{"id":848,"date":"2026-03-01T11:51:24","date_gmt":"2026-03-01T03:51:24","guid":{"rendered":"http:\/\/47.100.165.17\/wordpress\/?p=848"},"modified":"2026-03-01T11:51:26","modified_gmt":"2026-03-01T03:51:26","slug":"%e3%80%90java%e3%80%91%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%bb%8e%e5%9f%ba%e7%a1%80%e5%88%b0%e5%ae%9e%e6%88%98%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=848","title":{"rendered":"\u3010Java\u3011\u6570\u636e\u7c7b\u578b\u8be6\u89e3\uff1a\u4ece\u57fa\u7840\u5230\u5b9e\u6218\u5e94\u7528"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4f5c\u4e3a Java \u5165\u95e8\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9\uff0c\u6570\u636e\u7c7b\u578b\u662f\u6bcf\u4e2a\u5f00\u53d1\u8005\u5fc5\u987b\u5403\u900f\u7684\u57fa\u7840\u3002Java \u4f5c\u4e3a\u9759\u6001\u7c7b\u578b\u8bed\u8a00\uff0c\u8981\u6c42\u6240\u6709\u53d8\u91cf\u5fc5\u987b\u5148\u58f0\u660e\u7c7b\u578b\u518d\u4f7f\u7528\uff0c\u8fd9\u65e2\u662f\u5b83\u7684\u4e25\u8c28\u4e4b\u5904\uff0c\u4e5f\u5bb9\u6613\u8ba9\u65b0\u624b\u8e29\u5751\u3002\u4eca\u5929\u5c31\u5e26\u5927\u5bb6\u5168\u9762\u68b3\u7406 Java \u6570\u636e\u7c7b\u578b\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9\uff0c\u7ed3\u5408\u5b9e\u9645\u5f00\u53d1\u573a\u666f\u804a\u804a\u600e\u4e48\u7528\u624d\u89c4\u8303\uff5e<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u6570\u636e\u7c7b\u578b\u7684\u4e24\u5927\u5206\u7c7b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u7684\u6570\u636e\u7c7b\u578b\u4e3b\u8981\u5206\u4e3a\u4e24\u7c7b\uff0c\u7528\u4e00\u5f20\u8868\u5c31\u80fd\u770b\u660e\u767d\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">\u7c7b\u578b<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u5305\u542b\u7c7b\u522b<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u9ed8\u8ba4\u503c<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u5b58\u50a8\u7279\u70b9<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5e03\u5c14\u578b\uff08boolean\uff09\u3001\u6570\u503c\u578b\uff08byte\/short\/int\/long\/float\/double\uff09\u3001\u5b57\u7b26\u578b\uff08char\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5404\u6709\u9ed8\u8ba4\u503c\uff08\u5982 int \u4e3a 0\uff09<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u76f4\u63a5\u5b58\u50a8\u6570\u503c\uff0c\u5360\u5185\u5b58\u5c0f<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u6570\u7ec4\u3001\u7c7b\u3001\u63a5\u53e3<\/td><td class=\"has-text-align-left\" data-align=\"left\">null<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5b58\u50a8\u5bf9\u8c61\u5185\u5b58\u5730\u5740\uff0c\u5b9e\u9645\u6570\u636e\u5728\u5806\u4e2d<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u8981\u7279\u522b\u63d0\u9192\uff1a<strong>\u5c40\u90e8\u53d8\u91cf\u5fc5\u987b\u521d\u59cb\u5316<\/strong>\uff0c\u54ea\u6015\u662f\u57fa\u672c\u7c7b\u578b\u4e5f\u4e0d\u80fd\u76f4\u63a5\u7528\uff1b\u4f46\u6210\u5458\u53d8\u91cf\u6216\u9759\u6001\u53d8\u91cf\u4f1a\u81ea\u52a8\u8d4b\u4e88\u9ed8\u8ba4\u503c\uff0c\u4e0d\u7528\u624b\u52a8\u8d4b\u503c\u4e5f\u80fd\u7f16\u8bd1\u901a\u8fc7\uff5e<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5b9e\u6218\u6307\u5357<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u6570\u503c\u578b\uff1a\u9009\u5bf9\u7c7b\u578b\u4e0d\u6d6a\u8d39\u5185\u5b58<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>byte\uff081 \u5b57\u8282\uff09<\/strong>\uff1a\u53d6\u503c\u8303\u56f4 &#8211; 128~127\uff0c\u9002\u5408\u7f51\u7edc\u4f20\u8f93\u3001\u5927\u6587\u4ef6\u8bfb\u5199\u573a\u666f\uff0c\u80fd\u8282\u7701\u5185\u5b58\u3002\u6bd4\u5982\u5904\u7406\u4e8c\u8fdb\u5236\u6587\u4ef6\u65f6\uff0c\u7528 byte \u6570\u7ec4\u6bd4 int \u6570\u7ec4\u9ad8\u6548\u592a\u591a\u3002<\/li>\n\n\n\n<li><strong>short\uff082 \u5b57\u8282\uff09<\/strong>\uff1a\u5b9e\u9645\u5f00\u53d1\u4e2d\u5f88\u5c11\u7528\uff0c\u53d6\u503c\u8303\u56f4 &#8211; 32768~32767\uff0c\u4e00\u822c\u7528 int \u66ff\u4ee3\u5c31\u591f\u4e86\u3002<\/li>\n\n\n\n<li><strong>int\uff084 \u5b57\u8282\uff09<\/strong>\uff1a\u9ed8\u8ba4\u9996\u9009\u7684\u6574\u578b\u7c7b\u578b\uff01\u53d6\u503c\u8303\u56f4 &#8211; 2\u00b9\u00b3\u00b9~2\u00b9\u00b3\u00b9-1\uff0c\u65e5\u5e38\u5f00\u53d1\u4e2d\u6574\u6570\u8ba1\u7b97\u57fa\u672c\u90fd\u80fd\u8986\u76d6\uff0c\u4e0d\u7528\u76f2\u76ee\u7528 long\u3002<\/li>\n\n\n\n<li><strong>long\uff088 \u5b57\u8282\uff09<\/strong>\uff1aint \u5b58\u4e0d\u4e0b\u65f6\u624d\u7528\uff08\u6bd4\u5982\u5b58\u50a8\u65f6\u95f4\u6233\u3001\u5927\u6570\u503c\uff09\uff0c\u58f0\u660e\u65f6\u672b\u5c3e\u5fc5\u987b\u52a0<strong>\u5927\u5199 L<\/strong>\uff08\u5c0f\u5199 l \u5bb9\u6613\u548c 1 \u6df7\u6dc6\uff0c\u8e29\u8fc7\u5751\u7684\u90fd\u61c2\uff5e\uff09\u3002<\/li>\n\n\n\n<li><strong>float\uff084 \u5b57\u8282\uff09<\/strong>\uff1a\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff0c\u7cbe\u5ea6 6-7 \u4f4d\uff0c<strong>\u7edd\u5bf9\u4e0d\u80fd\u7528\u4e8e\u91d1\u989d\u8ba1\u7b97<\/strong>\uff01\u58f0\u660e\u65f6\u8981\u52a0\u5c0f\u5199 f\uff0c\u6bd4\u5982<code>float price = 10.9f<\/code>\u3002<\/li>\n\n\n\n<li><strong>double\uff088 \u5b57\u8282\uff09<\/strong>\uff1a\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff0c\u7cbe\u5ea6 15-17 \u4f4d\uff0c\u9ed8\u8ba4\u7684\u6d6e\u70b9\u7c7b\u578b\uff0c\u4f46\u540c\u6837\u4e0d\u9002\u5408\u7cbe\u786e\u8ba1\u7b97\u3002\u91d1\u878d\u573a\u666f\u5efa\u8bae\u7528 BigDecimal\uff0c\u6216\u8005\u4e58\u4ee5 100 \u8f6c\u6210 int \u5904\u7406\uff08\u6bd4\u5982\u5206\u5355\u4f4d\u8ba1\u7b97\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u5e03\u5c14\u578b\u4e0e\u5b57\u7b26\u578b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>boolean\uff081bit\uff09<\/strong>\uff1a\u53ea\u6709 true\/false \u4e24\u4e2a\u503c\uff0c\u4e13\u95e8\u7528\u4e8e\u6761\u4ef6\u5224\u65ad\uff0c\u6bd4\u5982 if \u8bed\u53e5\u3001\u5faa\u73af\u63a7\u5236\u3002\u6ce8\u610f\uff1aboolean \u4e0d\u80fd\u5f3a\u5236\u8f6c\u6362\u4e3a\u5176\u4ed6\u7c7b\u578b\uff01<\/li>\n\n\n\n<li><strong>char\uff082 \u5b57\u8282\uff09<\/strong>\uff1a\u5b58\u50a8 Unicode \u5b57\u7b26\uff0c\u53d6\u503c\u8303\u56f4 0~65535\u3002\u5fc5\u987b\u7528\u5355\u5f15\u53f7\u5305\u88f9\uff08\u53cc\u5f15\u53f7\u662f\u5b57\u7b26\u4e32\uff09\uff0c\u6bd4\u5982<code>char c = 'A'<\/code>\u3002\u60f3\u8981\u5b58\u50a8\u4e2d\u6587\u5b57\u7b26\u4e5f\u6ca1\u95ee\u9898\uff0c\u56e0\u4e3a Unicode \u5305\u542b\u4e2d\u6587\u7f16\u7801\uff5e<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5bb9\u6613\u6df7\u6dc6\u7684\u6982\u5ff5\uff1a\u6bd4\u7279\u4e0e\u5b57\u8282<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u65b0\u624b\u4f1a\u641e\u6df7 bit \u548c Byte\uff0c\u5176\u5b9e\u8bb0\u4f4f\u4e24\u4e2a\u6838\u5fc3\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>1Byte = 8bit\uff081 \u5b57\u8282 = 8 \u6bd4\u7279\uff09\uff0c\u6bd4\u7279\u662f\u6700\u5c0f\u5b58\u50a8\u5355\u4f4d\uff080 \u6216 1\uff09\uff0c\u5b57\u8282\u662f\u5b9e\u9645\u6570\u636e\u5b58\u50a8\u7684\u5e38\u7528\u5355\u4f4d\uff1b<\/li>\n\n\n\n<li>\u5355\u4f4d\u6362\u7b97\uff1a1KB=1024Byte\u30011MB=1024KB&#8230; \u65e5\u5e38\u8bf4\u7684\u6587\u4ef6\u5927\u5c0f\u3001\u5185\u5b58\u90fd\u662f\u6309 Byte \u8ba1\u7b97\u7684\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u7c7b\u578b\u8f6c\u6362\u4e0e\u5305\u88c5\u5668\u7c7b\u578b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. int \u4e0e char \u4e92\u8f6c\u6280\u5de7<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>int \u8f6c char\uff1a\u53ef\u4ee5\u5f3a\u5236\u8f6c\u6362\uff08<code>char c = (char)65<\/code> \u5f97\u5230 &#8216;A&#8217;\uff09\uff0c\u4e5f\u80fd\u7528<code>Character.forDigit(10,16)<\/code>\u8f6c\u5341\u516d\u8fdb\u5236\u5b57\u7b26\uff1b<\/li>\n\n\n\n<li>char \u8f6c int\uff1a\u76f4\u63a5\u8d4b\u503c\uff08<code>int num = '1'<\/code> \u5f97\u5230\u5b57\u7b26\u7f16\u7801\uff09\uff0c\u6216\u7528<code>'1' - '0'<\/code>\u5feb\u901f\u8f6c\u6570\u5b57\uff08\u63a8\u8350\uff01\u7b80\u5355\u9ad8\u6548\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u5305\u88c5\u5668\u7c7b\u578b\u4e0e\u81ea\u52a8\u88c5\u7bb1\u62c6\u7bb1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u7c7b\u578b\u90fd\u6709\u5bf9\u5e94\u7684\u5305\u88c5\u5668\u7c7b\u578b\uff08\u5982 int\u2192Integer\uff09\uff0cJava5 \u540e\u652f\u6301\u81ea\u52a8\u88c5\u7bb1\u62c6\u7bb1\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Integer integer = 42; \/\/ \u81ea\u52a8\u88c5\u7bb1\uff08\u76f8\u5f53\u4e8enew Integer(42)\uff09\nint num = integer; \/\/ \u81ea\u52a8\u62c6\u7bb1\uff08\u76f8\u5f53\u4e8einteger.intValue()\uff09\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f00\u53d1\u4e2d\u96c6\u5408\u7c7b\uff08\u5982 ArrayList\uff09\u53ea\u80fd\u5b58\u5bf9\u8c61\uff0c\u8fd9\u65f6\u5019\u5305\u88c5\u5668\u7c7b\u578b\u5c31\u6d3e\u4e0a\u7528\u573a\u4e86\uff5e \u4f46\u8981\u6ce8\u610f\uff1a\u62c6\u7bb1\u65f6\u4e0d\u80fd\u4e3a null\uff0c\u5426\u5219\u4f1a\u629b\u7a7a\u6307\u9488\u5f02\u5e38\uff01<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u5806\u4e0e\u6808\uff1a\u6570\u636e\u5b58\u50a8\u7684\u5e95\u5c42\u903b\u8f91<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u4eba\u7591\u60d1\uff1a\u4e3a\u4ec0\u4e48\u57fa\u672c\u7c7b\u578b\u5b58\u5728\u6808\uff0c\u5f15\u7528\u7c7b\u578b\u5b58\u5728\u5806\uff1f<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6808\uff1a\u8bbf\u95ee\u901f\u5ea6\u5feb\uff0c\u7f16\u8bd1\u65f6\u5c31\u80fd\u786e\u5b9a\u751f\u547d\u5468\u671f\uff0c\u9002\u5408\u5b58\u50a8\u5c0f\u6570\u636e\uff08\u57fa\u672c\u7c7b\u578b\u503c\u3001\u5f15\u7528\u5730\u5740\uff09\uff1b<\/li>\n\n\n\n<li>\u5806\uff1a\u52a8\u6001\u5206\u914d\u5185\u5b58\uff0c\u8fd0\u884c\u65f6\u521b\u5efa\u5bf9\u8c61\uff0c\u9002\u5408\u5b58\u50a8\u5927\u6570\u636e\uff08\u5982\u5b57\u7b26\u4e32\u3001\u81ea\u5b9a\u4e49\u5bf9\u8c61\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3e\u4e2a\u4f8b\u5b50\uff1a<code>String name = new String(\"\u4e91\u626c\")<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6808\u4e2d\u5b58\u50a8\u5f15\u7528\u5730\u5740<code>name<\/code>\uff1b<\/li>\n\n\n\n<li>\u5806\u4e2d\u5b58\u50a8\u5b9e\u9645\u5b57\u7b26\u4e32\u5bf9\u8c61 &#8220;\u4e91\u626c&#8221;\uff1b<\/li>\n\n\n\n<li>\u901a\u8fc7<code>name<\/code>\u7684\u5730\u5740\u5c31\u80fd\u627e\u5230\u5806\u4e2d\u7684\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u5f00\u53d1\u907f\u5751\u603b\u7ed3<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6d6e\u70b9\u578b\u4e0d\u7528\u4e8e\u7cbe\u786e\u8ba1\u7b97\uff0c\u91d1\u878d\u573a\u666f\u7528 BigDecimal\uff1b<\/li>\n\n\n\n<li>\u6574\u578b\u4f18\u5148\u7528 int\uff0clong \u53ea\u5728\u5fc5\u8981\u65f6\u7528\uff0c\u907f\u514d\u5185\u5b58\u6d6a\u8d39\uff1b<\/li>\n\n\n\n<li>\u5c40\u90e8\u53d8\u91cf\u5fc5\u987b\u521d\u59cb\u5316\uff0c\u5f15\u7528\u7c7b\u578b\u8981\u5224\u7a7a\u540e\u518d\u4f7f\u7528\uff1b<\/li>\n\n\n\n<li>char \u7528\u5355\u5f15\u53f7\uff0c\u5b57\u7b26\u4e32\u7528\u53cc\u5f15\u53f7\uff0c\u522b\u641e\u6df7\u8bed\u6cd5\uff1b<\/li>\n\n\n\n<li>\u81ea\u52a8\u62c6\u7bb1\u65f6\u6ce8\u610f null \u503c\uff0c\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u6570\u636e\u7c7b\u578b\u770b\u4f3c\u57fa\u7840\uff0c\u4f46\u7528\u597d\u80fd\u63d0\u5347\u4ee3\u7801\u6548\u7387\u548c\u7a33\u5b9a\u6027\u3002\u5982\u679c\u5927\u5bb6\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u9047\u5230\u6570\u636e\u7c7b\u578b\u76f8\u5173\u7684\u95ee\u9898\uff0c\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u4ea4\u6d41\uff5e \u4e0b\u4e00\u7bc7\u6211\u4eec\u804a\u804a Java \u7c7b\u578b\u8f6c\u6362\u7684\u8fdb\u9636\u6280\u5de7\uff0c\u656c\u8bf7\u671f\u5f85\uff01<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4f5c\u4e3a Java 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fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":851,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[15],"class_list":["post-848","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-java"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=848"}],"version-history":[{"count":4,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/848\/revisions"}],"predecessor-version":[{"id":888,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/848\/revisions\/888"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/851"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}