{"id":217,"date":"2026-07-14T20:40:00","date_gmt":"2026-07-14T12:40:00","guid":{"rendered":"http:\/\/ssjava.xyz\/index.php\/2026\/07\/14\/03-%e8%bf%90%e7%ae%97%e7%ac%a6%e4%b8%8e%e8%bf%9b%e5%88%b6%e8%af%a6%e8%a7%a3\/"},"modified":"2026-07-14T20:40:00","modified_gmt":"2026-07-14T12:40:00","slug":"03-%e8%bf%90%e7%ae%97%e7%ac%a6%e4%b8%8e%e8%bf%9b%e5%88%b6%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/ssjava.xyz\/index.php\/2026\/07\/14\/03-%e8%bf%90%e7%ae%97%e7%ac%a6%e4%b8%8e%e8%bf%9b%e5%88%b6%e8%af%a6%e8%a7%a3\/","title":{"rendered":"03. \u8fd0\u7b97\u7b26\u4e0e\u8fdb\u5236\u8be6\u89e3"},"content":{"rendered":"\n

\u4e0a\u7bc7\u6211\u4eec\u628a 8 \u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u53d8\u91cf\u58f0\u660e\u641e\u6e05\u695a\u4e86\uff0c\u6570\u636e\u5728\u53d8\u91cf\u91cc\u5c31\u662f\u8981\u62ff\u6765\u7528\u7684\u3002\u8fd9\u4e00\u7bc7\u5148\u8bb2\u8fd0\u7b97\u7b26<\/strong>\u2014\u2014\u4ece\u52a0\u51cf\u4e58\u9664\u5230\u81ea\u589e\u81ea\u51cf\uff0c\u4ece\u77ed\u8def\u903b\u8f91\u5230\u4e09\u5143\u8868\u8fbe\u5f0f\uff0c\u5916\u52a0\u9762\u8bd5\u5fc5\u8003\u7684\u539f\u7801\u53cd\u7801\u8865\u7801\u3002\u8fd9\u4e9b\u770b\u4f3c\u57fa\u7840\u7684\u4e1c\u897f\uff0c\u5751\u6bd4\u4f60\u60f3\u7684\u591a\u3002<\/p>\n\n\n\n

\u4e00\u3001\u7b97\u672f\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n

\u5148\u6765\u4e2a\u5168\u5bb6\u798f\uff1a<\/p>\n\n\n\n

\u8fd0\u7b97\u7b26<\/th>\u542b\u4e49<\/th>\u793a\u4f8b<\/th>\u7ed3\u679c<\/th><\/tr><\/thead>
+<\/code><\/td>\u52a0<\/td>5 + 3<\/code><\/td>8<\/td><\/tr>
-<\/code><\/td>\u51cf<\/td>5 - 3<\/code><\/td>2<\/td><\/tr>
*<\/code><\/td>\u4e58<\/td>5 * 3<\/code><\/td>15<\/td><\/tr>
\/<\/code><\/td>\u9664<\/td>5 \/ 3<\/code><\/td>1\uff08\u6574\u6570\u9664\u6cd5\u622a\u65ad\uff01\uff09<\/td><\/tr>
%<\/code><\/td>\u53d6\u6a21\uff08\u53d6\u4f59\uff09<\/td>5 % 3<\/code><\/td>2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

1.1 \u6574\u6570\u9664\u6cd5\u7684\u9677\u9631<\/h3>\n\n\n\n

\u4e0a\u4e00\u7bc7\u63d0\u8fc7\uff0c\u4e24\u4e2a\u6574\u6570\u76f8\u9664\u7ed3\u679c\u8fd8\u662f\u6574\u6570\uff1a<\/p>\n\n\n\n

System.out.println(7 \/ 3);    \/\/ 2\uff0c\u4e0d\u662f 2.333...\nSystem.out.println(7.0 \/ 3);  \/\/ 2.3333333333333335\nSystem.out.println(7 \/ 3.0);  \/\/ 2.3333333333333335<\/code><\/pre>\n\n\n\n
\u53ea\u8981\u64cd\u4f5c\u6570\u4e2d\u6709\u4e00\u4e2a\u662f\u6d6e\u70b9\u6570\uff0cJava \u5c31\u4f1a\u81ea\u52a8\u505a\u6d6e\u70b9\u6570\u9664\u6cd5\u3002<\/p>\n\n\n\n
1.2 \u53d6\u6a21\u8fd0\u7b97\u7b26 %<\/h3>\n\n\n\n
%<\/code> \u5f97\u5230\u7684\u662f\u4f59\u6570<\/strong>\uff0c\u7528\u9014\u5f88\u5e7f\uff1a<\/p>\n\n\n\n
\/\/ \u5224\u65ad\u5947\u5076\nint num = 17;\nSystem.out.println(num % 2 == 0 ? \"\u5076\u6570\" : \"\u5947\u6570\");  \/\/ \u5947\u6570\n\n\/\/ \u5bf9\u8d1f\u6570\u53d6\u6a21\u7684\u7ed3\u679c\u7b26\u53f7\u4e0e\u88ab\u9664\u6570\u76f8\u540c\nSystem.out.println(7 % 3);   \/\/ 1\nSystem.out.println(-7 % 3);  \/\/ -1\nSystem.out.println(7 % -3);  \/\/ 1<\/code><\/pre>\n\n\n\n
\n\n
\ud83d\udc1b \u9762\u8bd5\u9ad8\u9891\uff1a<\/strong>a % b<\/code> \u7684\u7ed3\u679c\u7b26\u53f7\u4e0e a<\/code> \u76f8\u540c\u3002\u8fd9\u4e2a\u95ee\u9898\u5728\u5b9e\u73b0\u5faa\u73af\u6570\u7ec4\u3001\u54c8\u5e0c\u8868\u7b49\u573a\u666f\u4f1a\u51fa\u73b0\uff0c\u6709\u516c\u53f8\u628a\u5b83\u5f53\u7b14\u8bd5\u9898\u8003\u3002<\/p>\n\n<\/blockquote>\n\n\n\n
1.3 \u5b57\u7b26\u4e32\u62fc\u63a5\u7684 + \u53f7<\/h3>\n\n\n\n
+<\/code> \u5728 Java \u91cc\u662f\u4e2a”\u53cc\u91cd\u8eab\u4efd”\u7684\u8fd0\u7b97\u7b26\u2014\u2014\u4e24\u8fb9\u90fd\u662f\u6570\u5b57\u65f6\u505a\u52a0\u6cd5\uff0c\u6709\u4e00\u8fb9\u662f String \u65f6\u5c31\u505a\u62fc\u63a5\uff1a<\/p>\n\n\n\n
System.out.println(1 + 2 + \"Java\");   \/\/ \"3Java\"\uff08\u4ece\u5de6\u5230\u53f3\uff0c\u5148\u7b97\u52a0\u6cd5\uff09\nSystem.out.println(\"Java\" + 1 + 2);   \/\/ \"Java12\"\uff08\u9047\u5230 String \u540e\u7684 + \u5168\u53d8\u62fc\u63a5\uff09\nSystem.out.println(1 + (2 + \"Java\")); \/\/ \"12Java\"\uff08\u62ec\u53f7\u6539\u53d8\u4f18\u5148\u7ea7\uff09<\/code><\/pre>\n\n\n\n
\u4f60\u770b\u51fa\u89c4\u5f8b\u4e86\u5417\uff1f\u4ece\u5de6\u5230\u53f3\u6267\u884c\uff0c\u53ea\u8981\u9047\u5230\u5b57\u7b26\u4e32\uff0c\u540e\u9762\u7684 + \u5c31\u53d8\u6210\u4e86\u62fc\u63a5\u7b26\u3002<\/strong><\/p>\n\n\n\n
\u4e8c\u3001\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
\u6700\u57fa\u672c\u7684 =<\/code> \u4f60\u5df2\u7ecf\u89c1\u8fc7\u4e86\u3002Java \u8fd8\u63d0\u4f9b\u4e86\u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u7b26<\/strong>\uff0c\u628a\u7b97\u672f\u548c\u8d4b\u503c\u5408\u5e76\uff1a<\/p>\n\n\n\n
int x = 10;\nx += 5;      \/\/ \u76f8\u5f53\u4e8e x = x + 5  \u2192 15\nx -= 3;      \/\/ \u76f8\u5f53\u4e8e x = x - 3  \u2192 12\nx *= 2;      \/\/ \u76f8\u5f53\u4e8e x = x * 2  \u2192 24\nx \/= 4;      \/\/ \u76f8\u5f53\u4e8e x = x \/ 4  \u2192 6\nx %= 3;      \/\/ \u76f8\u5f53\u4e8e x = x % 3  \u2192 0<\/code><\/pre>\n\n\n\n
\u590d\u5408\u8d4b\u503c\u4e0d\u4ec5\u6709\u5199\u6cd5\u7b80\u6d01\u7684\u597d\u5904\uff0c\u8fd8\u6709\u4e00\u4e2a\u9690\u5f0f\u7684\u7c7b\u578b\u8f6c\u6362<\/strong>\u7279\u6027\uff1a<\/p>\n\n\n\n
byte b = 10;\nb = b + 5;     \/\/ \u274c \u7f16\u8bd1\u62a5\u9519\uff01b + 5 \u7684\u7ed3\u679c\u662f int\uff0c\u4e0d\u80fd\u76f4\u63a5\u8d4b\u7ed9 byte\nb += 5;        \/\/ \u2705 \u7f16\u8bd1\u901a\u8fc7\uff01\u590d\u5408\u8d4b\u503c\u81ea\u5e26\u9690\u5f0f\u5f3a\u8f6c\uff08\u76f8\u5f53\u4e8e b = (byte)(b + 5)\uff09<\/code><\/pre>\n\n\n\n
\n\n
\ud83d\udca1 \u539f\u7406<\/strong>\uff1aE1 op= E2<\/code> \u7b49\u4ef7\u4e8e E1 = (T)((E1) op (E2))<\/code>\uff0c\u5176\u4e2d T \u662f E1 \u7684\u7c7b\u578b\u3002\u6240\u4ee5 b += 5<\/code> \u4f1a\u81ea\u52a8\u5f3a\u8f6c\u56de byte\u3002<\/p>\n\n<\/blockquote>\n\n\n\n
\u4e09\u3001\u81ea\u589e\u81ea\u51cf\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
\u4e0d\u7ba1\u662f\u5199\u5faa\u73af\u8fd8\u662f\u505a\u8ba1\u6570\uff0c++<\/code> \u548c --<\/code> \u90fd\u7528\u5f97\u6781\u5176\u9891\u7e41\u3002\u5b83\u4eec\u7684\u552f\u4e00\u4f5c\u7528\u5c31\u662f\u8ba9\u53d8\u91cf\u7684\u503c +1 \u6216 -1\u3002<\/p>\n\n\n\n
\u5173\u952e\u5728\u4e8e\u524d\u7f6e\u548c\u540e\u7f6e\u7684\u533a\u522b<\/strong>\uff1a<\/p>\n\n\n\n
int a = 5;\nint b = a++;      \/\/ \u540e\u7f6e++\uff1a\u5148\u4f7f\u7528 a \u7684\u5f53\u524d\u503c\uff085\uff09\u8d4b\u503c\u7ed9 b\uff0c\u7136\u540e a \u81ea\u589e\u4e3a 6\nSystem.out.println(a);  \/\/ 6\nSystem.out.println(b);  \/\/ 5\n\nint c = 5;\nint d = ++c;      \/\/ \u524d\u7f6e++\uff1a\u5148\u5c06 c \u81ea\u589e\u4e3a 6\uff0c\u7136\u540e\u628a 6 \u8d4b\u503c\u7ed9 d\nSystem.out.println(c);  \/\/ 6\nSystem.out.println(d);  \/\/ 6<\/code><\/pre>\n\n\n\n
\u4e00\u53e5\u8bdd\u53e3\u8bc0\uff1a“\u5148\u53d6\u503c\u540e\u81ea\u589e”\uff08\u540e\u7f6e\uff09\uff0c”\u5148\u81ea\u589e\u540e\u53d6\u503c”\uff08\u524d\u7f6e\uff09\u3002<\/strong><\/p>\n\n\n\n
\u9762\u8bd5\u91cc\u7ecf\u5e38\u8fd9\u6837\u8003\uff1a<\/p>\n\n\n\n
int i = 0;\nfor (int j = 0; j < 5; j++) {\n    i = i++;\n}\nSystem.out.println(i);  \/\/ \u731c\u731c\u7ed3\u679c\uff1f<\/code><\/pre>\n\n\n\n
\u7b54\u6848\u662f 0<\/strong>\u3002\u56e0\u4e3a i = i++<\/code> \u7684\u6267\u884c\u987a\u5e8f\u662f\uff1a\u5148\u7528\u4e34\u65f6\u53d8\u91cf\u4fdd\u5b58 i \u7684\u503c\uff080\uff09\u2192 i \u81ea\u589e\u4e3a 1 \u2192 \u518d\u628a\u4e34\u65f6\u53d8\u91cf\u7684\u503c\uff080\uff09\u8d4b\u503c\u7ed9 i\u3002\u6240\u4ee5\u5faa\u73af\u8dd1\u5b8c i \u8fd8\u662f 0\u3002\u8fd9\u5728\u65b0\u624b\u9762\u8bd5\u4e2d\u662f\u4e2a\u7ecf\u5178\u9677\u9631\uff0c\u5f88\u591a\u4eba\u60f3\u5f53\u7136\u5730\u8ba4\u4e3a\u662f 5\u3002<\/p>\n\n\n\n
\u56db\u3001\u5173\u7cfb\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
\u5173\u7cfb\u8fd0\u7b97\u7b26\u7528\u6765\u6bd4\u8f83\u4e24\u4e2a\u503c\u7684\u5927\u5c0f\u6216\u76f8\u7b49\u5173\u7cfb\uff0c\u7ed3\u679c\u6c38\u8fdc\u662f boolean<\/strong>\uff08true \/ false\uff09\uff1a<\/p>\n\n\n\n
int a = 10, b = 20;\n\nSystem.out.println(a == b);   \/\/ false  \u7b49\u4e8e\nSystem.out.println(a != b);   \/\/ true   \u4e0d\u7b49\u4e8e\nSystem.out.println(a > b);    \/\/ false  \u5927\u4e8e\nSystem.out.println(a = b);   \/\/ false  \u5927\u4e8e\u7b49\u4e8e\nSystem.out.println(a <= b);   \/\/ true   \u5c0f\u4e8e\u7b49\u4e8e<\/code><\/pre>\n\n\n\n
\u26a0\ufe0f \u5343\u4e07\u522b\u628a == \u5199\u6210 =<\/strong>\uff1a<\/p>\n\n\n\n
\/\/ \u7ecf\u5178 bug\nint x = 5;\nif (x = 10) {   \/\/ \u274c \u7f16\u8bd1\u62a5\u9519\uff01Java \u4e2d if \u8981\u6c42 boolean\uff0c\u800c x = 10 \u7684\u7ed3\u679c\u662f int\n    \/\/ ...\n}\n\n\/\/ \u4f46\u5982\u679c\u662f boolean \u7c7b\u578b\u2026\nboolean flag = false;\nif (flag = true) {  \/\/ \ud83d\udea8 \u4e0d\u4f1a\u62a5\u9519\uff01\u4f46 flag = true \u662f\u8d4b\u503c\u8868\u8fbe\u5f0f\uff0c\u7ed3\u679c\u5c31\u662f true\n    \/\/ \u8fd9\u6bb5\u4ee3\u7801\u6c38\u8fdc\u4f1a\u6267\u884c\uff01\u8fd9\u662f\u8001 C \u7a0b\u5e8f\u5458\u5e38\u72af\u7684\u9519\u8bef\n}<\/code><\/pre>\n\n\n\n
Java \u6bd4 C \u8bed\u8a00\u66f4\u5b89\u5168\u2014\u2014\u5b83\u5bf9\u6761\u4ef6\u8868\u8fbe\u5f0f\u505a\u4e86\u7c7b\u578b\u68c0\u67e5\uff0cint \u4e0d\u80fd\u76f4\u63a5\u5f53 boolean \u7528\u3002\u4f46 boolean \u7c7b\u578b\u7684\u53d8\u91cf\u8d4b\u503c\u4ecd\u7136\u53ef\u80fd\u8e29\u5751\u3002\u5efa\u8bae\u517b\u6210\u4e60\u60ef\uff1a\u628a\u5e38\u91cf\u5199\u524d\u9762<\/strong>\uff0c\u5373 if (true == flag)<\/code>\uff0c\u8fd9\u6837\u5c11\u5199\u4e00\u4e2a = \u5c31\u4f1a\u7f16\u8bd1\u62a5\u9519\u3002<\/p>\n\n\n\n
\u4e94\u3001\u903b\u8f91\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
\u8fd0\u7b97\u7b26<\/th>\u540d\u79f0<\/th>\u793a\u4f8b<\/th>\u7ed3\u679c<\/th><\/tr><\/thead>
&&<\/code><\/td>\u77ed\u8def\u4e0e<\/td>true && false<\/code><\/td>false<\/td><\/tr>
||<\/code><\/td>\u77ed\u8def\u6216<\/td>true || false<\/code><\/td>true<\/td><\/tr>
!<\/code><\/td>\u975e<\/td>!true<\/code><\/td>false<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
5.1 \u77ed\u8def\u7684\u542b\u4e49<\/h3>\n\n\n\n
“\u77ed\u8def”\u662f\u903b\u8f91\u8fd0\u7b97\u7b26\u6700\u6838\u5fc3\u7684\u7279\u6027\u2014\u2014\u53ea\u8981\u7ed3\u679c\u5df2\u7ecf\u786e\u5b9a\uff0c\u540e\u9762\u7684\u8868\u8fbe\u5f0f\u5c31\u4e0d\u518d\u8ba1\u7b97<\/strong>\uff1a<\/p>\n\n\n\n
int a = 5, b = 10;\n\n\/\/ && \u77ed\u8def\uff1a\u5de6\u8fb9\u4e3a false\uff0c\u53f3\u8fb9\u4e0d\u6267\u884c\nboolean result1 = (a > 10) && (b++ > 0);\nSystem.out.println(b);      \/\/ 10\uff08b++ \u6ca1\u88ab\u6267\u884c\uff01\uff09\n\n\/\/ || \u77ed\u8def\uff1a\u5de6\u8fb9\u4e3a true\uff0c\u53f3\u8fb9\u4e0d\u6267\u884c\nboolean result2 = (a  0);\nSystem.out.println(b);      \/\/ 10\uff08b++ \u4ecd\u7136\u6ca1\u88ab\u6267\u884c\uff09<\/code><\/pre>\n\n\n\n\u9762\u8bd5\u9898\u5b9e\u6218\uff1a<\/strong><\/p>\n\n\n\n
int i = 0, j = 0;\nboolean r = (i++ > 0) && (j++ > 0);\nSystem.out.println(i + \", \" + j);  \/\/ \u731c\u731c\uff1f \u2192 1, 0\n\n\/\/ i++ > 0 \u2192 0 > 0 \u2192 false\uff0ci \u53d8\u6210 1\n\/\/ \u56e0\u4e3a && \u77ed\u8def\uff0cj++ \u6ca1\u88ab\u6267\u884c\uff0cj \u4ecd\u7136\u662f 0<\/code><\/pre>\n\n\n\n
5.2 & \u548c |\uff08\u4e0d\u77ed\u8def\u7248\u672c\uff09<\/h3>\n\n\n\n
&<\/code> \u548c |<\/code> \u65e2\u662f\u4f4d\u8fd0\u7b97\u7b26<\/strong>\uff08\u5bf9\u6574\u6570\u505a\u4f4d\u8fd0\u7b97\uff09\uff0c\u4e5f\u53ef\u4ee5\u5f53\u903b\u8f91\u8fd0\u7b97\u7b26<\/strong>\uff08\u4e24\u8fb9\u662f boolean \u65f6\uff09\uff0c\u4f46\u4e0d\u4f1a\u77ed\u8def<\/strong>\uff1a<\/p>\n\n\n\n
int a = 5, b = 10;\n\nboolean r1 = (a > 10) & (b++ > 0);  \/\/ & \u4e0d\u77ed\u8def\uff0c\u4e24\u8fb9\u90fd\u7b97\nSystem.out.println(b);              \/\/ 11\uff08b++ \u6267\u884c\u4e86\uff09\n\nboolean r2 = (a > 10) && (b++ > 0); \/\/ && \u77ed\u8def\uff0c\u53f3\u8fb9\u4e0d\u7b97\nSystem.out.println(b);              \/\/ 11\uff08\u6ca1\u518d\u81ea\u589e\uff09<\/code><\/pre>\n\n\n\n
\u65e5\u5e38\u5f00\u53d1\u4e2d\u6c38\u8fdc\u4f18\u5148\u7528 && \u548c ||<\/strong>\u3002\u7528 & \u548c | \u505a\u903b\u8f91\u5224\u65ad\u7684\u552f\u4e00\u573a\u666f\u662f\uff1a\u4f60\u786e\u5b9e\u9700\u8981<\/strong>\u4e24\u8fb9\u90fd\u8981\u6267\u884c\uff08\u8fd9\u79cd\u60c5\u51b5\u6781\u5c11\uff0c\u4e14\u901a\u5e38\u7528\u66f4\u6e05\u6670\u7684\u4ee3\u7801\u66ff\u4ee3\uff09\u3002<\/p>\n\n\n\n
\u516d\u3001\u4e09\u5143\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
Java \u91cc\u552f\u4e00\u7684\u4e09\u76ee\u8fd0\u7b97\u7b26\uff0c\u8bed\u6cd5\uff1a<\/p>\n\n\n\n
\u7c7b\u578b \u53d8\u91cf = (\u6761\u4ef6\u8868\u8fbe\u5f0f) ? \u503c1 : \u503c2;<\/code><\/pre>\n\n\n\n
\u6761\u4ef6\u4e3a true \u8fd4\u56de\u503c1\uff0c\u5426\u5219\u8fd4\u56de\u503c2\uff1a<\/p>\n\n\n\n
int age = 18;\nString result = (age >= 18) ? \"\u6210\u5e74\u4eba\" : \"\u672a\u6210\u5e74\u4eba\";\nSystem.out.println(result);  \/\/ \u6210\u5e74\u4eba\n\n\/\/ \u4e09\u5143\u8fd0\u7b97\u7b26\u53ef\u4ee5\u5d4c\u5957\uff0c\u4f46\u4e0d\u5efa\u8bae\u2014\u53ef\u8bfb\u6027\u592a\u5dee\nint score = 85;\nString grade = score >= 90 ? \"\u4f18\u79c0\"\n              : score >= 80 ? \"\u826f\u597d\"\n              : score >= 60 ? \"\u53ca\u683c\"\n              : \"\u4e0d\u53ca\u683c\";\nSystem.out.println(grade);   \/\/ \u826f\u597d<\/code><\/pre>\n\n\n\n
\u4e09\u5143\u8fd0\u7b97\u7b26\u7684\u672c\u8d28\u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f<\/strong>\uff0c\u6709\u8fd4\u56de\u503c\uff0c\u53ef\u4ee5\u5d4c\u5957\u5728\u53e6\u4e00\u4e2a\u8868\u8fbe\u5f0f\u4e2d\u3002\u4f46\u5d4c\u5957\u8d85\u8fc7\u4e24\u5c42\u5efa\u8bae\u6362\u6210 if-else\uff0c\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u6bd4\u4ee3\u7801\u957f\u5ea6\u91cd\u8981\u5f97\u591a\u3002<\/p>\n\n\n\n
\u9644\uff1a\u539f\u7801\u3001\u53cd\u7801\u3001\u8865\u7801\u8be6\u89e3<\/h2>\n\n\n\n
\u8fd9\u4e00\u8282\u672c\u6765\u53ef\u4ee5\u5355\u72ec\u5f00\u4e00\u7bc7\uff0c\u4f46\u56e0\u4e3a\u548c\u4f4d\u8fd0\u7b97\u5173\u7cfb\u6700\u5bc6\u5207\uff0c\u653e\u5728\u8fd9\u91cc\u4e00\u8d77\u8bb2\u4e86\u3002\u5f88\u591a\u521d\u5b66\u8005\u5728\u8fd9\u91cc\u5c31\u653e\u5f03\u4e86\uff0c\u4f46\u5176\u5b9e\u7406\u89e3\u8fd9\u4e09\u4e2a\u6982\u5ff5\u5bf9\u7406\u89e3 Java \u5982\u4f55\u5904\u7406\u6574\u6570\u81f3\u5173\u91cd\u8981\u3002<\/p>\n\n\n\n
\u4e3a\u4ec0\u4e48\u9700\u8981\u8fd9\u4e09\u79cd\u7801\uff1f<\/h3>\n\n\n\n
\u8ba1\u7b97\u673a\u91cc\u6240\u6709\u6570\u636e\u6700\u7ec8\u90fd\u662f\u4e8c\u8fdb\u5236\u2014\u20140 \u548c 1\u3002\u4f46\u8d1f\u6570\u600e\u4e48\u8868\u793a<\/strong>\uff1f\u7528\u6700\u9ad8\u4f4d\uff08\u7b26\u53f7\u4f4d\uff09\u8868\u793a\u6b63\u8d1f\uff1f\u90a3 0 \u600e\u4e48\u529e\uff1f\u51cf\u6cd5\u600e\u4e48\u5904\u7406\uff1f<\/p>\n\n\n\n
\u5de5\u7a0b\u5e08\u4eec\u60f3\u51fa\u4e86\u8865\u7801\u7684\u89e3\u51b3\u65b9\u6848\u2014\u2014\u7528\u8865\u7801\u8868\u793a\u8d1f\u6570\uff0c\u53ef\u4ee5\u628a\u51cf\u6cd5\u7edf\u4e00\u6210\u52a0\u6cd5<\/strong>\uff0c\u786c\u4ef6\u5b9e\u73b0\u5c31\u7b80\u5355\u591a\u4e86\u3002<\/p>\n\n\n\n
\u9010\u4e2a\u51fb\u7834<\/h3>\n\n\n\n
\u4ee5 byte<\/code> \u7c7b\u578b\uff081\u5b57\u8282\uff0c8\u4f4d\uff09\u4e3a\u4f8b\uff1a<\/p>\n\n\n\n
\u6982\u5ff5<\/th>\u5b9a\u4e49<\/th>\u793a\u4f8b\uff08\u4ee5 -5 \u4e3a\u4f8b\uff09<\/th><\/tr><\/thead>
\u539f\u7801<\/strong><\/td>\u6700\u9ad8\u4f4d\u7b26\u53f7\u4f4d\uff080\u6b631\u8d1f\uff09\uff0c\u5176\u4f59\u4f4d\u662f\u6570\u503c\u7684\u4e8c\u8fdb\u5236<\/td>1000 0101<\/code><\/td><\/tr>
\u53cd\u7801<\/strong><\/td>\u6b63\u6570\u4e0d\u53d8\uff0c\u8d1f\u6570\uff1a\u7b26\u53f7\u4f4d\u4e0d\u53d8\uff0c\u5176\u4f59\u4f4d\u53d6\u53cd<\/td>1111 1010<\/code><\/td><\/tr>
\u8865\u7801<\/strong><\/td>\u6b63\u6570\u4e0d\u53d8\uff0c\u8d1f\u6570\uff1a\u53cd\u7801 + 1<\/td>1111 1011<\/code><\/td><\/tr><\/tbody><\/table>\n\n\n\n
\u6b63\u6570\u7684\u539f\u7801\u3001\u53cd\u7801\u3001\u8865\u7801\u662f\u4e00\u6837\u7684<\/strong>\u3002\u6b63\u6570 5\uff1a\u539f\u7801 0000 0101<\/code> = \u53cd\u7801 0000 0101<\/code> = \u8865\u7801 0000 0101<\/code>\u3002<\/p>\n\n\n\n
\u8d1f\u6570\u7684\u5173\u7cfb\u94fe\uff1a<\/strong><\/p>\n\n\n\n
    \n
  1. \u5199\u51fa\u6b63\u6570\u7684\u4e8c\u8fdb\u5236\uff08\u539f\u7801\uff09<\/li>\n
  2. \u7b26\u53f7\u4f4d\u53d8 1\uff0c\u5f97\u5230\u8d1f\u6570\u7684\u539f\u7801<\/strong><\/li>\n
  3. \u7b26\u53f7\u4f4d\u4e0d\u53d8\uff0c\u5176\u4ed6\u4f4d\u53d6\u53cd \u2192 \u53cd\u7801<\/strong><\/li>\n
  4. \u53cd\u7801 + 1 \u2192 \u8865\u7801<\/strong><\/li>\n<\/ol>\n\n\n\n
    \u4e3a\u4ec0\u4e48 byte \u7684\u8303\u56f4\u662f -128 ~ 127\uff1f<\/h3>\n\n\n\n
    \u770b\u8865\u7801\u7684\u5168\u666f\u56fe\u5c31\u61c2\u4e86\uff1a<\/p>\n\n\n\n
    \u8865\u7801<\/th>\u503c<\/th><\/tr><\/thead>
    0000 0000<\/code><\/td>0<\/td><\/tr>
    0000 0001<\/code><\/td>1<\/td><\/tr>
    …<\/td>…<\/td><\/tr>
    0111 1111<\/code><\/td>127\uff08\u6700\u5927\u6b63\u6570\uff09<\/td><\/tr>
    1000 0000<\/code><\/td>-128<\/strong>\uff08\u6700\u5c0f\u8d1f\u6570\uff09<\/td><\/tr>
    1000 0001<\/code><\/td>-127<\/td><\/tr>
    …<\/td>…<\/td><\/tr>
    1111 1111<\/code><\/td>-1<\/td><\/tr><\/tbody><\/table>\n\n\n\n
    \u6ce8\u610f 1000 0000<\/code> \u7528\u6765\u8868\u793a -128\uff0c\u800c\u4e0d\u662f -0\uff080 \u7684\u8865\u7801\u53ea\u6709\u4e00\u4e2a 0000 0000<\/code>\uff09\u3002\u6240\u4ee5 byte \u80fd\u8868\u793a 256 \u4e2a\u6570\uff1a-128 ~ 127\u3002\u540c\u7406 int<\/code> \u7684 -2\u00b3\u00b9 ~ 2\u00b3\u00b9-1 \u4e5f\u662f\u8fd9\u4e48\u6765\u7684\u3002<\/p>\n\n\n\n
    \u8865\u7801\u7684\u5b9e\u9645\u5e94\u7528\uff1a\u51cf\u6cd5\u53d8\u52a0\u6cd5<\/h3>\n\n\n\n
    \u8ba1\u7b97 5 - 3<\/code>\uff0c\u8ba1\u7b97\u673a\u5185\u90e8\u662f 5 + (-3)<\/code>\uff1a<\/p>\n\n\n\n
      5 \u7684\u8865\u7801\uff1a0000 0101\n -3 \u7684\u8865\u7801\uff1a1111 1101\uff083 \u2192 0000 0011 \u2192 \u53d6\u53cd 1111 1100 \u2192 +1 \u2192 1111 1101\uff09\n  \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  \u7ed3\u679c\uff1a    1 0000 0010\n\n  \u9ad8\u4f4d\u6ea2\u51fa\u4e22\u5f03\uff0c\u5f97\u5230 0000 0010 = 2 \u2705<\/code><\/pre>\n\n\n\n
    \u4e00\u4e2a\u52a0\u6cd5\u5668\u5c31\u641e\u5b9a\u4e86\u51cf\u6cd5\u3002\u8fd9\u5c31\u662f\u8865\u7801\u8bbe\u8ba1\u7684\u7cbe\u5999\u4e4b\u5904\u2014\u2014\u4e0d\u9700\u8981\u989d\u5916\u7684\u51cf\u6cd5\u7535\u8def\u3002<\/p>\n\n\n\n
    \u4f4d\u8fd0\u7b97\uff08\u4f60\u4f1a\u7528\u4e0a\u8865\u7801\u77e5\u8bc6\u7684\u5730\u65b9\uff09<\/h3>\n\n\n\n
    Java \u63d0\u4f9b\u4e86\u51e0\u4e2a\u4f4d\u8fd0\u7b97\u7b26\uff0c\u64cd\u4f5c\u7684\u662f\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u4f4d\uff08\u8865\u7801\uff09\uff1a<\/p>\n\n\n\n
    \u8fd0\u7b97\u7b26<\/th>\u540d\u79f0<\/th>\u793a\u4f8b<\/th>\u7ed3\u679c\uff08\u4e8c\u8fdb\u5236\uff09<\/th><\/tr><\/thead>
    &<\/code><\/td>\u6309\u4f4d\u4e0e<\/td>5 & 3<\/code><\/td>0000 0101 & 0000 0011 = 0000 0001<\/code>\uff081\uff09<\/td><\/tr>
    |<\/code><\/td>\u6309\u4f4d\u6216<\/td>5 | 3<\/code><\/td>0000 0101 | 0000 0011 = 0000 0111<\/code>\uff087\uff09<\/td><\/tr>
    ^<\/code><\/td>\u6309\u4f4d\u5f02\u6216<\/td>5 ^ 3<\/code><\/td>0000 0101 ^ 0000 0011 = 0000 0110<\/code>\uff086\uff09<\/td><\/tr>
    ~<\/code><\/td>\u6309\u4f4d\u53d6\u53cd<\/td>~5<\/code><\/td>~0000 0101 = 1111 1010<\/code>\uff08-6\uff09<\/td><\/tr><\/tbody><\/table>\n\n\n\n
    \/\/ \u5e38\u7528\u6280\u5de7\uff1a\u7528 & \u5224\u65ad\u5947\u5076\uff08\u6548\u7387\u6bd4 % \u9ad8\u4e00\u70b9\u70b9\uff09\nint num = 7;\nSystem.out.println((num & 1) == 0 ? \"\u5076\u6570\" : \"\u5947\u6570\");  \/\/ \u5947\u6570\n\n\/\/ \u5f02\u6216\u7684\u5c0f\u7279\u6027\uff1aa ^ b ^ b = a\uff08\u540c\u6570\u5f02\u6216\u4e24\u6b21\u6062\u590d\u539f\u503c\uff09\nint cipher = 42;\nint key = 99;\nint encrypted = cipher ^ key;   \/\/ \u52a0\u5bc6\nint decrypted = encrypted ^ key; \/\/ \u89e3\u5bc6\uff1a42\nSystem.out.println(decrypted);  \/\/ 42<\/code><\/pre>\n\n\n\n
    \u4f4d\u8fd0\u7b97\u5728\u65e5\u5e38\u4e1a\u52a1\u5f00\u53d1\u4e2d\u4e0d\u5e38\u7528\uff08\u9664\u975e\u505a\u5e95\u5c42\u3001\u7f51\u7edc\u534f\u8bae\u3001\u6743\u9650\u63a7\u5236\u7b49\uff09\uff0c\u4f46\u9762\u8bd5\u4e2d\u7ecf\u5e38\u7528\u6765\u8003\u5bdf\u4e8c\u8fdb\u5236\u7406\u89e3\u6df1\u5ea6\u3002<\/p>\n\n\n\n
    \n\n\n\n
    \u7ed3\u8bed<\/h2>\n\n\n\n
    \u8fd9\u4e00\u7bc7\u6211\u4eec\u628a Java \u91cc\u7684\u8fd0\u7b97\u7b26\u90fd\u8fc7\u4e86\u4e00\u904d\uff1a\u7b97\u672f\u8fd0\u7b97\u7684\u6574\u6570\u622a\u65ad\u9677\u9631\u3001\u8d4b\u503c\u8fd0\u7b97\u7684\u9690\u5f0f\u5f3a\u8f6c\u3001\u81ea\u589e\u81ea\u51cf\u7684\u524d\u540e\u7f6e\u533a\u522b\u3001\u5173\u7cfb\u8fd0\u7b97\u7b26\u7684 == \u548c = \u7684\u7ecf\u5178 bug\u3001\u903b\u8f91\u8fd0\u7b97\u7684\u77ed\u8def\u673a\u5236\u3001\u4ee5\u53ca\u4e09\u5143\u8fd0\u7b97\u7b26\u7684\u7075\u6d3b\u8fd0\u7528\u3002\u6700\u540e\u8fd8\u6df1\u5165\u4e86\u4e00\u628a\u5b83\u5e95\u5c42\u7684\u539f\u7801\u53cd\u7801\u8865\u7801\u548c\u4f4d\u8fd0\u7b97\u2014\u2014\u4ee5\u540e\u4f60\u770b\u5230 -128<\/code> \u65f6\u5c31\u77e5\u9053\u5b83\u4ece\u54ea\u6765\u7684\u4e86\u3002<\/p>\n\n\n\n
    \u4e0b\u4e00\u7bc7\u6211\u4eec\u6765\u5543\u6d41\u7a0b\u63a7\u5236\u4e0e\u5206\u652f\u5faa\u73af\u8bed\u53e5<\/strong>\u2014\u2014if-else\u3001switch\u3001for\u3001while\uff0c\u8fd9\u4e9b\u4ee3\u7801\u903b\u8f91\u7684\u9aa8\u67b6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u4e0a\u7bc7\u6211\u4eec\u628a 8 \u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u53d8\u91cf\u58f0\u660e\u641e\u6e05\u695a\u4e86\uff0c\u6570\u636e\u5728\u53d8\u91cf\u91cc\u5c31\u662f\u8981\u62ff\u6765\u7528\u7684\u3002\u8fd9\u4e00\u7bc7\u5148\u8bb2\u8fd0\u7b97\u7b26\u2014\u2014\u4ece\u52a0\u51cf\u4e58\u9664\u5230 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,10],"tags":[],"class_list":["post-217","post","type-post","status-publish","format-standard","hentry","category-01-","category-javase"],"_links":{"self":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/217","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=217"}],"version-history":[{"count":0,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/217\/revisions"}],"wp:attachment":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=217"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=217"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}