{"id":2596,"date":"2020-03-21T18:59:21","date_gmt":"2020-03-21T18:59:21","guid":{"rendered":"https:\/\/itteacheritfreelance.hk\/wordpress\/?p=2596"},"modified":"2020-04-26T17:06:09","modified_gmt":"2020-04-26T17:06:09","slug":"java-operator","status":"publish","type":"post","link":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/2020\/03\/21\/java-operator\/","title":{"rendered":"java \u6559\u80b2 \u5b66\u751f \u88dc\u7fd2>> \u904b\u7b97\u7b26\u865f(Operator)"},"content":{"rendered":"\n

\u672c\u6587\u76e1\u91cf\u7528\u7c21\u55ae\u7684\u65b9\u5f0f\uff0c\u8aaa\u660eJava\u7a0b\u5f0f\u8a9e\u8a00\u7684\u64b0\u5beb\u4ee5\u53ca\u61c9\u7528\u3002<\/p>\n\n\n\n

\u5efa\u8b70\u5728\u770b\u5b8c\uff0c\u4e26\u7406\u89e3\u4e4b\u5f8c\uff0c\u9084\u662f\u8981\u53bb\u89c0\u770b\u6559\u79d1\u66f8\u3001\u53c3\u8003\u66f8\uff0c\u624d\u80fd\u5b8c\u5168\u7406\u89e3\u3002<\/p>\n\n\n\n

Java\u8a9e\u8a00\u5728\u904b\u7b97\u5f0f\u7684\u90e8\u5206,\u548cC\u8a9e\u8a00<\/a>\u6975\u70ba\u985e\u4f3c, \u9664\u4e86\u6c92\u6709sizeof, pointer\u548cstruct\u76f8\u95dc\u7684\u904b\u7b97\u7b26\u865f\u5916, \u53e6\u5916\u65b0\u589e\u4e86>>>\u5411\u53f3\u7121\u865fshift, \u4ee5\u53ca\u7528\u4f86\u5224\u65b7\u7269\u4ef6\u578b\u614b\u7684instanceof\u3002Java\u7684\u5e38\u6578\u7684\u8868\u793a\u6cd5\u4e5f\u548cC\u76f8\u540c,\u800cJava\u88e1\u7684\u65b0\u8cc7\u6599\u578b\u614bboolean<\/a>\u7684\u5408\u6cd5\u503c\u70batrue\u548cfalse\u5169\u500b\u5e38\u6578\u3002<\/p>\n\n\n\n

\u7b97\u8853(Arithmetic)\u904b\u7b97\u7b26\u865f<\/h3>\n\n\n\n
\u904b\u7b97\u7b26\u865f<\/td>\u529f\u80fd\u6558\u8ff0<\/td><\/tr>
+<\/td>\u52a0<\/td><\/tr>
*<\/td>\u4e58<\/td><\/tr>
–<\/td>\u6e1b<\/td><\/tr>
\/<\/td>\u9664<\/td><\/tr>
%<\/td>\u9918\u6578<\/td><\/tr>
++<\/td>\u52a0\u4e00<\/td><\/tr>
—<\/td>\u6e1b\u4e00<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u908f\u8f2f(logic)\u904b\u7b97\u7b26\u865f<\/strong><\/h3>\n\n\n\n
\u904b\u7b97\u7b26\u865f<\/td>\u529f\u80fd\u6558\u8ff0<\/td><\/tr>
><\/td>\u5927\u65bc<\/td><\/tr>
<<\/td>\u5c0f\u65bc<\/td><\/tr>
>=<\/td>\u5927\u65bc\u7b49\u65bc<\/td><\/tr>
<=<\/td>\u5c0f\u65bc\u7b49\u65bc<\/td><\/tr>
==<\/td>\u7b49\u65bc<\/td><\/tr>
!=<\/td>\u4e0d\u7b49\u65bc<\/td><\/tr>
&&<\/td>logic AND<\/td><\/tr>
||<\/td>logic OR<\/td><\/tr>
!<\/td>logic NOT<\/td><\/tr>
instanceof<\/td>reference instanceof ClassName
\u5224\u65b7reference\u6240\u6307\u5230\u7684\u7269\u4ef6\u5176\u578b\u614b\u662f\u5426\u548cClassName\u76f8\u5bb9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Java\u8a9e\u8a00\u548cC\u8a9e\u8a00\u6709\u95dc\u908f\u8f2f\u904b\u7b97\u6700\u5927\u7684\u4e0d\u540c,\u5728\u65bcJava\u4ee5boolean<\/a>\u8cc7\u6599\u578b\u614b(\u53ea\u6709true\u548cfalse\u5169\u7a2e\u503c)\u5224\u65b7\u689d\u4ef6\u662f\u5426\u6210\u7acb,\u800cC\u8a9e\u8a00\u53ea\u80fd\u4f7f\u75280\u6216\u975e0\u3002<\/p>\n\n\n\n

\u4f4d\u5143(Bit)\u904b\u7b97\u7b26\u865f<\/strong><\/h3>\n\n\n\n
\u904b\u7b97\u7b26\u865f<\/td>\u529f\u80fd\u6558\u8ff0<\/td><\/tr>
&<\/td>bit AND<\/td><\/tr>
<<<\/td>left bit shift<\/td><\/tr>
|<\/td>bit OR<\/td><\/tr>
>><\/td>right bit shift with sign<\/td><\/tr>
^<\/td>bit XOR<\/td><\/tr>
~<\/td>1\u88dc\u6578<\/td><\/tr>
>>><\/td>\u540c>>\u4f46\u5de6\u908a\u4e00\u5f8b\u88dc\u96f6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u5176\u4ed6\u904b\u7b97\u7b26\u865f<\/strong><\/h3>\n\n\n\n
\u904b\u7b97\u5143<\/td>\u529f\u80fd\u6558\u8ff0<\/td><\/tr>
=<\/td>\u5c07\u53f3\u908a\u7684\u503c\u8907\u88fd\u5230\u5de6\u908a\u7684\u8b8a\u6578<\/td><\/tr>
(type)<\/td>\u5c07\u53f3\u908a\u7684\u6578\u503c\u6216reference\u8f49\u63db\u6210type\u578b\u5225<\/td><\/tr>
+=<\/td>\u5c07\u53f3\u908a\u7684\u6578\u503c\u52a0\u4e0a\u5de6\u908a\u7684\u6578\u503c\u7136\u5f8c\u6307\u5b9a\u7d66\u5de6\u908a\u7684\u8b8a\u6578<\/td><\/tr>
?:<\/td>\u82e5?\u5de6\u908a\u6210\u7acb\u5247\u505a:\u5de6\u908a\u5426\u5247\u505a:\u53f3\u908a<\/td><\/tr>
,<\/td>\u5408\u4f75\u5169\u500b\u904b\u7b97\u8996\u70ba\u4e00\u500b\u6558\u8ff0<\/td><\/tr>
(\u904b\u7b97\u5f0f)<\/td>\u8868\u793a()\u5167\u512a\u5148\u904b\u7b97<\/td><\/tr>
.<\/td>Reference.ObjectMember\u6216ClassName.ClassName
\u5b58\u53d6\u7269\u4ef6\u6216\u985e\u5225\u6210\u54e1<\/td><\/tr>
new<\/td>\u7522\u751f\u7269\u4ef6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u512a\u5148\u6b0a<\/strong><\/h3>\n\n\n\n
\u7a2e\u985e<\/td>\u904b\u7b97\u7b26\u865f<\/td>\u7d50\u5408\u9806\u5e8f<\/td><\/tr>
group<\/td>(op)<\/td>left to right<\/td><\/tr>
postfix<\/td>[] . (params) op++ op–<\/td>right to left<\/td><\/tr>
prefix<\/td>++op –op +op -op ~ !<\/td>right to left<\/td><\/tr>
creation or casting<\/td>new (type)op<\/td>right to left<\/td><\/tr>
multiplicative<\/td>* \/ %<\/td>left to right<\/td><\/tr>
additive<\/td>+ –<\/td>left to right<\/td><\/tr>
shift<\/td><< >> >>><\/td>left to right<\/td><\/tr>
relational<\/td>< > <= >= instanceof ==<\/td>left to right<\/td><\/tr>
equality<\/td>== !=<\/td>left to right<\/td><\/tr>
bitwise and<\/td>&<\/td>left to right<\/td><\/tr>
bitwise exclusive or<\/td>^<\/td>left to right<\/td><\/tr>
bitwise inclusive or<\/td>|<\/td>left to right<\/td><\/tr>
logical and<\/td>&&<\/td>left to right<\/td><\/tr>
logical or<\/td>||<\/td>left to right<\/td><\/tr>
conditional<\/td>? :<\/td>right to left<\/td><\/tr>
assignment<\/td>= += -= *= \/= %= &= ^= |= <<= >>= >>>=<\/td>right to left<\/td><\/tr>
seperator<\/td>,<\/td>left to right<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

java <\/strong>\u6559\u80b2 \u5b66\u751f \u88dc\u7fd2>>\u4e2d\u82f1\u6587\u8853\u8a9e\u5c0d\u7167<\/strong><\/h2>\n\n\n\n
\u4e2d\u82f1\u6587\u8853\u8a9e\u5c0d\u7167<\/th><\/tr><\/thead>
\u6587\u5b57\u7de8\u8f2f\u5668<\/td>text editor<\/td><\/tr>
\u6574\u5408\u958b\u767c\u74b0\u5883<\/td>Integrated Development Environment, IDE<\/td><\/tr>
\u95dc\u9375\u5b57<\/td>keyword<\/td><\/tr>
\u4fdd\u7559\u5b57<\/td>reserved word<\/td><\/tr>
\u4fee\u98fe\u5b50<\/td>modifier<\/td><\/tr>
\u5ba3\u544a<\/td>declare<\/td><\/tr>
\u5b57\u4e32<\/td>string<\/td><\/tr>
\u8a3b\u89e3<\/td>comment<\/td><\/tr>
\u8b58\u5225\u5b57<\/td>identifier<\/td><\/tr>
\u8b8a\u6578<\/td>variable<\/td><\/tr>
\u65b9\u6cd5<\/td>method<\/td><\/tr>
\u53c3\u6578<\/td>parameter<\/td><\/tr>
\u985e\u5225<\/td>class<\/a><\/td><\/tr>
\u5c6c\u6027<\/td>field<\/td><\/tr>
\u7269\u4ef6<\/td>object<\/td><\/tr>
\u7269\u4ef6\u5c0e\u5411\u7a0b\u5f0f\u8a9e\u8a00<\/td>object-oriented programming language<\/td><\/tr>
Java \u865b\u64ec\u6a5f\u5668<\/td>Java Virtual Machine, JVM<\/td><\/tr>
\u547c\u53eb<\/td>call<\/td><\/tr>
\u53c3\u8003<\/td>reference<\/td><\/tr>
\u5f37\u578b\u614b<\/td>strong typing<\/td><\/tr>
\u5ba3\u544a<\/td>declaration<\/td><\/tr>
\u8cc7\u6599\u578b\u614b<\/td>data type<\/td><\/tr>
\u5efa\u69cb\u5b50<\/td>constructor<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

java <\/strong>\u6559\u80b2 \u5b66\u751f \u88dc\u7fd2>>\u8cc7\u6599\u578b\u614b <\/strong><\/h2>\n\n\n\n

\u8b8a\u6578\u540d\u7a31\uff1a<\/strong><\/h3>\n\n\n\n

\u96d6\u7136\u8aaa\u53ef\u4ee5\u6309\u7167\u4f7f\u7528\u8005\u60f3\u8981\u7684\u540d\u7a31\u53bb\u5b9a\u7fa9\uff0c\u4f46\u662f\u6709\u5e7e\u500b\u9650\u5236\uff0c\u5efa\u8b70\u53c3\u8003\u66f8\u4e0a\u7684\u8aaa\u660e\uff0c\u6703\u6bd4\u8f03\u597d<\/p>\n\n\n\n

\u9019\u908a\u5efa\u8b70\u5404\u4f4d\u76e1\u91cf\u53d6\u6709\u610f\u7fa9\u7684\u540d\u7a31<\/p>\n\n\n\n

\u8cc7\u6599\u578b\u614b\uff1a<\/strong><\/h3>\n\n\n\n

\u9019\u4ee3\u8868\u9019\u500b\u8b8a\u6578\u7684\u985e\u578b<\/p>\n\n\n\n

\u7b2c5\u884c \u5c07 \u8b8a\u6578 text \u5ba3\u544a\u6210 String \u578b\u614b (\u5207\u8a18 String \u7684 S \u4e00\u5b9a\u8981\u5927\u5beb)<\/p>\n\n\n\n

\u9019\u4ee3\u8868 \u8b8a\u6578 text \u5b58\u653e\u7684\u662f \u5b57\u4e32 \uff0c \u800c\u4e14\u4ed6\u5c31\u53ea\u80fd\u5b58 \u5b57\u4e32 \uff0c\u4e0d\u80fd\u5b58\u5176\u4ed6\u6771\u897f<\/p>\n\n\n\n

\u7b2c6\u884c ~ \u7b2c8\u884c \u5c07 length \u3001 weidth \u8207 Height \u5ba3\u544a\u6210 int \u578b\u614b<\/p>\n\n\n\n

\u9019\u4ee3\u8868 \u4ee5\u4e0a\u4e09\u500b\u8b8a\u6578\u70ba \u6574\u6578\u578b\u614b<\/p>\n\n\n\n

\u5176\u4ee3\u8868\u7684\u610f\u7fa9\u5c31\u662f\uff0c\u9019\u4e09\u500b\u8b8a\u6578\u53ea\u80fd\u5b58 \u6574\u6578 \u800c\u4e14\u4ed6\u7684\u5927\u5c0f\u4ecb\u65bc -2147483648 ~ 2147483647 \u4e4b\u9593<\/p>\n\n\n\n

\u7b2c9\u884c \u5c07 pi \u5ba3\u544a\u6210 double \u578b\u614b<\/p>\n\n\n\n

\u9019\u4ee3\u8868 pi \u9019\u500b\u8b8a\u6578 \u70ba \u96d9\u7cbe\u78ba\u6d6e\u9ede\u6578 \u578b\u614b (\u9019\u7ffb\u8b6f\u6211\u500b\u4eba\u89ba\u5f97\u5f88\u721b\uff0c\u53cd\u6b63\u4ed6\u5c31\u662f\u4ee3\u8868 \u53ef\u4ee5\u5b58\u5c0f\u6578\u9ede\u5f8c\u5f88\u591a\u4f4d\u7684\u610f\u601d)<\/p>\n\n\n\n

\u7b2c10\u884c \u5ba3\u544a hp \u70ba float \u578b\u614b<\/p>\n\n\n\n

\u9019\u4ee3\u8868 hp \u9019\u500b\u8b8a\u6578 \u662f \u55ae\u7cbe\u78ba\u6d6e\u9ede\u6578 \u578b\u614b (\u540c\u4e0a\uff0c\u4ed6\u662fdouble\u7684\u5f31\u5316\u7248)<\/p>\n\n\n\n

\u4ee5\u4e0b\u8aaa\u660e\u8cc7\u6599\u578b\u614b\u4ee3\u8868\u7684\u610f\u7fa9 (\u8cc7\u6599\u53d6\u81ea\u65bcwiki)\uff1a<\/p>\n\n\n\n

boolean<\/a> : \u5e03\u6797\u503c\uff0c\u50c5\u6709\u5169\u500b\u5e38\u6578\uff0ctrue \u548c false.<\/p>\n\n\n\n

byte :\u4f4d\u5143\u7d44\u578b\u5225\u503c\uff0c\u9577\u5ea6\u4e00\u500b\u4f4d\u5143\u7d44\uff0c\u53d6\u503c\u7bc4\u570d\u662f -128 \u81f3 127\u3002<\/p>\n\n\n\n

short\uff1a\u77ed\u6574\u6578\uff0c\u9577\u5ea6\u5169\u500b\u4f4d\u5143\u7d44\uff0c\u53d6\u503c\u7bc4\u570d\u662f -32768 \u81f3 32767\u3002<\/p>\n\n\n\n

int\uff1a\u6574\u6578\uff0c\u9577\u5ea632\u4f4d\u5143\uff08\u56db\u500b\u4f4d\u5143\u7d44\uff09\uff0c\u53d6\u503c\u7bc4\u570d\u662f -2147483648 \u81f3 2147483647<\/p>\n\n\n\n

long\uff1a\u9577\u6574\u6578\uff0c\u9577\u5ea6\u516b\u500b\u4f4d\u5143\u7d44\uff0c\u53d6\u503c\u7bc4\u570d\u662f -9223372036854775808 \u81f3 9223372036854775807<\/p>\n\n\n\n

float\uff1a\u55ae\u7cbe\u5ea6IEEE754\u6d6e\u9ede\u6578\uff0c\u9577\u5ea6\u56db\u500b\u4f4d\u5143\u7d44\u3002<\/p>\n\n\n\n

double\uff1a\u500d\u7cbe\u5ea6IEEE754\u6d6e\u9ede\u6578\uff0c\u9577\u5ea6\u516b\u500b\u4f4d\u5143\u7d44\u3002<\/p>\n\n\n\n

char\uff1a\u5b57\u5143\u578b\uff0c\u9577\u5ea616\u4f4d\u5143\uff0c\u652f\u63f4\u6240\u6709\u7684UCS-2\u548cASCII\u7de8\u78bc\u3002<\/p>\n\n\n\n

\u5230\u9019\u908a\uff0c\u6211\u5011\u5ba3\u544a\u4e86\u8b8a\u6578\uff0c\u544a\u8a34\u96fb\u8166 \u62bd\u5c5c\u7684\u540d\u7a31(\u8b8a\u6578\u540d\u7a31) \u4e5f \u544a\u8a34\u96fb\u8166 \u62bd\u5c5c\u5b58\u653e\u4ec0\u9ebc\u985e\u578b\u7684\u6771\u897f(\u8cc7\u6599\u578b\u614b)<\/p>\n\n\n\n

\"IT\u96fb\u8166\u88dc\u7fd2
\u7acb\u523b\u8a3b\u518a\u53ca\u5831\u540d\u96fb\u8166\u88dc\u7fd2\u8ab2\u7a0b\u5427!<\/figcaption><\/figure>\n\n\n\n

\u8fd4\u56de\u4e3b\u9801(IT Teacher IT Freelance)<\/a><\/p>\n\n\n\n

facebook \u67e5\u8a62:
24 hours enquiry facebook channel :
https:\/\/www.facebook.com\/itteacheritfreelance\/?ref=aymt_homepage_panel<\/a><\/p>\n\n\n\n

Java \u6559\u80b2 \u5b66\u751f \u88dc\u7fd2>>\u5176\u4ed6 \u6559\u80b2 \u6587\u7ae0<\/strong> <\/h2>\n\n\n\n
\n
\n
\n
java\u7c21\u4ecb<\/a><\/blockquote>