11T15:39:11","modified_gmt":"2024-09-11T07:39:11","slug":"java-%e8%af%ad%e6%b3%95%e7%b3%96%ef%bc%8c%e4%bd%a0%e7%94%a8%e8%bf%87%e5%87%a0%e4%b8%aa%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=16331","title":{"rendered":"Java \u8bed\u6cd5\u7cd6\uff0c\u4f60\u7528\u8fc7\u51e0\u4e2a\uff1f"},"content":{"rendered":"\n<p>\u8f6c\u8f7d\uff1a<a href=\"https:\/\/mp.weixin.qq.com\/s?__biz=MzIwNDAyOTI2Nw==&amp;mid=2247499352&amp;idx=1&amp;sn=ebd4cc4f3290398f0965bbc04804821a&amp;chksm=96c4d264a1b35b7242777c25a2319bf8a894c6718ac3d721f6fb430e49aa89556da727ab7185&amp;cur_album_id=2818595943724974083&amp;scene=190#rd\">Java \u8bed\u6cd5\u7cd6\uff0c\u4f60\u7528\u8fc7\u51e0\u4e2a\uff1f<\/a><\/p>\n\n\n\n<p><strong>\u4ec0\u4e48\u662f\u8bed\u6cd5\u7cd6\uff1f<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u8bed\u6cd5\u7cd6\uff08Syntactic Sugar\uff09\u662f\u7f16\u7a0b\u8bed\u8a00\u4e2d\u7684\u4e00\u79cd\u8bbe\u8ba1\u6982\u5ff5\uff0c\u5b83\u6307\u7684\u662f\u5728\u8bed\u6cd5\u5c42\u9762\u4e0a\u5bf9\u67d0\u4e9b\u64cd\u4f5c\u63d0\u4f9b\u66f4\u7b80\u6d01\u3001\u66f4\u6613\u8bfb\u7684\u8868\u793a\u65b9\u5f0f\u3002\u8fd9\u79cd\u8868\u793a\u65b9\u5f0f\u5e76\u4e0d\u4f1a\u65b0\u589e\u8bed\u8a00\u7684\u529f\u80fd\uff0c\u800c\u53ea\u662f\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u66f4\u76f4\u89c2\uff0c\u4fbf\u4e8e\u5f00\u53d1\u8005\u7406\u89e3\u548c\u7ef4\u62a4\u3002<\/p>\n\n\n\n<p>\u8bed\u6cd5\u7cd6\u7684\u4f5c\u7528\uff1a<\/p>\n\n\n\n<ul>\n<li>\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\uff1a\u8bed\u6cd5\u7cd6\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u8d34\u8fd1\u81ea\u7136\u8bed\u8a00\u6216\u5f00\u53d1\u8005\u7684\u601d\u7ef4\u65b9\u5f0f\uff0c\u4ece\u800c\u66f4\u5bb9\u6613\u7406\u89e3\u3002<\/li>\n\n\n\n<li>\u51cf\u5c11\u6837\u677f\u4ee3\u7801\uff1a\u8bed\u6cd5\u7cd6\u53ef\u4ee5\u51cf\u5c11\u91cd\u590d\u7684\u6837\u677f\u4ee3\u7801\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u53ef\u4ee5\u66f4\u4e13\u6ce8\u4e8e\u4e1a\u52a1\u903b\u8f91\u3002<\/li>\n\n\n\n<li>\u964d\u4f4e\u51fa\u9519\u7387\uff1a\u7b80\u5316\u7684\u8bed\u6cd5\u53ef\u4ee5\u51cf\u5c11\u4ee3\u7801\u91cf\uff0c\u4ece\u800c\u964d\u4f4e\u51fa\u9519\u7684\u6982\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u56e0\u6b64\uff0c\u8bed\u6cd5\u7cd6\u4e0d\u662f Java \u8bed\u8a00\u7279\u6709\u7684\uff0c\u5b83\u662f\u5f88\u591a\u7f16\u7a0b\u8bed\u8a00\u8bbe\u8ba1\u4e2d\u7684\u4e00\u4e9b\u8bed\u6cd5\u7279\u6027\uff0c\u8fd9\u4e9b\u7279\u6027\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u6613\u8bfb\uff0c\u4f46\u5e76\u4e0d\u4f1a\u5f15\u5165\u65b0\u7684\u529f\u80fd\u6216\u80fd\u529b\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\uff0cJava\u4e2d\u6709\u54ea\u4e9b\u8bed\u6cd5\u7cd6\u5462\uff1f<\/p>\n\n\n\n<p><strong>Java \u8bed\u6cd5\u7cd6<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>1. \u81ea\u52a8\u88c5\u7bb1\u4e0e\u62c6\u7bb1<\/strong><\/p>\n\n\n\n<p>\u81ea\u52a8\u88c5\u7bb1\u548c\u62c6\u7bb1 (Autoboxing and Unboxing)\u662f Java 5 \u5f15\u5165\u7684\u7279\u6027\uff0c\u7528\u4e8e\u5728\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5b83\u4eec\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b\u4e4b\u95f4\u81ea\u52a8\u8f6c\u6362\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u81ea\u52a8\u88c5\u7bb1\nInteger num = 10; \/\/ \u5b9e\u9645\u4e0a\u662f Integer.valueOf(10)\n\n\/\/ \u81ea\u52a8\u62c6\u7bb1\nint n = num; \/\/ \u5b9e\u9645\u4e0a\u662f num.intValue()<\/pre>\n\n\n\n<p><strong>2. \u589e\u5f3a\u578b for \u5faa\u73af<\/strong><\/p>\n\n\n\n<p>\u589e\u5f3a\u578b for \u5faa\u73af\uff08\u4e5f\u79f0\u4e3a for-each \u5faa\u73af\uff09\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u96c6\u5408\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">int[] numbers = {1, 2, 3, 4, 5};\nfor (int number : numbers) {\n    System.out.println(number);\n}<\/pre>\n\n\n\n<p><strong>3. \u6cdb\u578b<\/strong><\/p>\n\n\n\n<p>\u6cdb\u578b\uff08Generics\uff09\u4f7f\u5f97\u7c7b\u3001\u63a5\u53e3\u548c\u65b9\u6cd5\u53ef\u4ee5\u64cd\u4f5c\u6307\u5b9a\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u63d0\u4f9b\u4e86\u7c7b\u578b\u5b89\u5168\u7684\u68c0\u67e5\u548c\u6d88\u9664\u4e86\u7c7b\u578b\u8f6c\u6362\u7684\u9700\u8981\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">List&lt;String> list = new ArrayList&lt;>();\nlist.add(\"Hello\");\nString s = list.get(0); \/\/ \u4e0d\u9700\u8981\u7c7b\u578b\u8f6c\u6362<\/pre>\n\n\n\n<p><strong>4. \u53ef\u53d8\u53c2\u6570<\/strong><\/p>\n\n\n\n<p>\u53ef\u53d8\u53c2\u6570\uff08Varargs\uff09\u5141\u8bb8\u5728\u65b9\u6cd5\u4e2d\u4f20\u9012\u4efb\u610f\u6570\u91cf\u7684\u53c2\u6570\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public void printNumbers(int... numbers) {\n    for (int number : numbers) {\n        System.out.println(number);\n    }\n}\n\nprintNumbers(1, 2, 3, 4, 5);<\/pre>\n\n\n\n<p><strong>5. try-with-resources<\/strong><\/p>\n\n\n\n<p>try-with-resources \u8bed\u53e5\u7528\u4e8e\u81ea\u52a8\u5173\u95ed\u8d44\u6e90\uff0c\u5b9e\u73b0\u4e86 <code>AutoCloseable<\/code> \u63a5\u53e3\u7684\u8d44\u6e90\u4f1a\u5728\u8bed\u53e5\u7ed3\u675f\u65f6\u81ea\u52a8\u5173\u95ed\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">try (BufferedReader br = new BufferedReader(new FileReader(\"file.txt\"))) {\n    System.out.println(br.readLine());\n} catch (IOException e) {\n    e.printStackTrace();\n}<\/pre>\n\n\n\n<p><strong>6. Lambda \u8868\u8fbe\u5f0f<\/strong><\/p>\n\n\n\n<p>Lambda \u8868\u8fbe\u5f0f\u662f Java 8 \u5f15\u5165\u7684\u7279\u6027\uff0c\u4f7f\u5f97\u53ef\u4ee5\u4f7f\u7528\u66f4\u7b80\u6d01\u7684\u8bed\u6cd5\u6765\u5b9e\u73b0\u51fd\u6570\u5f0f\u63a5\u53e3\uff08\u53ea\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\uff09\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">List&lt;String> list = Arrays.asList(\"a\", \"b\", \"c\");\nlist.forEach(s -> System.out.println(s));<\/pre>\n\n\n\n<p><strong>7. \u65b9\u6cd5\u5f15\u7528<\/strong><\/p>\n\n\n\n<p>\u65b9\u6cd5\u5f15\u7528\uff08Method References\uff09\u662f Lambda \u8868\u8fbe\u5f0f\u7684\u4e00\u79cd\u7b80\u5199\u5f62\u5f0f\uff0c\u7528\u4e8e\u76f4\u63a5\u5f15\u7528\u5df2\u6709\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">list.forEach(System.out::println);<\/pre>\n\n\n\n<p><strong>8. \u5b57\u7b26\u4e32\u8fde\u63a5<\/strong><\/p>\n\n\n\n<p>\u4ece Java 5 \u5f00\u59cb\uff0cJava \u7f16\u8bd1\u5668\u4f1a\u5c06\u5b57\u7b26\u4e32\u7684\u8fde\u63a5\u4f18\u5316\u4e3a <code>StringBuilder<\/code> \u64cd\u4f5c\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">String message = \"Hello, \" + \"world!\"; \/\/ \u5b9e\u9645\u4e0a\u662f new StringBuilder().append(\"Hello, \").append(\"world!\").toString();<\/pre>\n\n\n\n<p><strong>9. Switch \u8868\u8fbe\u5f0f<\/strong><\/p>\n\n\n\n<p>Java 12 \u5f15\u5165\u7684 Switch \u8868\u8fbe\u5f0f\u4f7f\u5f97 Switch \u8bed\u53e5\u66f4\u52a0\u7b80\u6d01\u548c\u7075\u6d3b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">int day = 5;\nString dayName = switch (day) {\n    case 1 -> \"Sunday\";\n    case 2 -> \"Monday\";\n    case 3 -> \"Tuesday\";\n    case 4 -> \"Wednesday\";\n    case 5 -> \"Thursday\";\n    case 6 -> \"Friday\";\n    case 7 -> \"Saturday\";\n    default -> \"Invalid day\";\n};<\/pre>\n\n\n\n<p><strong>10. \u7c7b\u578b\u63a8\u65ad (Type Inference)<\/strong><\/p>\n\n\n\n<p>Java 10 \u5f15\u5165\u4e86\u5c40\u90e8\u53d8\u91cf\u7c7b\u578b\u63a8\u65ad\uff0c\u901a\u8fc7 <code>var<\/code> \u5173\u952e\u5b57\u6765\u58f0\u660e\u53d8\u91cf\uff0c\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u63a8\u65ad\u53d8\u91cf\u7684\u7c7b\u578b\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">var list = new ArrayList&lt;String>();\nlist.add(\"Hello\");<\/pre>\n\n\n\n<p>\u8fd9\u4e9b\u8bed\u6cd5\u7cd6\u4f7f\u5f97 Java \u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u548c\u6613\u8bfb\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u4eec\u5e76\u4e0d\u4f1a\u589e\u52a0\u8bed\u8a00\u672c\u8eab\u7684\u529f\u80fd\uff0c\u53ea\u662f\u5bf9\u5df2\u6709\u529f\u80fd\u7684\u4e00\u79cd\u7b80\u5316\u548c\u5c01\u88c5\u3002<\/p>\n\n\n\n<p><strong>\u603b\u7ed3<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u672c\u6587\uff0c\u6211\u4eec\u4ecb\u7ecd\u4e86 Java \u8bed\u8a00\u4e2d\u7684\u4e00\u4e9b\u8bed\u6cd5\u7cd6\uff0c\u4ece\u4e0a\u9762\u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u51fa\uff0cJava \u8bed\u6cd5\u7cd6\u53ea\u662f\u4e00\u4e9b\u7b80\u5316\u7684\u8bed\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u6613\u8bfb\uff0c\u800c\u672c\u8eab\u5e76\u4e0d\u589e\u52a0\u65b0\u7684\u529f\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8f6c\u8f7d\uff1aJava \u8bed\u6cd5\u7cd6\uff0c\u4f60\u7528\u8fc7\u51e0\u4e2a\uff1f \u4ec0\u4e48\u662f\u8bed\u6cd5\u7cd6\uff1f \u8bed\u6cd5\u7cd6\uff08Syntactic Sugar\uff09\u662f\u7f16\u7a0b\u8bed\u8a00\u4e2d\u7684\u4e00 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,10],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/16331"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16331"}],"version-history":[{"count":1,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/16331\/revisions"}],"predecessor-version":[{"id":16332,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/16331\/revisions\/16332"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16331"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16331"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16331"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}