{"id":655,"date":"2022-02-18T23:22:32","date_gmt":"2022-02-18T15:22:32","guid":{"rendered":"https:\/\/axinyi.xuenixiang.com\/?p=655"},"modified":"2022-02-18T23:23:24","modified_gmt":"2022-02-18T15:23:24","slug":"javase-2","status":"publish","type":"post","link":"https:\/\/axinyi.xuenixiang.com\/index.php\/2022\/02\/18\/javase-2\/","title":{"rendered":"JavaSE-\u7b2c\u4e8c\u7ae0"},"content":{"rendered":"\n<h1>\u7b2c\u4e8c\u7ae0 java\u57fa\u7840\u8bed\u6cd5<\/h1>\n\n\n\n<h2>2.1 \u7eb2\u8981<\/h2>\n\n\n\n<ul><li>\u6807\u8bc6\u7b26<\/li><li>\u5173\u952e\u5b57<\/li><li>\u6570\u636e\u7c7b\u578b<\/li><li>\u8fd0\u7b97\u7b26<\/li><li>\u63a7\u5236\u8bed\u53e5<\/li><li>\u65b9\u6cd5\u7684\u521b\u5efa\u4e0e\u4f7f\u7528<\/li><li>\u9012\u5f52\u95ee\u9898<\/li><\/ul>\n\n\n\n<h3>2.1.1 \u6807\u8bc6\u7b26<\/h3>\n\n\n\n<ul><li>\u6807\u8bc6\u7b26\uff1a\u5c31\u662f\u7ed9\u7c7b\u3001\u65b9\u6cd5\u3001\u53c2\u6570\u8d77\u540d\u5b57<\/li><\/ul>\n\n\n\n<ol><li>java\u6807\u8bc6\u7b26\u7684\u89c4\u5219<ul><li>\u6807\u8bc6\u7b26\uff1a\u6570\u5b57\u3001\u5b57\u6bcd\u3001\u4e0b\u5212\u7ebf\u3001\u7f8e\u5143\u7b26\u53f7\uff0c\u5176\u4ed6\u7684\u90fd\u4e0d\u53ef\u4ee5<\/li><li>\u6570\u5b57\u4e0d\u80fd\u4f5c\u4e3a\u5f00\u5934\u4f7f\u7528<\/li><\/ul><\/li><li>\u5173\u952e\u5b57\u4e0d\u80fd\u4f5c\u4e3a\u6807\u8bc6\u7b26\u540d\u79f0\u4f7f\u7528<\/li><li>\u533a\u5206\u5927\u5c0f\u5199<\/li><li>\u7406\u8bba\u4e0a\u6ca1\u6709\u957f\u5ea6\u9650\u5236<\/li><\/ol>\n\n\n\n<p>\u6848\u4f8b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5408\u6cd5\u6807\u8bc6\u7b26<\/th><th>\u975e\u6cd5\u6807\u8bc6\u7b26<\/th><\/tr><\/thead><tbody><tr><td>_abc<\/td><td>3abc \u6570\u5b57\u4e0d\u80fd\u5f00\u5934<\/td><\/tr><tr><td>HelloWorld<\/td><td>hello-world \u4f7f\u7528\u4e86\u4e2d\u5212\u7ebf<\/td><\/tr><tr><td>public2<\/td><td>public \u5173\u952e\u5b57<\/td><\/tr><tr><td><\/td><td>hello world \u4f7f\u7528\u4e86\u7a7a\u683c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>\u6807\u8bc6\u7b26\u547d\u540d\u65f6\u6700\u597d\"\u89c1\u540d\u77e5\u610f\"\uff0c\u5982\u679c\u4e24\u4e2a\u5355\u8bcd\u7ec4\u6210\u7684\u540d\u79f0\uff0c\u90a3\u4e48\u7b2c\u4e8c\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u5fc5\u987b\u5927\u5199\u3002\u8fd9\u79cd\u547d\u540d\u65b9\u5f0f\u79f0\u4e3a\"\u9a7c\u5cf0\u5f0f\u547d\u540d\"<\/strong><\/p>\n\n\n\n<h3>2.1.2 \u5173\u952e\u5b57<\/h3>\n\n\n\n<ul><li>\u6ce8\u610f\uff1a\u90fd\u662f\u5c0f\u5199\u7684<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>class<\/th><th>extends<\/th><th>implements<\/th><th>interface<\/th><th>import<\/th><\/tr><\/thead><tbody><tr><\/tr><tr><td>package<\/td><td>break<\/td><td>case<\/td><td>continue<\/td><td>default<\/td><\/tr><tr><td>do<\/td><td>if<\/td><td>else<\/td><td>for<\/td><td>return<\/td><\/tr><tr><td>switch<\/td><td>while<\/td><td>false<\/td><td>true<\/td><td>null<\/td><\/tr><tr><td>boolean<\/td><td>byte<\/td><td>char<\/td><td>short<\/td><td>int<\/td><\/tr><tr><td>long<\/td><td>float<\/td><td>double<\/td><td>try<\/td><td>catch<\/td><\/tr><tr><td>throw<\/td><td>throws<\/td><td>finally<\/td><td>abstact<\/td><td>final<\/td><\/tr><tr><td>native<\/td><td>private<\/td><td>protected<\/td><td>public<\/td><td>static<\/td><\/tr><tr><td>synchronized<\/td><td>thransinet<\/td><td>volative<\/td><td>instanceof<\/td><td>new<\/td><\/tr><tr><td>super<\/td><td>void<\/td><td>assert<\/td><td>enum<\/td><td><strong>goto\u4fdd\u7559\u5b57<\/strong><\/td><\/tr><tr><td><strong>const\u4fdd\u7559\u5b57<\/strong><\/td><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2>2.2 \u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n<h3>2.2.1 \u5206\u4e3a\u4e24\u7c7b<\/h3>\n\n\n\n<ul><li>\u57fa\u672c\u7c7b\u578b(8\u79cd)\uff1a<ul><li>\u6570\u5b57\u7c7b\u578b<ul><li>\u6574\u578b\uff1abyte\u3001short\u3001int\u3001long<\/li><li>\u6d6e\u70b9\uff1afloat\u3001double<\/li><\/ul><\/li><li>\u5b57\u7b26\u7c7b\u578b\uff1achar<\/li><li>\u5e03\u5c14\u7c7b\u578b\uff1aboolean(true|flase)<\/li><\/ul><\/li><li>\u5f15\u7528\u7c7b\u578b(3\u79cd)\uff1a<ul><li>\u7c7b<\/li><li>\u6570\u7ec4<\/li><li>\u63a5\u53e3<\/li><\/ul><\/li><\/ul>\n\n\n\n<h3>2.2.2 8\u79cd\u6570\u636e\u7c7b\u578b\u7684\u8303\u56f4<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"1024\" height=\"448\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-20-1024x448.png\" alt=\"\" class=\"wp-image-656\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-20-1024x448.png 1024w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-20-300x131.png 300w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-20-768x336.png 768w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-20.png 1115w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul><li>\u4e00\u4e2a\u5b57\u8282\u53608\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u75280\u8865\u4f4d\uff0c\u4f8b\u5982\uff1a00000001<\/li><li>\u7b14\u8bd5\u9898\uff1abyte i = 127; i+1&lt;1\u662f\u5426\u6210\u7acb<\/li><li>\u7b54\uff1a\u6210\u7acb\uff0c\u56e0\u4e3a\u6bcf\u79cd\u7c7b\u578b\u90fd\u6709\u53d6\u503c\u8303\u56f4\uff0c<strong>\u8d85\u51fa\u8303\u56f4\u5c31\u4f1a\u53d6\u53cd<\/strong>\u3002<\/li><\/ul>\n\n\n\n<h2>2.3 \u5b57\u8282\u7f16\u7801<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>\u5b57\u7b26\u7f16\u7801<\/th><th>\u5bf9\u5e94\u7684\u7f16\u7801\u65b9\u5f0f<\/th><\/tr><\/thead><tbody><tr><td>ISO-8859-1<\/td><td>\u4e5f\u79f0\u4e3alatin-1;\u4e3b\u8981\u7528\u4e8e\u897f\u6b27\u8bed\u8a00<\/td><\/tr><tr><td>GB2312\/GBK\/GB18030<\/td><td>\u7528\u4e8e\u6c49\u5b57\u7684\u7f16\u7801<\/td><\/tr><tr><td>unicode<\/td><td>\u5168\u7403\u7edf\u4e00\u7f16\u7801utf-8\uff0cutf-16\uff0cutf-32<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul><li>utf-8\u662f\u4e09\u4e2a\u5b57\u8282\u5904\u7406\u4e2d\u6587\u7684\uff0c\u6548\u7387\u9ad8\uff0c\u8282\u7701\u7a7a\u95f4<\/li><li>\u6c49\u5b57\u7684\u8f6c\u6362<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"794\" height=\"517\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-21.png\" alt=\"\" class=\"wp-image-657\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-21.png 794w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-21-300x195.png 300w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-21-768x500.png 768w\" sizes=\"(max-width: 794px) 100vw, 794px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-22.png\" alt=\"\" class=\"wp-image-658\" width=\"836\" height=\"129\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-22.png 688w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-22-300x46.png 300w\" sizes=\"(max-width: 836px) 100vw, 836px\" \/><\/figure>\n\n\n\n<ul><li>\u6bcf\u4e2a\u4e2d\u6587\u6c49\u5b57\u90fd\u5bf9\u5e94\u4e00\u4e2aascii\u7801<\/li><\/ul>\n\n\n\n<h2>2.4 \u521b\u5efa\u5b57\u7b26<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>public class HelloWorld {\n\n    public static void main(String&#91;] args){\n\t\t\/\/\u5b57\u7b26\u4f7f\u7528\u5355\u5f15\u53f7\n\t\tchar param = '\u4e2d'\n        System.out.println(param);\n    }\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-23.png\" alt=\"\" class=\"wp-image-659\" width=\"839\" height=\"189\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-23.png 583w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-23-300x67.png 300w\" sizes=\"(max-width: 839px) 100vw, 839px\" \/><\/figure>\n\n\n\n<h2>2.5 \u53d8\u91cf<\/h2>\n\n\n\n<ul><li>\u53d8\u91cf\u5c31\u662fjava\u4e2d\u4e00\u4e2a\u6700\u57fa\u672c\u7684\u5355\u5143\uff1b\u5305\u542b4\u4e2a\u5c5e\u6027\uff1a<ul><li>\u53d8\u91cf\u7684\u7c7b\u578b\uff1a\u57fa\u672c\u7c7b\u578b\u6216\u5f15\u7528\u7c7b\u578b\u90fd\u53ef\u4ee5<\/li><li>\u53d8\u91cf\u540d\u79f0\uff1a\u7b26\u5408\u6807\u8bc6\u7b26\u5373\u53ef<\/li><li>\u53d8\u91cf\u7684\u503c\uff1a\u5982\u679c\u662f\u57fa\u672c\u7c7b\u578b\u5c31\u662f\u5177\u4f53\u7684\u503c\uff0c\u5982\u679c\u662f\u5f15\u7528\u7c7b\u578b\u5c31\u662f\u5185\u5b58\u5730\u5740<\/li><li>\u53d8\u91cf\u7684\u5b58\u50a8\u5355\u5143\uff1a\u6839\u636e\u4e0d\u540c\u7684\u7c7b\u578b\u51b3\u5b9a\u5728\u5185\u5b58\u4e2d\u5f00\u8f9f\u7a7a\u95f4\u7684\u5927\u5c0f(1byte=8\u4f4d)<\/li><\/ul><\/li><li>\u521b\u5efa\u4e00\u4e2a\u53d8\u91cf<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u4e86\u4e00\u4e2a\u53d8\u91cf\n        int i = 10\uff1b\n    }\n}<\/code><\/pre>\n\n\n\n<h2>2.6 \u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n<h3>2.6.1 \u6574\u578b<\/h3>\n\n\n\n<ul><li>\u5206\u4e3a\uff1abyte\u3001short\u3001int\u3001long<\/li><li>\u8868\u793a\u7684\u65b9\u5f0f\uff1a<ul><li>\u5341\u8fdb\u5236\uff1a1\uff0c2\uff0c3...<\/li><li>\u516b\u8fdb\u5236\uff1a\u4ee50\u5f00\u5934\uff1b012<\/li><li>\u5341\u516d\u8fdb\u5236\uff1a\u4ee50x\u5f00\u5934\uff1b0x123<\/li><\/ul><\/li><li>\u5728java\u4e2d\u6574\u578b\u7684\u9ed8\u8ba4\u7c7b\u578b\u5c31\u662fint<\/li><li>\u5982\u679c\u4f7f\u7528\u957f\u6574\u578b\uff1a10L(\u5927\u5c0f\u5199\u5747\u53ef)<\/li><\/ul>\n\n\n\n<h3>2.6.2 \u6d6e\u70b9<\/h3>\n\n\n\n<ul><li>\u6d6e\u70b9\u7c7b\u578b\uff1a\u5355\u7cbe\u5ea6float\uff1b\u53cc\u7cbe\u5ea6double<\/li><li>java\u4e2d\u9ed8\u8ba4\u7cbe\u5ea6\u7c7b\u578b\u662f\uff1adouble<\/li><li>\u6848\u4f8b\uff1a<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-24.png\" alt=\"\" class=\"wp-image-660\" width=\"839\" height=\"314\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-24.png 816w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-24-300x112.png 300w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-24-768x287.png 768w\" sizes=\"(max-width: 839px) 100vw, 839px\" \/><\/figure>\n\n\n\n<ul><li>\u6b63\u786e\u521b\u5efa\u5355\u7cbe\u5ea6<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u5355\u7cbe\u5ea6;\u5927\u5c0f\u5199\u5747\u53ef\n        float f = 2.0f;\n        float f1 = 2.0F;\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li><strong>\u7b14\u8bd5\u9898\uff1afloat\u548clong\u8c01\u5927\uff1f<\/strong><ul><li>\u7b54\uff1afloat\u5927\uff0c\u56e0\u4e3a\uff0c\u6570\u5b57\u7684\u5927\u5c0f\u4e0d\u662f\u6309\u7167\u5b57\u8282\u6570\u6bd4\u8f83\u7684<\/li><\/ul><\/li><\/ul>\n\n\n\n<h3>2.6.3 \u5e03\u5c14\u7c7b\u578b<\/h3>\n\n\n\n<ul><li><strong>boolean\u7c7b\u578b\uff1atrue;flase\uff0c\u53ea\u80fd\u4e3a\u8fd9\u4e24\u4e2a\u503c\uff0c\u4e0d\u80fd\u53d6\u5176\u4ed6\u7684\u503c<\/strong><\/li><li>\u6848\u4f8b\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u5e03\u5c14\u7c7b\u578b\n        boolean bo = true;\n        boolean bo1 = false;\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u9519\u8bef\u7684<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-25.png\" alt=\"\" class=\"wp-image-662\" width=\"841\" height=\"325\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-25.png 592w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-25-300x116.png 300w\" sizes=\"(max-width: 841px) 100vw, 841px\" \/><\/figure>\n\n\n\n<h3>2.6.4 \u57fa\u672c\u7c7b\u578b\u7684\u8f6c\u6362<\/h3>\n\n\n\n<ul><li>\u5728java\u4e2d\u57fa\u672c\u7c7b\u578b\u53ef\u4ee5\u8f6c\u6362\uff0c\u4f46\u662f\uff0cboolean\u7c7b\u578b\u6bd4\u8f83\u7279\u6b8a\u4e0d\u80fd\u4e0e\u5176\u4ed6\u7c7b\u578b\u8f6c\u6362\uff1b<\/li><li>\u7c7b\u578b\u8f6c\u6362\u5206\u4e3a\uff1a<ul><li>\u9ed8\u8ba4\u8f6c\u6362\uff1a\u5c0f\u7c7b\u578b\u8f6c\u5927\u7c7b\u578b<\/li><li>\u5f3a\u5236\u8f6c\u6362\uff1a\u5927\u7c7b\u578b\u8f6c\u5c0f\u7c7b\u578b<\/li><\/ul><\/li><li>\u7c7b\u578b\u7531\u5c0f\u5230\u5927\u8f6c\u6362\uff1a<ul><li>byte-&gt;short-&gt;int-&gt;long-&gt;float-&gt;double<\/li><li><strong>\u6ce8\u610f\uff1abyte\u3001short\u3001char\u4e4b\u95f4\u4e0d\u4f1a\u76f8\u4e92\u8f6c\u6362\uff0c\u9996\u5148\u8f6c\u4e3aint\u540e\u518d\u8f6c\u6362<\/strong><\/li><li><strong>\u6ce8\u610f\uff1a\u53ea\u8981\u4e0d\u8d85\u51fa\u8303\u56f4\uff0c\u6574\u578b\u53ef\u4ee5\u76f4\u63a5\u8d4b\u503c\u7ed9byte\u3001short\u3001char<\/strong><\/li><\/ul><\/li><li><strong>\u603b\u7ed3\uff1a\u591a\u79cd\u7c7b\u578b\u6df7\u5408\u8fd0\u7b97\u7684\u8fc7\u7a0b\u4e2d\uff0c\u8fd4\u56de\u6700\u5927\u7684\u7c7b\u578b<\/strong><\/li><li>\u6848\u4f8b\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53c2\u6570\n        byte b = 100;\n        \n        \/\/byte a = 1000; \u9519\u8bef\uff0c\u8d85\u51fa\u8303\u56f4\n        \n        \/\/short b = 1000; \u9519\u8bef\uff0c\u53d8\u91cf\u4e0d\u80fd\u540c\u540d\n        \n        short d = 1000; \/\/\u6b63\u786e\n        \n        int c = 1000; \/\/\u6b63\u786e\n        \n        long e = c; \/\/\u6b63\u786e\uff1b\u56e0\u4e3aint\u6bd4long\u5c0f\uff0c\u9ed8\u8ba4\u5c31\u53ef\u4ee5\u8f6c\u6362\u4e86\n\n        \/\/int f = e; \/\/\u9519\u8bef\uff1b\u56e0\u4e3along\u6bd4int\u5927\uff0c\u8d85\u51fa\u8303\u56f4\u4e86\uff0c\u5b58\u5728\u7cbe\u5ea6\u4e22\u5931\n        int f = (int)e; \/\/\u6b63\u786e\uff1b\u53ef\u4ee5\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b2\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class HelloWorld {\n\n    public static void main(String&#91;] args){\n\t\tint i = 10\/3; \/\/\u6b63\u786e\u7684\n\t\t\n\t\tlong n = 10; \/\/\u6b63\u786e\u7684\n\t\t\n\t\t\/\/int f = n\/3; \/\/\u9519\u8bef;\u8fd4\u56de\u7684\u662flong\u7c7b\u578b\n\t\t\n\t\tint f = (int)n\/3; \/\/\u6b63\u786e\uff0c\u53ef\u4ee5\u628along\u5f3a\u5236\u8f6c\u4e3aint\u7c7b\u578b\n\t\t\n\t\t\/\/byte h = (byte)n\/3; \/\/\u9519\u8bef\uff1b\u8fd4\u56de\u7684\u662fint\u7c7b\u578b\n\t\t\n\t\tbyte h = (byte)(n\/3); \/\/\u6b63\u786e\n\t\t\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b3\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class HelloWorld{\n    \n    public static void main(String&#91;] args){\n        short k = 10;\n        \n        short k1 = k+1; \/\/\u9519\u8bef\uff0c\u56e0\u4e3a\u9700\u8981\u8f6c\u4e3aint\u540e\u5728\u8fd0\u7b97\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b4\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class HelloWorld{\n    \n    public static void main(String&#91;] args){\n        \/\/\u6b63\u786e\uff1achar\u8f6c\u4e3aint\u540e\u5728\u8fd0\u7b97\n        char f = 'a';\n        int n = f+100;\n        System.out.println(n);\n    }\n}<\/code><\/pre>\n\n\n\n<h2>2.7 \u8fd0\u7b97\u7b26<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>\u7b97\u672f\u8fd0\u7b97\u7b26<\/th><th>+\uff0c-\uff0c*\uff0c\/\uff0c++\uff0c--\uff0c%<\/th><\/tr><\/thead><tbody><tr><td>\u5173\u7cfb\u8fd0\u7b97\u7b26<\/td><td>&lt;,&lt;=,&gt;,&gt;=,==,!=<\/td><\/tr><tr><td>\u5e03\u5c14\u8fd0\u7b97\u7b26<\/td><td>&amp;&amp;,||,&amp;,|,!<\/td><\/tr><tr><td>\u4f4d\u8fd0\u7b97\u7b26(\u4e8c\u8fdb\u5236)\u4e86\u89e3\u5373\u53ef<\/td><td>&amp;,|,~\uff0c^,&gt;&gt;,&gt;&gt;&gt;,&lt;&lt;&amp;,\u6309\u4f4d\u4e0e(AND)[\u771f\u771f\u4e3a\u771f\uff0c\u771f\u5047\u4e3a\u5047]|\u6309\u4f4d\u6216(OR)[\u5047\u5047\u4e3a\u5047,\u5176\u4f59\u5168\u771f]^\u6309\u4f4d\u5f02[\u76f8\u540c\u4e3a\u5047,\u4e0d\u540c\u4e3a\u771f]~\u6309\u4f4d\u975e\uff08NOT\uff09[\u771f\u5219\u5047,\u5047\u5219\u771f]&gt;&gt;\u53f3\u79fb&gt;&gt;&gt;\u53f3\u79fb\uff0c\u5de6\u8fb9\u7a7a\u51fa\u7684\u4f4d\u4ee50\u586b\u5145&lt;&lt;\u5de6\u79fb<\/td><\/tr><tr><td>\u8d4b\u503c\u7c7b\u8fd0\u7b97\u7b26<\/td><td>=,+=,-=,*=,\/=,%=<\/td><\/tr><tr><td>\u5b57\u7b26\u4e32\u8fde\u63a5\u8fd0\u7b97\u7b26<\/td><td>+<\/td><\/tr><tr><td>\u6761\u4ef6\u8fd0\u7b97\u7b26<\/td><td>?:<\/td><\/tr><tr><td>\u5176\u4ed6\u8fd0\u7b97\u7b26<\/td><td>instanceof,new<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3>2.7.1 \u7b97\u672f\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n<ul><li>\u6848\u4f8b1\uff1a++\u5c31\u662f\u81ea\u8eab\u52a0\u4e00<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo{\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        int i = 10;\n        i++; \/\/\u81ea\u8eab\u52a0\u4e00\n        System.out.println(i);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b2\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo{\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        int i = 10;\n        \/\/++\u5728\u540e\u8868\u793a\u5148\u8d4b\u503c\uff0c\u81ea\u8eab\u518d\u52a0\u4e00\n        int n = i++;\n        System.out.println(i);\n        System.out.println(n);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b3\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo{\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        int i = 10;\n        \/\/++\u5728\u524d\u8868\u793a\u81ea\u8eab\u5148\u52a0\u4e00\u5728\u8d4b\u503c\n        int n = ++i;\n        System.out.println(i);\n        System.out.println(n);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b4\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo{\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        int i = 10;\n        \/\/i++\u76f8\u7b49\u4e8ei=i+1\n        i = i+1;\n        System.out.println(i);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b5\uff1a<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-26.png\" alt=\"\" class=\"wp-image-663\" width=\"840\" height=\"344\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-26.png 743w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-26-300x123.png 300w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        short i = 10;\n        \/\/\u6b63\u786e\uff1b\u63a8\u8350\u4f7f\u7528 +=\u3001-=\uff0c*=\uff0c\/=\u3001\u56e0\u4e3a\uff0c\u3010\u53ef\u4ee5\u81ea\u52a8\u8f6c\u4e3a\u63a5\u6536\u7684\u7c7b\u578b\u3011\n        i += 1;\n        System.out.println(i);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b6\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        int i = 10;\n        i \/= 3;\n        System.out.println(i);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u6848\u4f8b7\uff1a\u53d6\u6a21<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        int i = 10;\n        int n = 1%3; \/\/\u5c31\u662f\u53d6\u4f59\u6570\n        System.out.println(n);\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528\u573a\u666f\uff1a\u5c31\u662f\u5206\u9875\u7684\u4f7f\u7528<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"859\" height=\"502\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-28.png\" alt=\"\" class=\"wp-image-665\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-28.png 859w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-28-300x175.png 300w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-28-768x449.png 768w\" sizes=\"(max-width: 859px) 100vw, 859px\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Demo {\n    public static void main(String&#91;] args){\n        \/\/\u603b\u8bb0\u5f55\u6570\n        int total = 20;\n        \/\/\u6bcf\u9875\u663e\u793a9\u6761\n        int pageSize = 9;\n        \/\/\u603b\u9875\u7801\n        int pages = 1;\n        if (total%pageSize==0){\n            pages = total\/pageSize;\n        }else {\n            pages = total\/pageSize+1;\n        }\n        System.out.println(\"\u603b\u9875\u7801=\"+pages);\n    }\n}<\/code><\/pre>\n\n\n\n<h3>2.7.2 \u5173\u7cfb\u8fd0\u7b97\u7b26\u4e0e\u5e03\u5c14\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n<ul><li>\u4e0e\uff1a\u4e24\u4e2a\u64cd\u4f5c\u6570\u76f8\u4e0e\uff0c\u5982\u679c\u90fd\u4e3atrue\u5219\u8fd4\u56detrue\uff0c\u5426\u5219\u8fd4\u56defalse<\/li><li>\u6216\uff1a\u4e24\u4e2a\u64cd\u4f5c\u6570\u76f8\u6216\uff0c\u53ea\u8981\u6709\u4e00\u4e2a\u4e3atrue\u5219\u8fd4\u56detrue<\/li><li>\u975e\uff1a\u53d6\u53cd<\/li><li>\u5f02\u6216\uff1a\u76f8\u5f02\u4e3atrue\uff0c\u5c31\u662f\u4e24\u4e2a\u64cd\u4f5c\u6570\u4e0d\u540c(\u4e00\u4e2atrue\u4e00\u4e2afalse)<\/li><li>\u77ed\u8def\u4e0e&amp;&amp;\u548c\u903b\u8f91\u4e0e&amp;\u7684\u533a\u522b\uff1f<ul><li><strong>\u5b83\u4eec\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u76f8\u540c\u7684\uff0c\u53ea\u662f\u8fd0\u7b97\u7684\u8fc7\u7a0b\u4e0d\u76f8\u540c<\/strong><\/li><li>\u77ed\u8def\u4e0e\uff1a\u5982\u679c\u5de6\u8fb9\u4e3atrue\u90a3\u4e48\u8ba1\u7b97\u53f3\u8fb9\uff0c\u5426\u5219\u76f4\u63a5\u8fd4\u56deflase<\/li><li>\u903b\u8f91\u4e0e\uff1a\u65e0\u8bba\u5de6\u8fb9\u662f\u5426\u4e3atrue\u90fd\u8ba1\u7b97\u53f3\u8fb9\u540e\u518d\u8fd4\u56de\u7ed3\u679c<\/li><\/ul><\/li><li>\u77ed\u8def\u6216||\u548c\u903b\u8f91\u6216|\u7684\u533a\u522b\uff1f<ul><li><strong>\u5b83\u4eec\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u76f8\u540c\u7684\uff0c\u53ea\u662f\u8fd0\u7b97\u7684\u8fc7\u7a0b\u4e0d\u76f8\u540c<\/strong><\/li><\/ul><\/li><li>\u6ce8\u610f\uff1a\u77ed\u8def\u4e0e\u8981\u6c42\u4e24\u4fa7\u5fc5\u987b\u662f\u5e03\u5c14\u7c7b\u578b\uff0c\u800c\u903b\u8f91\u4e0e\u5e76\u4e0d\u8981\u6c42\u3002<\/li><li>\u7b14\u8bd5\u9898\uff1a4&amp;7=\uff1f<ul><li>\u7b54\uff1a\u8fd4\u56de4\uff0c\u56e0\u4e3a\u8f6c\u4e3a\u4e8c\u8fdb\u5236\u540e\u518d\u8fd0\u7b97\uff1b\u53ea\u67091\u9047\u52301\u8fd4\u56de1\uff0c\u5176\u4ed6\u90fd\u8fd4\u56de0<\/li><\/ul><\/li><\/ul>\n\n\n\n<h4>2.7.2.1 \u6848\u4f8b<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        \/\/\u521b\u5efa\u53d8\u91cf\n        boolean op1 = 10&gt;5;\n        boolean op2 = 10&lt;5;\n        \n        \/\/\u8f93\u51fa\n        System.out.println(\"op1=\" + op1);\n        System.out.println(\"op2=\" + op2);\n        \n        \/\/\u77ed\u8def\u4e0e\u4e0e\u903b\u8f91\u4e0e\n        System.out.println(\"op1&amp;&amp;op2=\"+(op1&amp;&amp;op2));\n        System.out.println(\"op1&amp;op2+=\"+(op1&amp;op2));\n        \n        \/\/\u77ed\u8def\u6216\u4e0e\u903b\u8f91\u6216\n        System.out.println(\"op1||op2=\"+(op1||op2));\n        System.out.println(\"op1|op2=\"+(op1|op2));\n        \n        \/\/\u53d6\u53cd\n        System.out.println(\"!op1=\"+!op1);\n        \n        \/\/\u5f02\u6216\n        System.out.println(\"op1^op2=\"+(op1^op2));\n        System.out.println(\"op1^op1=\"+(op1^op1));<\/code><\/pre>\n\n\n\n<h3>2.7.3 \u6761\u4ef6\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n<ul><li>\u4e09\u5143\u8fd0\u7b97\u7b26<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args) {\n        \/\/\u521b\u5efa\u53d8\u91cf\n        int i = 10;\n        \/\/\u4e09\u5143\u8fd0\u7b97\u7b26\n        int n = i&gt;30?1:-1;\n        System.out.println(n);\n        \n        \/\/\u4e09\u5143\u8fd0\u7b97\u7b26\n        boolean bo = i%3==0?true:false;\n        System.out.println(bo);\n    }\n}<\/code><\/pre>\n\n\n\n<h2>2.8 \u63a7\u5236\u8bed\u53e5<\/h2>\n\n\n\n<h3>2.8.1 \u5224\u65ad\u8bed\u53e5<\/h3>\n\n\n\n<h4>2.8.1.1 \u8bed\u6cd5<\/h4>\n\n\n\n<ul><li>if\u8bed\u53e5<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>if(\u5e03\u5c14\u7c7b\u578b){\n    \u4e00\u884c\u6216\u591a\u884c\u8bed\u53e5\n}\n\n\u5982\u679c\u53ea\u6709\u4e00\u884c\u8bed\u53e5\uff0c\u90a3\u4e48\u53ef\u4ee5\u7701\u7565\u5927\u62ec\u53f7\n\nif(\u5e03\u5c14\u7c7b\u578b)\n    \u4e00\u884c<\/code><\/pre>\n\n\n\n<ul><li>if-else\u8bed\u53e5<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>if(\u5e03\u5c14\u7c7b\u578b){\n    \u4e00\u884c\u6216\u591a\u884c\u8bed\u53e5\n}else{\n    \u4e00\u884c\u6216\u591a\u884c\u8bed\u53e5\n}<\/code><\/pre>\n\n\n\n<ul><li>if-else-if-else\uff1a\u6267\u884c\u7684\u6548\u7387\u9ad8\uff0c\u56e0\u4e3a\uff0c\u9047\u5230\u4e00\u4e2atrue\u5176\u4ed6\u5224\u65ad\u5c31\u88ab\u5ffd\u7565\u4e0d\u6267\u884c\u4e86<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>if(\u5e03\u5c14\u7c7b\u578b){\n    \u4e00\u884c\u6216\u591a\u884c\u8bed\u53e5\n}else if(\u5e03\u5c14\u7c7b\u578b){\n    \u4e00\u884c\u6216\u591a\u884c\u8bed\u53e5\n}else if(\u5e03\u5c14\u7c7b\u578b){\n    \u4e00\u884c\u6216\u591a\u884c\u8bed\u53e5\n}else{\n    \u4e00\u884c\u6216\u591a\u884c\u8bed\u53e5\n}<\/code><\/pre>\n\n\n\n<h4>2.8.1.2 \u6848\u4f8b\uff1a\u53ea\u4f7f\u7528if\uff0c\u8fd9\u79cd\u5224\u65ad\u7684\u6548\u7387\u4f4e<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int Age = 3;\n        if (Age&gt;0&amp;&amp;Age&lt;=5){\n            System.out.println(\"\u513f\u7ae5\");\n        }\n        \n        if (Age&gt;5&amp;&amp;Age&lt;=10){\n            System.out.println(\"\u5c0f\u5b66\u751f\");\n        }\n        \n        if (Age&gt;10&amp;&amp;Age&lt;=18){\n            System.out.println(\"\u4e2d\u5b66\u751f\");\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h4>2.8.1.3 \u6848\u4f8b\uff1a\u4f7f\u7528if-else if-else \u6548\u7387\u9ad8<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int Age = 3;\n        if (Age&gt;0&amp;&amp;Age&lt;=5){\n            System.out.println(\"\u513f\u7ae5\");\n        }else if (Age&gt;5&amp;&amp;Age&lt;=10){\n            System.out.println(\"\u5c0f\u5b66\u751f\");\n        }else if (Age&gt;10&amp;&amp;Age&lt;=18){\n            System.out.println(\"\u4e2d\u5b66\u751f\");\n        }else{\n            System.out.println(\"\u5927\u5b66\u751f\");\n        }\n   \t}\n}<\/code><\/pre>\n\n\n\n<h4>2.8.1.4 \u6848\u4f8b\uff1a\u4e24\u4e2a\u6dfb\u52a0\u5224\u65adif-else<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int Age = 3;\n        if (3%2==0){\n            System.out.println(\"\u5076\u6570\");\n        }else {\n            System.out.println(\"\u5947\u6570\");\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h3>2.8.2 switch\u5206\u652f\u8bed\u53e5<\/h3>\n\n\n\n<h4>2.8.2.1 \u683c\u5f0f<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>switch(\u8868\u8fbe\u5f0f){\n    case \u503c:\n        \u8bed\u53e5;\n        break;\n    case \u503c:\n        \u8bed\u53e5;\n        break;\n    case \u503c:\n        \u8bed\u53e5;\n        break;\n    default:\n        \u8bed\u53e5;\n        break;\n}<\/code><\/pre>\n\n\n\n<ul><li>\u8868\u8fbe\u5f0f\uff1abyte\u3001short\u3001int\u3001char\u3001String<\/li><li>break\uff1a\u63a8\u8350\u4f7f\u7528\uff1b\u5982\u679c\u7701\u7565\uff0c\u90a3\u4e48\u4ece\u3010\u7b26\u5408\u6761\u4ef6\u7684\u90a3\u4e00\u884c\u3011\u7a7f\u900f<\/li><li>\u5982\u679c\u6240\u6709\u6761\u4ef6\u90fd\u4e0d\u6ee1\u8db3\u6267\u884cdefault<\/li><\/ul>\n\n\n\n<h4>2.8.2.2 \u6848\u4f8b<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int key = 1;\n        switch(key){\n            case 0:\n                System.out.println(\"0\");\n                break;\n            case 1:\n                System.out.println(\"1\");\n                break;\n            case 2:\n                System.out.println(\"2\");\n                break;\n            case 3:\n                System.out.println(\"3\");\n                break;\n            default:\n                System.out.println(\"-1\");\n                break;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h4>2.8.2.3 \u4e0d\u6dfb\u52a0break\u90a3\u4e48\u4ece\u7b26\u5408\u6761\u4ef6\u7684\u90a3\u4e00\u884c\u5f00\u59cb\u7a7f\u900f<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int key = 1;\n        switch(key){\n            case 0:\n                System.out.println(\"0\");\n            case 1:\n                System.out.println(\"1\");\n            case 2:\n                System.out.println(\"2\");\n            case 3:\n                System.out.println(\"3\");\n            default:\n                System.out.println(\"-1\");\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u7b14\u8bd5\u9898\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int key = 1;\n        int\ti = 10;\n        \n        switch(key){\n            case 0:\n                i++;\n            case 1:\n                i+=10;\n            case 2:\n                i--;\n            case 3:\n                i++;\n        }\n        System.out.println(\"i=\"+i);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u7b14\u8bd5\u9898\uff1a\u8f93\u51fa-1\uff0c\u56e0\u4e3a\uff0cdefault\u4e0e\u4f4d\u7f6e\u65e0\u5173<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int key = 10;\n        switch(key){\n            default:\n                System.out.println(\"-1\");\n                break;\n            case 0:\n                System.out.println(\"0\");\n                break;\n            case 1:\n                System.out.println(\"1\");\n                break;\n            case 2:\n                System.out.println(\"2\");\n                break;\n            case 3:\n                System.out.println(\"3\");\n                break;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h3>2.8.3 for\u5faa\u73af<\/h3>\n\n\n\n<h4>2.8.3.1 \u683c\u5f0f<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>for(\u521d\u59cb\u5316;\u6761\u4ef6;\u6b65\u957f){\n    \u8bed\u53e5\n}<\/code><\/pre>\n\n\n\n<h4>2.8.3.2 \u6848\u4f8b<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        for(int i=0;i&lt;5;i++){\n            System.out.println(i);\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u7b14\u8bd5\u9898\uff1a\u662f\u5426\u53ef\u4ee5\u6267\u884c\uff1f\u7b54\uff1a\u8fd9\u662f\u4e00\u4e2a\u6b7b\u5faa\u73af<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        for(;;){\n            System.out.println(\"abc\");\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u5faa\u73af\u7684\u987a\u5e8f<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        for(int i=0;i&lt;5;i++){\n            System.out.println(i);\n        }\n    }\n}\n\n\u7b49\u4ef7\u4e8e\n    \npublic class TestDemo {\n    public static void main(String&#91;] args){\n        int i = 0;\n        for(;i&lt;5;){\n            System.out.println(i);\n            i++;\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-29.png\" alt=\"\" class=\"wp-image-666\" width=\"840\" height=\"1203\" srcset=\"https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-29.png 474w, https:\/\/axinyi.xuenixiang.com\/wp-content\/uploads\/2022\/02\/\u56fe\u7247-29-209x300.png 209w\" sizes=\"(max-width: 840px) 100vw, 840px\" \/><\/figure>\n\n\n\n<ul><li>\u7b14\u8bd5\u9898\uff1a\u6267\u884c\u9519\u8bef\uff0c\u56e0\u4e3a\uff0ci\u53d8\u91cf\u5c5e\u4e8efor\u7684\u8bed\u53e5\u5757<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        for(int i=0;i&lt;5;i++){\n            i+=1;\n        }\n        System.out.println(i);\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u7b14\u8bd5\u9898\uff1a\u4e66\u5199\u662f\u5426\u6b63\u786e\uff1f\u6b63\u786e<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        for(int i=0;i&lt;5;i++)\n\t\t\tSystem.out.println(i);\n    }\n}<\/code><\/pre>\n\n\n\n<h3>2.8.4 while\u5faa\u73af<\/h3>\n\n\n\n<h4>2.8.4.1 \u683c\u5f0f<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>while(\u5e03\u5c14\u7c7b\u578b){\n    \u8bed\u53e5;\n    \u9632\u6b62\u6b7b\u5faa\u73af;\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int i=0;\n        while(i&lt;5)\n\t\t\tSystem.out.println(i);\n\t\t\ti++;    \n    }\n}<\/code><\/pre>\n\n\n\n<h3>2.8.5 do-while\u5faa\u73af<\/h3>\n\n\n\n<ul><li>\u7279\u70b9\uff1a\u81f3\u5c11\u5faa\u73af\u4e00\u6b21<\/li><li>\u683c\u5f0f\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int i=0;\n        do{\n            System.out.println(i);\n\t\t\ti++;\n        }while(i&lt;5); \/\/\u5fc5\u987b\u6ce8\u610f\u7ed3\u675f\u4f7f\u7528\u5206\u53f7\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u7b14\u8bd5\u9898\uff1a\u8f93\u51fa5 5<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args){\n        int i=10,n=0;\n        do{\n            n++;\n\t\t\ti--;\n        }while(n&lt;5);\n        \n        System.out.println(i);\n        System.out.println(n);\n    }\n}<\/code><\/pre>\n\n\n\n<h3>2.8.6 \u8df3\u51fa\u5faa\u73af\u4f53<\/h3>\n\n\n\n<ul><li>break\uff1a\u8df3\u51fa\u5f53\u524d\u5faa\u73af\u4f53<\/li><li>continue\uff1a\u8df3\u51fa\u672c\u6b21\u5faa\u73af<\/li><li>return\uff1a\u8df3\u51fa\u6240\u6709\u5faa\u73af\u4f53\uff0c\u56e0\u4e3a\uff0c\u65b9\u6cd5\u5f39\u6808<\/li><\/ul>\n\n\n\n<h4>2.8.6.1 break<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args) {\n        for(int i = 0;i &lt; 5;i++)\n            if(i==2){\n                break;\n            }\n        \tSystem.out.println(i);\n    \t}\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u5d4c\u5957\u5faa\u73af<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args) {\n        for(int n = 0;n &lt; 5;n++){\n            for(int i = 0; i &lt; 5; i++){\n                if(i==2){\n                \tbreak;\n            \t}\n                System.out.println(i);\n            }\n        \tSystem.out.println(\"-------\u5916\u5c42-------\");\n    \t}\n    }\n}<\/code><\/pre>\n\n\n\n<ul><li>\u8df3\u51fa\u6240\u6709\u5faa\u73af<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args) {\n        \/\/\u521b\u5efa\u53d8\u91cf\n        boolean flag = false;\n        \n        for (int = 0; n &lt; 5; n++) {\n            if (flag) {\/\/\u8df3\u51fa\u5916\u5c42\n                break;\n            }\n            for (int i = 0; i &lt; 5; i++) {\n                if (i==2){\n                    flag = true;\n                    break;\n                }\n                System.out.println(i);\n            }\n            System.out.println(\"-------\u5916\u5c42-------\");\n        }\n        \n    }\n}<\/code><\/pre>\n\n\n\n<h4>2.8.6.2 continue<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args) {\n        for(int i = 0; i &lt; 5; i++) {\n            if (i==2){\n                continue;\n            }\n            System.out.println(i);\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<h4>2.8.6.3 return<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>public class TestDemo {\n    public static void main(String&#91;] args) {\n        \n        for(int n = 0; n &lt; 5; n++) {\n            for (int i = 0; i &lt; 5; i++) {\n                if (i==2){\n                    return; \/\/\u65b9\u6cd5\u5f39\u6808\n                }\n                System.out.println(i);\n            }\n            System.out.println(\"-------\u5916\u5c42-------\");\n        }\n        \n    }\n}<\/code><\/pre>\n\n\n\n<p><div class=\"has-toc have-toc\"><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b2c\u4e8c\u7ae0 java\u57fa\u7840\u8bed\u6cd5 2.1 \u7eb2\u8981 \u6807\u8bc6\u7b26 \u5173\u952e\u5b57 \u6570\u636e\u7c7b\u578b \u8fd0\u7b97\u7b26 \u63a7\u5236\u8bed\u53e5 \u65b9\u6cd5\u7684\u521b\u5efa\u4e0e\u4f7f\u7528 \u9012\u5f52\u95ee\u9898 2.1.1 \u6807\u8bc6\u7b26 &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[],"_links":{"self":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts\/655"}],"collection":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/comments?post=655"}],"version-history":[{"count":3,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts\/655\/revisions"}],"predecessor-version":[{"id":668,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/posts\/655\/revisions\/668"}],"wp:attachment":[{"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/media?parent=655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/categories?post=655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/axinyi.xuenixiang.com\/index.php\/wp-json\/wp\/v2\/tags?post=655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}