{"id":422,"date":"2024-10-19T13:19:35","date_gmt":"2024-10-19T05:19:35","guid":{"rendered":"http:\/\/www.cmd137blog.top\/?p=422"},"modified":"2024-10-19T13:36:06","modified_gmt":"2024-10-19T05:36:06","slug":"java-%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e5%92%8c%e5%bc%95%e7%94%a8%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"http:\/\/www.cmd137blog.top\/?p=422","title":{"rendered":"Java \u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n<p>Java \u63d0\u4f9b\u4e86\u516b\u79cd<strong>\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/strong>\uff0c\u5b83\u4eec\u7528\u4e8e\u5b58\u50a8\u7b80\u5355\u7684\u6570\u636e\u503c\u3002\u57fa\u672c\u6570\u636e\u7c7b\u578b\u662f<strong>\u503c\u7c7b\u578b<\/strong>\uff0c\u6570\u636e\u76f4\u63a5\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u3002\u6bcf\u4e00\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u90fd\u6709\u56fa\u5b9a\u7684\u5185\u5b58\u5927\u5c0f\u548c\u660e\u786e\u7684\u6570\u636e\u8303\u56f4\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u6574\u578b\uff08Integer Types\uff09<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6570\u636e\u7c7b\u578b<\/th><th>\u4f4d\u6570<\/th><th>\u9ed8\u8ba4\u503c<\/th><th>\u8303\u56f4<\/th><\/tr><\/thead><tbody><tr><td><code>byte<\/code><\/td><td>8\u4f4d<\/td><td>0<\/td><td>-128 \u5230 127<\/td><\/tr><tr><td><code>short<\/code><\/td><td>16\u4f4d<\/td><td>0<\/td><td>-32,768 \u5230 32,767<\/td><\/tr><tr><td><code>int<\/code><\/td><td>32\u4f4d<\/td><td>0<\/td><td>-2^31 \u5230 2^31 &#8211; 1<\/td><\/tr><tr><td><code>long<\/code><\/td><td>64\u4f4d<\/td><td>0L<\/td><td>-2^63 \u5230 2^63 &#8211; 1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u6d6e\u70b9\u578b\uff08Floating-Point Types\uff09<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6570\u636e\u7c7b\u578b<\/th><th>\u4f4d\u6570<\/th><th>\u9ed8\u8ba4\u503c<\/th><th>\u8303\u56f4<\/th><\/tr><\/thead><tbody><tr><td><code>float<\/code><\/td><td>32\u4f4d<\/td><td>0.0f<\/td><td>1.4E-45 \u5230 3.4E+38<\/td><\/tr><tr><td><code>double<\/code><\/td><td>64\u4f4d<\/td><td>0.0d<\/td><td>4.9E-324 \u5230 1.7E+308<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u5b57\u7b26\u578b\uff08Character Type\uff09<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6570\u636e\u7c7b\u578b<\/th><th>\u4f4d\u6570<\/th><th>\u9ed8\u8ba4\u503c<\/th><th>\u8303\u56f4<\/th><\/tr><\/thead><tbody><tr><td><code>char<\/code><\/td><td>16\u4f4d<\/td><td>&#8216;\\u0000&#8217;<\/td><td>0 \u5230 65,535<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u5e03\u5c14\u578b\uff08Boolean Type\uff09<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6570\u636e\u7c7b\u578b<\/th><th>\u4f4d\u6570<\/th><th>\u9ed8\u8ba4\u503c<\/th><th>\u8303\u56f4<\/th><\/tr><\/thead><tbody><tr><td><code>boolean<\/code><\/td><td>1\u4f4d<\/td><td>false<\/td><td>true\/false<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u7279\u6027<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5185\u5b58\u5b58\u50a8<\/strong>\uff1a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u76f4\u63a5\u5b58\u50a8\u5728\u6808\u5185\u5b58\u4e2d\uff0c\u4e14\u5177\u6709\u56fa\u5b9a\u5927\u5c0f\uff0c\u56e0\u6b64\u5b83\u4eec\u7684\u8bbf\u95ee\u901f\u5ea6\u975e\u5e38\u5feb\u3002<\/li>\n\n\n\n<li><strong>\u4e0d\u53ef\u53d8\u6027<\/strong>\uff1a\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u4e00\u65e6\u8d4b\u503c\u540e\uff0c\u5176\u503c\u5c31\u4e0d\u4f1a\u968f\u5916\u754c\u7684\u53d8\u5316\u800c\u6539\u53d8\u3002<\/li>\n\n\n\n<li><strong>\u9ed8\u8ba4\u503c<\/strong>\uff1a\u5f53\u58f0\u660e\u4e00\u4e2a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u53d8\u91cf\u800c\u4e0d\u8d4b\u521d\u503c\u65f6\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u4e3a\u5176\u5206\u914d\u4e00\u4e2a\u9ed8\u8ba4\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n<p><strong>\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/strong> \u662f\u6307\u90a3\u4e9b\u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5305\u62ec\u7c7b\u3001\u63a5\u53e3\u3001\u6570\u7ec4\u548c\u679a\u4e3e\u7b49\u3002\u5b83\u4eec\u5b58\u50a8\u5728\u5806\u5185\u5b58\u4e2d\uff0c\u53d8\u91cf\u5b58\u50a8\u7684\u662f\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u7c7b\uff08Class\uff09<\/h3>\n\n\n\n<p>\u7c7b\u662f\u5f15\u7528\u6570\u636e\u7c7b\u578b\u7684\u4e00\u4e2a\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u3002\u901a\u8fc7\u7c7b\u53ef\u4ee5\u521b\u5efa\u5bf9\u8c61\uff0c\u7c7b\u7684\u5b9e\u4f8b\u5316\u662f Java \u7f16\u7a0b\u4e2d\u7684\u6838\u5fc3\u64cd\u4f5c\u4e4b\u4e00\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>Person person = new Person();\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\uff0c<code>person<\/code> \u662f\u4e00\u4e2a\u5f15\u7528\u53d8\u91cf\uff0c\u5b83\u4fdd\u5b58\u7684\u662f\u5bf9\u8c61 <code>Person<\/code> \u5728\u5185\u5b58\u4e2d\u7684\u5730\u5740\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u63a5\u53e3\uff08Interface\uff09<\/h3>\n\n\n\n<p>\u63a5\u53e3\u662f\u53e6\u4e00\u4e2a\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u7528\u4e8e\u5b9a\u4e49\u65b9\u6cd5\u7684\u96c6\u5408\u3002\u5b9e\u73b0\u63a5\u53e3\u7684\u7c7b\u5fc5\u987b\u63d0\u4f9b\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u5b9e\u73b0\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>public interface Animal {\n    void speak();\n}\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u6570\u7ec4\uff08Array\uff09<\/h3>\n\n\n\n<p>\u6570\u7ec4\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u867d\u7136\u5b83\u7684\u5143\u7d20\u53ef\u4ee5\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u4f46\u6570\u7ec4\u672c\u8eab\u662f\u4e00\u4e2a\u5bf9\u8c61\u3002\u521b\u5efa\u6570\u7ec4\u65f6\uff0c\u7cfb\u7edf\u4f1a\u4e3a\u6570\u7ec4\u5bf9\u8c61\u5728\u5806\u5185\u5b58\u4e2d\u5206\u914d\u7a7a\u95f4\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>int[] numbers = new int[5];\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u5b57\u7b26\u4e32\uff08String\uff09<\/h3>\n\n\n\n<p><code>String<\/code> \u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u867d\u7136\u770b\u8d77\u6765\u50cf\u57fa\u672c\u7c7b\u578b\uff0c\u4f46\u5b83\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u7c7b\u3002\u5b57\u7b26\u4e32\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5373\u5b57\u7b26\u4e32\u7684\u503c\u4e00\u65e6\u521b\u5efa\uff0c\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>String str = \"Hello, World!\";\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">5. \u5f15\u7528\u6570\u636e\u7c7b\u578b\u7684\u7279\u6027<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5185\u5b58\u5b58\u50a8<\/strong>\uff1a\u5f15\u7528\u7c7b\u578b\u7684\u53d8\u91cf\u5b58\u50a8\u5728\u6808\u5185\u5b58\u4e2d\uff0c\u800c\u5176\u5f15\u7528\u7684\u5bf9\u8c61\u5b58\u50a8\u5728\u5806\u5185\u5b58\u4e2d\u3002<\/li>\n\n\n\n<li><strong>\u53ef\u53d8\u6027<\/strong>\uff1a\u5f15\u7528\u7c7b\u578b\u7684\u5bf9\u8c61\u53ef\u4ee5\u6539\u53d8\uff0c\u5f15\u7528\u53d8\u91cf\u53ef\u4ee5\u6307\u5411\u4e0d\u540c\u7684\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li><strong>\u9ed8\u8ba4\u503c<\/strong>\uff1a\u5f15\u7528\u6570\u636e\u7c7b\u578b\u7684\u9ed8\u8ba4\u503c\u4e3a <code>null<\/code>\uff0c\u8868\u793a\u53d8\u91cf\u672a\u5f15\u7528\u4efb\u4f55\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4e0e\u5f15\u7528\u7c7b\u578b\u7684\u533a\u522b<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u6027<\/th><th>\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/th><th>\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/th><\/tr><\/thead><tbody><tr><td><strong>\u5b58\u50a8\u4f4d\u7f6e<\/strong><\/td><td>\u6808\u5185\u5b58<\/td><td>\u6808\u5185\u5b58\u548c\u5806\u5185\u5b58<\/td><\/tr><tr><td><strong>\u9ed8\u8ba4\u503c<\/strong><\/td><td>0\uff08\u6570\u503c\u578b\uff09\uff0cfalse\uff08\u5e03\u5c14\u578b\uff09<\/td><td>null<\/td><\/tr><tr><td><strong>\u53ef\u53d8\u6027<\/strong><\/td><td>\u4e0d\u53ef\u53d8<\/td><td>\u5bf9\u8c61\u5185\u5bb9\u53ef\u53d8<\/td><\/tr><tr><td><strong>\u5185\u5b58\u5927\u5c0f<\/strong><\/td><td>\u56fa\u5b9a<\/td><td>\u4e0d\u56fa\u5b9a\uff0c\u53d6\u51b3\u4e8e\u5bf9\u8c61\u5927\u5c0f<\/td><\/tr><tr><td><strong>\u6027\u80fd<\/strong><\/td><td>\u9ad8\u6548\uff0c\u56e0\u76f4\u63a5\u5b58\u50a8\u5728\u6808\u5185\u5b58\u4e2d<\/td><td>\u8f83\u6162\uff0c\u56e0\u9700\u8981\u901a\u8fc7\u5f15\u7528\u8bbf\u95ee\u5806\u5185\u5b58<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5f62\u53c2\u548c\u5b9e\u53c2\u7684\u95ee\u9898\uff1a<\/h2>\n\n\n\n<p>\u5728 Java \u4e2d\uff0c<strong>\u5305\u88c5\u7c7b\uff08Wrapper Classes\uff09<\/strong> \u662f\u5bf9\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u5c01\u88c5\uff0c\u7528\u4e8e\u5c06\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u5bf9\u8c61\u3002\u7531\u4e8e Java \u7684\u6cdb\u578b\uff08Generics\uff09\u4e0d\u652f\u6301\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u800c\u8bb8\u591a\u96c6\u5408\u6846\u67b6\uff08\u5982 <code>ArrayList<\/code>\u3001<code>HashMap<\/code> \u7b49\uff09\u9700\u8981\u64cd\u4f5c\u5bf9\u8c61\uff0c\u6240\u4ee5\u5305\u88c5\u7c7b\u5c31\u663e\u5f97\u7279\u522b\u91cd\u8981\u3002<\/p>\n\n\n\n<p>\u6bcf\u4e2a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u90fd\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/th><th>\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b<\/th><\/tr><\/thead><tbody><tr><td><code>byte<\/code><\/td><td><code>Byte<\/code><\/td><\/tr><tr><td><code>short<\/code><\/td><td><code>Short<\/code><\/td><\/tr><tr><td><code>int<\/code><\/td><td><code>Integer<\/code><\/td><\/tr><tr><td><code>long<\/code><\/td><td><code>Long<\/code><\/td><\/tr><tr><td><code>float<\/code><\/td><td><code>Float<\/code><\/td><\/tr><tr><td><code>double<\/code><\/td><td><code>Double<\/code><\/td><\/tr><tr><td><code>char<\/code><\/td><td><code>Character<\/code><\/td><\/tr><tr><td><code>boolean<\/code><\/td><td><code>Boolean<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e00\u3001\u5305\u88c5\u7c7b\u7684\u4f5c\u7528<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e0e\u96c6\u5408\u7c7b\u4e00\u8d77\u4f7f\u7528<\/strong> \u7531\u4e8e\u96c6\u5408\u7c7b\uff08\u5982 <code>ArrayList<\/code>\u3001<code>HashMap<\/code>\uff09\u53ea\u80fd\u64cd\u4f5c\u5bf9\u8c61\u800c\u4e0d\u80fd\u64cd\u4f5c\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u56e0\u6b64\u5305\u88c5\u7c7b\u4f7f\u5f97\u57fa\u672c\u6570\u636e\u7c7b\u578b\u80fd\u591f\u4e0e\u8fd9\u4e9b\u96c6\u5408\u7c7b\u517c\u5bb9\u3002java\u590d\u5236\u4ee3\u7801<code>ArrayList&lt;Integer&gt; list = new ArrayList&lt;&gt;(); list.add(10); \/\/ \u81ea\u52a8\u88c5\u7bb1<\/code><\/li>\n\n\n\n<li><strong>\u63d0\u4f9b\u989d\u5916\u7684\u65b9\u6cd5<\/strong> \u5305\u88c5\u7c7b\u63d0\u4f9b\u4e86\u8bb8\u591a\u5b9e\u7528\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c<code>Integer<\/code> \u7c7b\u63d0\u4f9b\u4e86\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570\u7684 <code>parseInt()<\/code> \u65b9\u6cd5\u3002java\u590d\u5236\u4ee3\u7801<code>int number = Integer.parseInt(\"100\");<\/code><\/li>\n\n\n\n<li><strong>\u652f\u6301\u7c7b\u578b\u8f6c\u6362<\/strong> \u5305\u88c5\u7c7b\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\uff0c\u4f8b\u5982\u5c06\u5b57\u7b26\u4e32\u8f6c\u4e3a\u76f8\u5e94\u7684\u57fa\u672c\u7c7b\u578b\uff0c\u6216\u5c06\u57fa\u672c\u7c7b\u578b\u7684\u503c\u8f6c\u4e3a\u5b57\u7b26\u4e32\u3002java\u590d\u5236\u4ee3\u7801<code>String str = Integer.toString(123);<\/code><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e8c\u3001\u81ea\u52a8\u88c5\u7bb1\u4e0e\u62c6\u7bb1<\/h3>\n\n\n\n<p><strong>\u81ea\u52a8\u88c5\u7bb1\uff08Autoboxing\uff09<\/strong> \u662f\u6307 Java \u7f16\u8bd1\u5668\u5728\u9700\u8981\u65f6\uff0c\u81ea\u52a8\u5c06\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u5176\u5bf9\u5e94\u7684\u5305\u88c5\u7c7b\u5bf9\u8c61\u3002<strong>\u62c6\u7bb1\uff08Unboxing\uff09<\/strong> \u5219\u662f\u5c06\u5305\u88c5\u7c7b\u5bf9\u8c61\u81ea\u52a8\u8f6c\u6362\u4e3a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u3002\u81ea\u52a8\u88c5\u7bb1\u548c\u62c6\u7bb1\u8ba9\u57fa\u672c\u7c7b\u578b\u548c\u5305\u88c5\u7c7b\u4e4b\u95f4\u7684\u8f6c\u6362\u66f4\u52a0\u76f4\u89c2\u548c\u7b80\u5355\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. \u81ea\u52a8\u88c5\u7bb1<\/h4>\n\n\n\n<p>\u5f53\u6211\u4eec\u5c06\u4e00\u4e2a\u57fa\u672c\u6570\u636e\u7c7b\u578b\u8d4b\u503c\u7ed9\u5305\u88c5\u7c7b\u65f6\uff0cJava \u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5b8c\u6210\u7c7b\u578b\u8f6c\u6362\uff0c\u8fd9\u5c31\u662f\u81ea\u52a8\u88c5\u7bb1\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>int num = 10;\nInteger obj = num; \/\/ \u81ea\u52a8\u88c5\u7bb1\n<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c<code>int<\/code> \u7c7b\u578b\u7684\u53d8\u91cf <code>num<\/code> \u88ab\u81ea\u52a8\u8f6c\u6362\u4e3a <code>Integer<\/code> \u5bf9\u8c61\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2. \u62c6\u7bb1<\/h4>\n\n\n\n<p>\u5f53\u6211\u4eec\u5c06\u4e00\u4e2a\u5305\u88c5\u7c7b\u5bf9\u8c61\u8d4b\u503c\u7ed9\u57fa\u672c\u6570\u636e\u7c7b\u578b\u65f6\uff0cJava \u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5b8c\u6210\u5bf9\u8c61\u5230\u57fa\u672c\u7c7b\u578b\u7684\u8f6c\u6362\uff0c\u8fd9\u5c31\u662f\u62c6\u7bb1\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>Integer obj = new Integer(100);\nint num = obj; \/\/ \u62c6\u7bb1\n<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c<code>Integer<\/code> \u5bf9\u8c61 <code>obj<\/code> \u88ab\u81ea\u52a8\u8f6c\u6362\u4e3a <code>int<\/code> \u7c7b\u578b\u7684\u53d8\u91cf <code>num<\/code>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e09\u3001\u5305\u88c5\u7c7b\u7684\u5e38\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u6bcf\u4e2a\u5305\u88c5\u7c7b\u90fd\u63d0\u4f9b\u4e86\u8bb8\u591a\u7528\u4e8e\u5904\u7406\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u9759\u6001\u65b9\u6cd5\u548c\u5b9e\u4f8b\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. <code>parseXXX()<\/code> \u548c <code>valueOf()<\/code> \u65b9\u6cd5<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>parseXXX(String s)<\/code>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5bf9\u5e94\u7684\u57fa\u672c\u7c7b\u578b\u3002<\/li>\n\n\n\n<li><code>valueOf(String s)<\/code>\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5305\u88c5\u7c7b\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>int num = Integer.parseInt(\"123\");       \/\/ \u8f6c\u6362\u4e3a\u57fa\u672c\u7c7b\u578b\nInteger obj = Integer.valueOf(\"123\");    \/\/ \u8f6c\u6362\u4e3a\u5305\u88c5\u7c7b\u5bf9\u8c61\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">2. <code>xxxValue()<\/code> \u65b9\u6cd5<\/h4>\n\n\n\n<p>\u5305\u88c5\u7c7b\u63d0\u4f9b\u4e86\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u57fa\u672c\u7c7b\u578b\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c<code>Integer<\/code> \u7c7b\u7684 <code>intValue()<\/code> \u65b9\u6cd5\u53ef\u4ee5\u5c06 <code>Integer<\/code> \u5bf9\u8c61\u8f6c\u6362\u4e3a <code>int<\/code> \u7c7b\u578b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>Integer obj = new Integer(50);\nint num = obj.intValue();\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">3. \u6bd4\u8f83\u548c\u8f6c\u6362\u65b9\u6cd5<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>compareTo()<\/code>\uff1a\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5305\u88c5\u7c7b\u5bf9\u8c61\u7684\u5927\u5c0f\u3002<\/li>\n\n\n\n<li><code>toString()<\/code>\uff1a\u5c06\u5305\u88c5\u7c7b\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>Integer num1 = 100;\nInteger num2 = 200;\nint result = num1.compareTo(num2); \/\/ \u8fd4\u56de\u8d1f\u6570\uff0c\u56e0\u4e3a num1 \u5c0f\u4e8e num2\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u56db\u3001\u5305\u88c5\u7c7b\u7684\u4e0d\u53ef\u53d8\u6027<\/h3>\n\n\n\n<p>\u4e0e\u5b57\u7b26\u4e32\uff08<code>String<\/code>\uff09\u7c7b\u4f3c\uff0c\u6240\u6709\u7684\u5305\u88c5\u7c7b\u5bf9\u8c61\u90fd\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u4e00\u65e6\u5305\u88c5\u7c7b\u5bf9\u8c61\u88ab\u521b\u5efa\uff0c\u5b83\u7684\u503c\u5c31\u4e0d\u80fd\u88ab\u66f4\u6539\u3002\u5982\u679c\u9700\u8981\u6539\u53d8\u503c\uff0c\u5219\u5fc5\u987b\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">java\u590d\u5236\u4ee3\u7801<code>Integer num = 10;\nnum = 20; \/\/ \u5b9e\u9645\u4e0a\u662f\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684 Integer \u5bf9\u8c61\n<\/code><\/pre>\n\n\n\n<p>\u6bcf\u6b21\u6539\u53d8\u5305\u88c5\u7c7b\u7684\u503c\uff0c\u5b9e\u9645\u4e0a\u662f\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u65e7\u7684\u5bf9\u8c61\u4f1a\u88ab\u5783\u573e\u56de\u6536\u673a\u5236\u5904\u7406\u6389\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e94\u3001\u5305\u88c5\u7c7b\u7684\u4f7f\u7528\u573a\u666f<\/h3>\n\n\n\n<p><strong>\u7f13\u5b58\u673a\u5236<\/strong> Java \u4e2d\u90e8\u5206\u5305\u88c5\u7c7b\uff08\u5982 <code>Integer<\/code>\u3001<code>Byte<\/code>\u3001<code>Short<\/code>\uff09\u5bf9\u67d0\u4e9b\u8303\u56f4\u5185\u7684\u503c\u8fdb\u884c\u4e86\u7f13\u5b58\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c<code>Integer<\/code> \u7f13\u5b58\u4e86 -128 \u5230 127 \u4e4b\u95f4\u7684\u6574\u6570\u5bf9\u8c61\u3002\u5f53\u4f60\u521b\u5efa\u4e00\u4e2a <code>Integer<\/code> \u5bf9\u8c61\u4e14\u503c\u5728\u8fd9\u4e2a\u8303\u56f4\u5185\u65f6\uff0c\u4e0d\u4f1a\u521b\u5efa\u65b0\u7684\u5bf9\u8c61\uff0c\u800c\u662f\u4ece\u7f13\u5b58\u4e2d\u8fd4\u56de\u5df2\u6709\u7684\u5bf9\u8c61\u3002java\u590d\u5236\u4ee3\u7801<code>Integer a = 127; Integer b = 127; System.out.println(a == b); \/\/ \u8f93\u51fa true<\/code><\/p>\n\n\n\n<p><strong>\u6cdb\u578b\u4e0e\u96c6\u5408\u6846\u67b6<\/strong> \u5728 Java \u7684\u96c6\u5408\u7c7b\u4e2d\uff0c\u5982 <code>ArrayList<\/code>\u3001<code>HashSet<\/code> \u7b49\uff0c\u4e0d\u80fd\u76f4\u63a5\u5b58\u50a8\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5fc5\u987b\u4f7f\u7528\u5305\u88c5\u7c7b\u3002\u4f8b\u5982\uff1ajava\u590d\u5236\u4ee3\u7801<code>ArrayList&lt;Double&gt; list = new ArrayList&lt;&gt;(); list.add(3.14); \/\/ \u81ea\u52a8\u88c5\u7bb1\uff0c\u5c06 double \u8f6c\u4e3a Double<\/code><\/p>\n\n\n\n<p><strong>\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u4f7f\u7528<\/strong> \u5f53\u9700\u8981\u5c06\u57fa<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u57fa\u672c\u6570\u636e\u7c7b\u578b Java \u63d0\u4f9b\u4e86\u516b\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u4eec\u7528\u4e8e\u5b58\u50a8\u7b80\u5355\u7684\u6570\u636e\u503c\u3002\u57fa\u672c\u6570\u636e\u7c7b\u578b\u662f\u503c\u7c7b\u578b\uff0c\u6570\u636e\u76f4\u63a5\u5b58 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56],"tags":[25,57],"class_list":["post-422","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-57"],"_links":{"self":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/422","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=422"}],"version-history":[{"count":1,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/422\/revisions"}],"predecessor-version":[{"id":423,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/422\/revisions\/423"}],"wp:attachment":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=422"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=422"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=422"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}