{"id":213,"date":"2021-01-18T17:49:15","date_gmt":"2021-01-18T09:49:15","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=213"},"modified":"2021-01-19T17:14:06","modified_gmt":"2021-01-19T09:14:06","slug":"java-%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-213.html","title":{"rendered":"java \u8fd0\u7b97\u7b26"},"content":{"rendered":"\n

\u8fd0\u7b97\u7b26\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u51e0\u79cd<\/p>\n\n\n\n

  1. \u7b97\u672f\u8fd0\u7b97\u7b26<\/li>
  2. \u5173\u7cfb\u8fd0\u7b97\u7b26<\/li>
  3. \u4f4d\u8fd0\u7b97\u7b26<\/li>
  4. \u903b\u8f91\u8fd0\u7b97\u7b26<\/li>
  5. \u8d4b\u503c\u8fd0\u7b97\u7b26<\/li>
  6. \u7c7b\u578b\u5224\u65ad\u8fd0\u7b97\u7b26<\/li><\/ol>\n\n\n\n

    1.\u7b97\u672f\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n

    \u7b97\u672f\u8fd0\u7b97\u7b26\uff0c\u662f\u8fdb\u884c\u6570\u5b66\u8ba1\u7b97\u7684\u7b26\u53f7<\/p>\n\n\n\n

    \u7b26\u53f7<\/th>\u63cf\u8ff0<\/th><\/tr>
    +<\/td>\u52a0\u6cd5 <\/td><\/tr>
    –<\/td>\u51cf\u6cd5<\/td><\/tr>
    *<\/td>\u4e58\u6cd5 <\/td><\/tr>
    \/<\/td>\u9664\u6cd5 <\/td><\/tr>
    \uff05<\/td>\u53d6\u4f59 – \u53d6\u5f97\u4f59\u6570<\/td><\/tr>
    ++<\/td>\u81ea\u589e: \u53d8\u91cf\u7684\u503c\u52a01<\/td><\/tr>
    —<\/td>\u81ea\u51cf: \u53d8\u91cf\u7684\u503c\u51cf1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    1.\u52a0\u53f7( + )\u7684\u7279\u6b8a\u7528\u6cd5<\/h5>\n\n\n\n

    \u4e0d\u5355\u53ef\u4ee5\u8fdb\u884c\u6570\u5b66\u8fd0\u7b97\uff0c\u8fd8\u53ef\u4ee5\u7528\u4e8e\u5b57\u7b26\u4e32\u7684\u8fde\u63a5\uff0c\u6bd4\u5982<\/p>\n\n\n\n

    String s = \"hello\"+\"world\"; \/\/ s \u7684\u503c\u662f helloworld<\/code><\/pre>\n\n\n\n
    2.\u8fd0\u7b97\u65f6\u53d1\u751f\u81ea\u52a8\u8f6c\u6362<\/h5>\n\n\n\n
    \u5728\u8fdb\u884c\u8fd0\u7b97\u65f6\uff0c\u4f1a\u81ea\u52a8\u5c06\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a 2 \u8005\u4e2d\u7cbe\u5ea6\u6700\u9ad8\u7684\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
    int a = (int)5.3 * 3; \/\/ \u8ba1\u7b97\u65f6\uff0c\u4f1a\u81ea\u52a8\u8f6c\u6362\u4e3a double, \u60f3\u8981 int \u5fc5\u987b\u5f3a\u5236\u8f6c\u6362<\/code><\/pre>\n\n\n\n
    3.\u9664\u6cd5\u7684\u89c4\u5219<\/h5>\n\n\n\n
    \u9664\u6cd5\uff0c\u5f97\u5230\u7684\u662f\u6574\u6570\uff0c\u82e5\u60f3\u8981\u4f59\u6570\uff0c\u9700\u8981\u4f7f\u7528\u53d6\u4f59\u8fd0\u7b97( % )<\/p>\n\n\n\n
    int s = 5\/2; \/\/\u5f97\u5230\u7684\u7ed3\u679c\u662f 2\uff0c\u662f\u4e00\u4e2a int \u7c7b\u578b\u7684\u6570<\/code><\/pre>\n\n\n\n
    4.\u81ea\u589e\u81ea\u51cf\u7684\u5148\u540e<\/h5>\n\n\n\n
    int a = 10,b=10; \/\/ \u5b9a\u4e49 2 \u4e2a\u53d8\u91cf\uff0ca,b\u5747\u7b49\u4e8e10\nint a1 = 5*++a;   \/\/ a1 \u662f\u5148 ++\uff0c\u5219\u7b49\u4e8e11\uff0c\u518d * 5\u7b49\u4e8e 55\nint b1= 5*b++;  \/\/ b1\u662f\u5148\u4f7f\u7528 5*10, \u5219\u7b49\u4e8e50<\/code><\/pre>\n\n\n\n
    2.\u5173\u7cfb\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    \u5173\u7cfb\u8fd0\u7b97\u7b26\uff0c\u8fd0\u7b97\u7684\u7ed3\u679c\u662f\u4e00\u4e2a\u5e03\u5c14\u503c\uff0c true,  false <\/p>\n\n\n\n
    \u7b26\u53f7<\/th>\u63cf\u8ff0<\/th><\/tr>
    ==<\/td>\u6052\u7b49\u4e8e( \u7b49\u4e8e )<\/td><\/tr>
    !=<\/td>\u4e0d\u7b49\u4e8e<\/td><\/tr>
    > <\/td>\u5927\u4e8e<\/td><\/tr>
    < <\/td>\u5c0f\u4e8e<\/td><\/tr>
    >=<\/td>\u5927\u4e8e\u7b49\u4e8e<\/td><\/tr>
    <=<\/td>\u5c0f\u4e8e\u7b49\u4e8e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    3.\u4f4d\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    \u4f4d\u8fd0\u7b97\u7b26\uff0c\u662f\u53d6\u6570\u636e\u7684 “\u4e8c\u8fdb\u5236\u4f4d” \u8fdb\u884c\u64cd\u4f5c\u7684\uff0c\u7528\u5230\u7684\u8f83\u5c11<\/p>\n\n\n\n
    \u7b26\u53f7<\/th>\u63cf\u8ff0<\/th><\/tr>
    \uff06<\/td>\u5982\u679c\u76f8\u5bf9\u5e94\u4f4d\u90fd\u662f1\uff0c\u5219\u7ed3\u679c\u4e3a1\uff0c\u5426\u5219\u4e3a0<\/td><\/tr>
    |<\/td>\u5982\u679c\u76f8\u5bf9\u5e94\u4f4d\u90fd\u662f 0\uff0c\u5219\u7ed3\u679c\u4e3a 0\uff0c\u5426\u5219\u4e3a 1<\/td><\/tr>
    ^<\/td>\u5982\u679c\u76f8\u5bf9\u5e94\u4f4d\u503c\u76f8\u540c\uff0c\u5219\u7ed3\u679c\u4e3a0\uff0c\u5426\u5219\u4e3a1<\/td><\/tr>
    \u301c<\/td>\u6309\u4f4d\u53d6\u53cd\u8fd0\u7b97\u7b26\u7ffb\u8f6c\u64cd\u4f5c\u6570\u7684\u6bcf\u4e00\u4f4d\uff0c\u53730\u53d8\u62101\uff0c1\u53d8\u62100\u3002<\/td><\/tr>
    << <\/td>\u6309\u4f4d\u5de6\u79fb\u8fd0\u7b97\u7b26\u3002\u5de6\u64cd\u4f5c\u6570\u6309\u4f4d\u5de6\u79fb\u53f3\u64cd\u4f5c\u6570\u6307\u5b9a\u7684\u4f4d\u6570\u3002<\/td><\/tr>
    >> <\/td>\u6309\u4f4d\u53f3\u79fb\u8fd0\u7b97\u7b26\u3002\u5de6\u64cd\u4f5c\u6570\u6309\u4f4d\u53f3\u79fb\u53f3\u64cd\u4f5c\u6570\u6307\u5b9a\u7684\u4f4d\u6570\u3002<\/td><\/tr>
    >>> <\/td>\u6309\u4f4d\u53f3\u79fb\u8865\u96f6\u64cd\u4f5c\u7b26\u3002\u5de6\u64cd\u4f5c\u6570\u7684\u503c\u6309\u53f3\u64cd\u4f5c\u6570\u6307\u5b9a\u7684\u4f4d\u6570\u53f3\u79fb\uff0c\u79fb\u52a8\u5f97\u5230\u7684\u7a7a\u4f4d\u4ee5\u96f6\u586b\u5145\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    3.\u903b\u8f91\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    \u7b26\u53f7<\/th>\u63cf\u8ff0<\/th><\/tr>
    &&<\/td>\u4e0e\u8fd0\u7b97\u7b26\uff0c2\u8005\u5747\u4e3a\u771f\uff0c\u7ed3\u679c\u624d\u4e3a\u771f<\/td><\/tr>
    | |<\/td>\u6216\u8fd0\u7b97\u7b26\uff0c2\u8005\u4e2d\u7684\u4efb\u4e00\u4e2a\u4e3a\u771f\u5373\u4e3a\u771f<\/td><\/tr>
    \uff01<\/td>\u53d6\u975e\u8fd0\u7b97\u7b26<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \u903b\u8f91\u4e0e\uff0c\u903b\u8f91\u6216\u8fd0\u7b97\uff0c\u4f1a\u51fa\u73b0 “\u77ed\u8def” \u60c5\u51b5<\/h5>\n\n\n\n
    1.\u5982\u679c\u5df2\u77e5\u524d\u4e00\u4e2a\u6761\u4ef6\u4e3a\u5047\uff0c\u5219\u4e0e\u8fd0\u7b97\u540e\u4e00\u4e2a\u6761\u4ef6\u4e0d\u8ba1\u7b97<\/p>\n\n\n\n
    2.\u5982\u679c\u5df2\u77e5\u524d\u4e00\u4e2a\u6761\u4ef6\u4e3a\u771f\uff0c\u5219\u6216\u8fd0\u7b97\u540e\u4e00\u4e2a\u6761\u4ef6\u4e0d\u8ba1\u7b97<\/p>\n\n\n\n
    4.\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    \u7b26\u53f7<\/th>\u63cf\u8ff0<\/th><\/tr>
    =<\/td>\u53f3\u4fa7\u8d4b\u503c\u7ed9\u5de6\u4fa7<\/td><\/tr>
    + =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7+\u53f3\u4fa7<\/td><\/tr>
    – =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7-\u53f3\u4fa7<\/td><\/tr>
    * =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7*\u53f3\u4fa7<\/td><\/tr>
    \/ =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7\/\u53f3\u4fa7<\/td><\/tr>
    %=<\/td>\u5de6\u4fa7 = \u5de6\u4fa7%\u53f3\u4fa7<\/td><\/tr>
    << =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7<<\u53f3\u4fa7<\/td><\/tr>
    >> =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7>>\u53f3\u4fa7<\/td><\/tr>
    \uff06=<\/td>\u5de6\u4fa7 = \u5de6\u4fa7&\u53f3\u4fa7<\/td><\/tr>
    ^ =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7^\u53f3\u4fa7<\/td><\/tr>
    | =<\/td>\u5de6\u4fa7 = \u5de6\u4fa7|\u53f3\u4fa7<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    5.\u4e09\u5143\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    \u6709\u4e09\u4e2a\u64cd\u4f5c\u6570\uff0c\u53ef\u7528\u4e8e\u66ff\u4ee3\u7b80\u5355\u7684 if \u8bed\u53e5<\/p>\n\n\n\n
    \u6570\u503c\u7c7b\u578b \u53d8\u91cf\u540d = \u8868\u8fbe\u5f0f ? \u771f : \u5047<\/code><\/pre>\n\n\n\n
    \u4f8b\u5982\uff0c\u8ba9 c \u53d6 a, b \u4e2d\u7684\u6700\u5927\u503c<\/p>\n\n\n\n
    int a=1,b=2; \/\/\u5b9a\u4e49 a=1, b=2\nint c=a>b?a:b;\/\/ \u5982\u679ca>b\u6210\u7acb\uff0c\u5219c=a\uff0c\u5426\u5219c=b<\/code><\/pre>\n\n\n\n
    6.\u7c7b\u578b\u5224\u65ad\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    instanceof \u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u8fd0\u7b97\u7b26\uff0c\u53ef\u4ee5\u5224\u65ad\u67d0\u4e2a\u503c\u662f\u5426\u5c5e\u4e8e\u67d0\u4e2a\u7c7b\u578b<\/p>\n\n\n\n
    \u4f8b\u5b50\uff1a<\/p>\n\n\n\n
    Integer name = 1;\/\/\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u4e3a interger \u7c7b\u578b\uff0c\u503c\u4e3a 1\nboolean result = name instanceof Integer; \/\/ result==>true<\/code><\/pre>\n\n\n\n
    \u8be5\u8fd0\u7b97\u7b26\uff0c\u53ea\u80fd\u7528\u4e8e\u5c01\u88c5\u7c7b\u578b<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u8fd0\u7b97\u7b26\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u51e0\u79cd \u7b97\u672f\u8fd0\u7b97\u7b26 \u5173\u7cfb\u8fd0\u7b97\u7b26 \u4f4d\u8fd0\u7b97\u7b26 \u903b\u8f91\u8fd0\u7b97\u7b26 \u8d4b\u503c\u8fd0\u7b97\u7b26 \u7c7b\u578b\u5224\u65ad\u8fd0\u7b97\u7b26 1.\u7b97\u672f\u8fd0\u7b97… \u7ee7\u7eed\u9605\u8bfb java \u8fd0\u7b97\u7b26<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/213"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=213"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/213\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}