{"id":62,"date":"2015-03-30T09:46:51","date_gmt":"2015-03-30T01:46:51","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=62"},"modified":"2026-08-18T12:09:24","modified_gmt":"2026-08-18T04:09:24","slug":"java%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e4%b8%8e%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=62","title":{"rendered":"Java\u6570\u636e\u7c7b\u578b\u4e0e\u7c7b\u578b\u8f6c\u6362"},"content":{"rendered":"
\n

Java \u662f\u5f3a\u7c7b\u578b<\/strong>\u8bed\u8a00\uff1a\u58f0\u660e\u53d8\u91cf\u5fc5\u987b\u5199\u660e\u6570\u636e\u7c7b\u578b\u3002\u53d8\u91cf\u5360\u4e00\u5757\u5185\u5b58\uff0c\u4e0d\u540c\u7c7b\u578b\u5360\u7684\u5927\u5c0f\u4e0d\u540c\u3002<\/p>\n

\u57fa\u672c\u7c7b\u578b\u4e00\u5171 8 \u79cd\uff1a4 \u79cd\u6574\u578b\u30012 \u79cd\u6d6e\u70b9\u578b\u30011 \u79cd\u5b57\u7b26\u578b\u30011 \u79cd\u5e03\u5c14\u578b\u3002\u5b83\u4eec\u4e4b\u95f4\u53ef\u4ee5\u81ea\u52a8\u63d0\u5347\uff0c\u4e5f\u53ef\u4ee5\u5f3a\u5236\u8f6c\u6362\uff0c\u4f46\u5f3a\u5236\u8f6c\u6362\u53ef\u80fd\u4e22\u7cbe\u5ea6\u3002<\/p>\n

<\/p>\n

\u4e00\u3001\u516b\u79cd\u57fa\u672c\u7c7b\u578b<\/h2>\n

\u6574\u578b\u65e5\u5e38\u7528 int<\/code>\uff1b\u7279\u522b\u5927\u7684\u6570\u7528 long<\/code>\uff08\u539f\u6587\u7528\u300c\u6295\u653e\u5e7f\u5c9b\u957f\u5d0e\u7684\u539f\u5b50\u5f39\u91ca\u653e\u80fd\u91cf\u300d\u6765\u5f62\u5bb9\u6570\u91cf\u7ea7\uff09\u3002byte<\/code>\u3001short<\/code> \u591a\u89c1\u4e8e\u5e95\u5c42\u6587\u4ef6\u5904\u7406\u3001\u6216\u8981\u538b\u5b58\u50a8\u7684\u5927\u6570\u7ec4\u3002<\/p>\n

Java \u6574\u578b\u957f\u5ea6\u4e0e\u5e73\u53f0\u65e0\u5173\uff0c\u6362\u673a\u5668\u4e0d\u7528\u6539\u7c7b\u578b\uff1bC\/C++ \u6574\u578b\u957f\u5ea6\u8ddf\u5e73\u53f0\u8d70\uff0c64 \u4f4d\u4e0a\u7a33\u5b9a\u7684\u7a0b\u5e8f\u642c\u5230 32 \u4f4d\u53ef\u80fd\u6ea2\u51fa\u3002Java \u6ca1\u6709\u65e0\u7b26\u53f7\u7c7b\u578b<\/strong>\uff08unsigned\uff09\u3002<\/p>\n

\u5b57\u9762\u91cf\uff1a\u516b\u8fdb\u5236\u524d\u7f00 0<\/code>\uff08010<\/code> \u7b49\u4e8e\u5341\u8fdb\u5236 8\uff09\uff1b\u5341\u516d\u8fdb\u5236 0x<\/code>\uff080xCAFE<\/code>\uff09\uff1bJava 7 \u8d77\u4e8c\u8fdb\u5236\u524d\u7f00 0b<\/code>\uff080b1001<\/code> \u7b49\u4e8e 9\uff09\uff0c\u4e5f\u53ef\u7528\u4e0b\u5212\u7ebf\u5206\u9694\u6570\u5b57\uff1a1_000_000<\/code>\uff0c\u7f16\u8bd1\u5668\u4f1a\u4e22\u6389\u4e0b\u5212\u7ebf\u3002<\/p>\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/th>\n\u4f4d\u6570<\/th>\n\u8981\u70b9<\/th>\n<\/tr>\n<\/thead>\n
byte \/ short \/ int \/ long<\/td>\n8 \/ 16 \/ 32 \/ 64<\/td>\n\u9ed8\u8ba4\u7528 int\uff1blong \u5b57\u9762\u91cf\u52a0 L<\/td>\n<\/tr>\n
float<\/td>\n32<\/td>\n\u5927\u7ea6 6\uff5e7 \u4f4d\u6709\u6548\u6570\u5b57\uff0c\u5b57\u9762\u91cf\u5fc5\u987b\u52a0 F\/f<\/td>\n<\/tr>\n
double<\/td>\n64<\/td>\n\u5927\u7ea6 15 \u4f4d\u6709\u6548\u6570\u5b57\uff1b\u4e0d\u5e26\u540e\u7f00\u7684\u5c0f\u6570\u9ed8\u8ba4\u5c31\u662f double<\/td>\n<\/tr>\n
char<\/td>\n16<\/td>\n\u5355\u5f15\u53f7\u4e00\u4e2a\u5b57\u7b26\uff0cUnicode<\/td>\n<\/tr>\n
boolean<\/td>\nJVM \u672a\u89c4\u5b9a<\/td>\n\u53ea\u6709 true \/ false\uff0c\u4e0d\u80fd\u5f53 0\/1 \u505a\u7b97\u672f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

float \u5fc5\u987b\u5e26 F<\/code> \u6216 f<\/code>\uff1afloat x = 223.56F;<\/code>\u3002double \u53ef\u5199 D<\/code>\/d<\/code>\uff0c\u4e0d\u5199\u4e5f\u884c\u3002\u591a\u6570\u60c5\u51b5\u76f4\u63a5\u7528 double\uff0cfloat \u7cbe\u5ea6\u7ecf\u5e38\u4e0d\u591f\u3002<\/p>\n

public class Demo {\n    public static void main(String[] args) {\n        char webName1 = '\u65b0';\n        char webName2 = '\u534e';\n        char webName3 = '\u82d1';\n        System.out.println(\"\u7f51\u7ad9\u7684\u540d\u5b57\u662f\uff1a\" + webName1 + webName2 + webName3);\n\n        short x = 22;     \/\/ \u5341\u8fdb\u5236\n        int y = 022;      \/\/ \u516b\u8fdb\u5236\uff0c\u7b49\u4e8e\u5341\u8fdb\u5236 18\n        long z = 0x22L;   \/\/ \u5341\u516d\u8fdb\u5236\uff0c\u7b49\u4e8e\u5341\u8fdb\u5236 34\n        System.out.println(\"\u8f6c\u5316\u6210\u5341\u8fdb\u5236\uff1ax = \" + x + \", y = \" + y + \", z = \" + z);\n\n        float m = 22.45f;\n        double n = 10;\n        System.out.println(\"\u8ba1\u7b97\u4e58\u79ef\uff1a\" + m + \" * \" + n + \"=\" + m * n);\n    }\n}\n\/\/ \u8fd0\u884c\u7ed3\u679c\uff1a\n\/\/ \u7f51\u7ad9\u7684\u540d\u5b57\u662f\uff1a\u65b0\u534e\u82d1\n\/\/ \u8f6c\u5316\u6210\u5341\u8fdb\u5236\uff1ax = 22, y = 18, z = 34\n\/\/ \u8ba1\u7b97\u4e58\u79ef\uff1a22.45 * 10.0=224.50000762939453<\/code><\/pre>\n
\u5373\u4f7f\u6d6e\u70b9\u770b\u8d77\u6765\u662f\u6574\u6570\uff0c\u6253\u5370\u65f6\u4e5f\u4f1a\u5e26\u5c0f\u6570\u70b9\u3002\u4e58\u79ef\u672b\u5c3e\u90a3\u4e00\u4e32\u662f float \u4e8c\u8fdb\u5236\u820d\u5165\u7684\u6b63\u5e38\u73b0\u8c61\uff0c\u4e0d\u662f\u6253\u5370\u5199\u9519\u3002<\/p>\n
\u4e8c\u3001\u5e03\u5c14\u578b\uff1a\u4e0d\u662f C \u8bed\u8a00\u7684 0 \u548c 1<\/h2>\n
C \u8bed\u8a00\u91cc\u6761\u4ef6\u6210\u7acb\u5e38\u5f97\u5230 1\u3001\u5426\u5219 0\uff0c\u53ef\u4ee5\u5f53\u6574\u6570\u7528\u3002Java \u7684\u6761\u4ef6\u7ed3\u679c\u662f true<\/code> \/ false<\/code>\uff0c\u72ec\u7acb\u6210\u4e00\u79cd\u7c7b\u578b\uff0c\u4e0d\u80fd\u548c int \u4e92\u76f8\u8d4b\u503c<\/strong>\u3002\u539f\u6587\u5199\u300ctrue \u7b49\u540c\u4e8e 1\u300d\u5bb9\u6613\u8bef\u5bfc\uff0c\u90a3\u662f C \u7684\u4e60\u60ef\uff0c\u4e0d\u662f Java \u7684\u89c4\u5219\u3002<\/p>\n
public class Demo {\n    public static void main(String[] args) {\n        boolean a = 100 > 10;\n        boolean b = 100 < 10;\n        System.out.println(\"100>10 = \" + a);\n        System.out.println(\"100<10 = \" + b);\n\n        if (a) {\n            System.out.println(\"100>10\u662f\u5bf9\u7684\");\n        } else {\n            System.out.println(\"100<10\u662f\u9519\u7684\");\n        }\n    }\n}\n\/\/ \u8fd0\u884c\u7ed3\u679c\uff1a\n\/\/ 100>10 = true\n\/\/ 100<10 = false\n\/\/ 100>10\u662f\u5bf9\u7684<\/code><\/pre>\n
\u539f\u6587\u628a\u6700\u540e\u4e00\u884c\u5370\u6210\u300c100<10\u662f\u5bf9\u7684\u300d\uff0c\u548c if (a)<\/code> \u5bf9\u4e0d\u4e0a\uff0c\u5df2\u6309\u4ee3\u7801\u6539\u6b63\u3002<\/p>\n
\u4e09\u3001\u81ea\u52a8\u8f6c\u6362\u4e0e\u5f3a\u5236\u8f6c\u6362<\/h2>\n
\u81ea\u52a8\u8f6c\u6362\u5728\u8fd0\u7b97\u4e2d\u6084\u6084\u53d1\u751f\uff0c\u4e00\u822c\u4ece\u4f4d\u6570\u4f4e\u7684\u7c7b\u578b\u5347\u5230\u9ad8\u7684\uff1b\u5f3a\u5236\u8f6c\u6362\u5fc5\u987b\u5728\u4ee3\u7801\u91cc\u5199 (\u7c7b\u578b)<\/code>\uff0c\u65b9\u5411\u4e0d\u9650\uff0c\u4f46\u53ef\u80fd\u4e22\u7cbe\u5ea6\u3002<\/p>\n
\u81ea\u52a8\u63d0\u5347\u987a\u5e8f\uff1abyte, short, char \u2192 int \u2192 long \u2192 float \u2192 double<\/code>\u3002\u4e0d\u540c\u7c7b\u6570\u636e\u5148\u5bf9\u9f50\u518d\u8fd0\u7b97\uff1a\u4e24\u4e2a\u64cd\u4f5c\u6570\u91cc\u300c\u66f4\u5bbd\u300d\u7684\u90a3\u4e2a\u51b3\u5b9a\u7ed3\u679c\u7c7b\u578b\uff1bbyte\/short\/char \u5355\u72ec\u8fd0\u7b97\u4f1a\u5148\u5347\u6210 int\u3002<\/p>\n
public class Demo {\n    public static void main(String[] args) {\n        int x;\n        double y;\n        x = (int) 34.56 + (int) 11.2;     \/\/ \u622a\u6210 34 + 11 = 45\uff0c\u4e22\u7cbe\u5ea6\n        y = (double) x + (double) 10 + 1; \/\/ 45.0 + 10.0 + 1 \u2192 56.0\n        System.out.println(\"x=\" + x);\n        System.out.println(\"y=\" + y);\n    }\n}\n\/\/ \u8fd0\u884c\u7ed3\u679c\uff1a\n\/\/ x=45\n\/\/ y=56.0<\/code><\/pre>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u516b\u79cd\u57fa\u672c\u7c7b\u578b\u957f\u5ea6\u4e0e\u5e73\u53f0\u65e0\u5173\uff1b\u5c0f\u6570\u9ed8\u8ba4 double\u3001boolean \u53ea\u6709 true\/false\uff1b\u4f4e\u5230\u9ad8\u53ef\u81ea\u52a8\u5347\uff0c\u53cd\u5411\u5fc5\u987b\u5f3a\u5236\u8f6c\u5e76\u63a5\u53d7\u53ef\u80fd\u4e22\u7cbe\u5ea6\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
Java \u662f\u5f3a\u7c7b\u578b\u8bed\u8a00\uff1a\u58f0\u660e\u53d8\u91cf\u5fc5\u987b\u5199\u660e\u6570\u636e\u7c7b\u578b\u3002\u53d8\u91cf\u5360\u4e00\u5757\u5185\u5b58\uff0c\u4e0d\u540c\u7c7b\u578b\u5360\u7684\u5927\u5c0f\u4e0d\u540c\u3002 \u57fa\u672c\u7c7b\u578b\u4e00\u5171 8 \u79cd […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[15],"tags":[30],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/62"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=62"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/62\/revisions"}],"predecessor-version":[{"id":2370,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/62\/revisions\/2370"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=62"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=62"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=62"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}