请问在进行赋值时,short, int哪个更快?
java\u8d4b\u503c\u95ee\u9898int long short\u4f60\u6709java 2 \u53c2\u8003\u5927\u5168 \u8fd9\u672c\u4e66\u5417\uff1f\uff1f
\u90a3\u4e0a\u9762\u6709\u5173\u4e8e\u8fd9\u4e2a\u7684\u89e3\u91ca
\u6211\u770b\u8fc7\u8bb0\u4e0d\u5927\u6e05\u695a\u4e86
\u8bf4\u4e00\u70b9\u6211\u81ea\u5df1\u7684\u770b\u6cd5 \u53ef\u80fd\u4e0d\u592a\u5bf9
\u6211\u8ba4\u4e3a\u4f60\u7b2c\u4e00\u4e2a\u8bed\u53e5\u662f\u5c11\u52a0\u4e86L\uff0c\u624d\u62a5\u7684\u9519\uff0c\u8fd9\u662f\u8bed\u6cd5\u7684\u95ee\u9898\u5427\uff0c\u4e0d\u52a0\u540e\u7f00\uff0c\u7cfb\u7edf\u4f1a\u8ba4\u4e3a\u4f60\u8981\u53bb\u8d4b\u503c\u7ed9\u4e00\u4e2aint\u578b\u53d8\u91cf\uff0c\u5c31\u4f1a\u62a5\u9519
\u7b2c\u4e09\u4e2a\u8bed\u53e5\u4e0d\u62a5\u9519\uff0c\u90a3\u662f\u56e0\u4e3a\uff0cshort\u578b\u7684\u53d8\u91cf\u53d6\u503c\u8303\u56f4\u57280\u2014\u2014255\u4e4b\u5185\uff0c\u8fd9\u4e2a\u8303\u56f4\u91cc\u9762\u7684\u6570\u53ef\u4ee5\u76f4\u63a5\u8d4b\u503c\u7ed9short\u3002\u4f60\u53ef\u4ee5\u8bd5\u8bd5\u628a266\u8d4b\u503c\u7ed9short\u53d8\u91cf\uff0c\u6216\u8005\u4f60\u53ef\u4ee5\u8bd5\u8bd5\u8fd9\u6837 int a =5,short b = a ,\u8fd9\u6837\u4e5f\u901a\u4e0d\u8fc7\uff0c\u9700\u8981\u5f3a\u5236\u8f6c\u6362\uff0c
short b =(int)a,\u8fd9\u65f6\u6ca1\u95ee\u9898\uff0c\u56e0\u4e3a5\u4e0d\u8d85\u8fc70--255\u8fd9\u4e2a\u8303\u56f4\u3002\u4f46\u662f\u4f60\u8bd5\u8bd5\u8fd9\u6837
int a =265,short b = \uff08int\uff09a\uff0c\u4e5f\u4e0d\u62a5\u9519\uff0c\u4f46\u662f\u4f60\u6253\u5370\u51fa\u6765b\uff0c\u5c31\u4f1a\u53d1\u73b0\u635f\u5931\u7cbe\u5ea6\u4e86
java\u662f\u8fd9\u6837\uff0c\u5f53\u4f60\u58f0\u660e\u4e00\u4e2a\u53d8\u91cf\u540e\uff0c\u7cfb\u7edf\u5c31\u5728\u6808\u91cc\u5b58\u50a8\u4e86\u8fd9\u4e2a\u53d8\u91cf\uff0c\u53d8\u91cf\u7684\u5b9e\u9645\u5b58\u50a8\u7a7a\u95f4\u5728\u5806\u6808\u91cc\uff0c\u53ea\u6709\u4f60\u7ed9\u8fd9\u4e2a\u53d8\u91cf\u8d4b\u503c\uff08\u5b9e\u4f8b\u5316\uff09\u65f6\uff0c\u7cfb\u7edf\u624d\u4f1a\u5728\u5806\u6808\u91ccnew\u51fa\u4e00\u5757\u7a7a\u95f4\uff0c\u7136\u540e\u628a\u4f60\u8981\u8d4b\u503c\u7684\u6570\u503c\u8f6c\u5316\u6210\u4e8c\u8fdb\u5236\uff0c\u8fd9\u65f6\uff0c\u5982\u679c\u4f60\u8d4b\u503c\u7684\u6570\u503c\u8d85\u8fc7\u8fd9\u4e2a\u7c7b\u578b\u7684\u53d8\u91cf\u7684\u6570\u503c\u8303\u56f4\uff0c\u5c31\u4f1a\u653e\u4e0d\u4e0b\uff0c\u6240\u4ee5\u7f16\u8bd1\u5c31\u4f1a\u62a5\u9519\u3002
\u6570\u503c\u662f\u6ca1\u6709\u7c7b\u578b\u7684\uff0c\u53ea\u6709\u53d8\u91cf\u624d\u6709\u7c7b\u578b
\u4e0d\u540c\u957f\u5ea6\u7684\u6574\u5f62\u6570\u76f8\u4e92\u8d4b\u503c\u65f6\uff0c\u662f\u5426\u80fd\u901a\u8fc7\u7f16\u8bd1\uff0c\u662f\u6839\u636e\u7f16\u8bd1\u5668\u8bbe\u5b9a\u7684\u5bf9\u7c7b\u578b\u4e00\u81f4\u6027\u8981\u6c42\u7684\u7a0b\u5ea6\u5f00\u5173\u6765\u51b3\u5b9a\u7684\uff0c\u7f3a\u7701\u60c5\u51b5\u4f1a\u6709\u8b66\u544a\u63d0\u793a\uff0c\u4f46\u80fd\u901a\u8fc7\u7f16\u8bd1\uff0c\u4f46\u8fd9\u79cd\u8b66\u544a\u53ef\u4ee5\u88ab\u5173\u95ed\uff0c\u6216\u5728\u4f7f\u7528\u5e38\u91cf\u65f6\u7f16\u8bd1\u5668\u8ba4\u4e3a\u4e0d\u4f1a\u51fa\u73b0\u610f\u5916\u95ee\u9898\u3002\u53e6\u4e00\u4e2a\u60c5\u51b5\u662fint \u548c short\u7684\u957f\u5ea6\u6709\u65f6\u5bf9\u4e0d\u540c\u7684\u5e73\u53f0\u6709\u4e0d\u540c\u7684\u5b9a\u4e49\uff0c\u5982int \u53ef\u4ee5\u662f64bit\u4e5f\u53ef\u4ee5\u662f32bit,short \u53ef\u4ee5\u662f32bit \u621616bit\u7b49\uff0c\u5f53int\u548cshort\u540c\u957f\u5ea6\u65f6\uff0c\u5f53\u7136\u4e5f\u6ca1\u95ee\u9898\u5566
反汇编代码如下，我给你分析pushl %ebp
movl %esp, %ebp
subl $12, %esp
:前3行不用看，是分配栈的
movw -2(%ebp), %ax
andl $-8, %eax
orl $2, %eax
movw %ax, -2(%ebp)
:这四行为n.a=10
movl $10, -8(%ebp)
:为int x=10;
movw $10, -10(%ebp)
:为short y=10;
movl 和movw指令是长字和字的移动指令，估计是movw快一些吧
这个原理上应该shot最快，要写的内存位数少嘛，但相差多少时间很难计算
不同长度的整形数相互赋值时，是否能通过编译，是根据编译器设定的对类型一致另一个情况是int 和 short的长度有时对不同的平台有不同的定义，如int
绛旓細鍥犱负瓒呰繃浜32768杩欎釜鏈澶鐨剆hort 姝ｆ暟锛屽洜姝や細杈撳嚭璐熸暟 47560 as short:-17976
绛旓細int鍜宻hort鎵鑳借〃绀鐨鑼冨洿涓嶄竴鏍凤紝int鍊艰秴鍑簊hort鎵琛ㄧず鐨勮寖鍥达紝鏁呭皢int璧嬪缁short鏃蹇呮孩鍑猴紝鍙己鍒惰浆鎹絾寰楀埌鍊兼槸閿欒鐨勫硷紝鑳藉杩愯閫氳繃 int b = 32769锛泂hort a = 锛坰hort锛塨锛
绛旓細short 鏈澶у兼槸0111 1111 1111 1111锛屽嵆2鐨15娆℃柟鍑1锛堟渶楂樹綅鏄鍙蜂綅锛塽nsigned short 鏈澶у兼槸1111 1111 1111 1111锛屽嵆2鐨16娆℃柟鍑1 褰撶粰16浣嶇殑unsigned short 瀵硅薄璧嬪100000鏃,璧嬬殑鍊兼槸浠涔堬紝閭ｅ氨鏄畠鑷繁浜
绛旓細鏄鐨勶紝浣嗘槸寰楀己鍒剁被鍨嬭浆鎹 float a= (float) 2.8;short b=(short) a;閭ｄ箞b=2;
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绛旓細鏂囧瓧閮ㄥ垎锛歶nsigned short鐨勮寖鍥存槸0~65535锛宻hort鐨鑼冨洿鏄-32768~+32878銆傛妸鍓嶈呯殑鍊艰祴缁欏悗鑰咃紝鑻ュ叾鍊煎湪0~32767涔嬮棿鍒欒緭鍑虹浉鍚岋紝鑻ュ叾鍊煎湪32768~65535涔嬮棿鍒欒緭鍑哄搴旂殑璐熸暟銆璧嬪兼椂鑲畾瑕佸己鍒讹紝鍚﹀垯鍑洪敊銆傚浘鐗囬儴鍒嗭細D)30姝ｇ‘锛岄塂)銆
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绛旓細璁颁綇锛宻hort绫诲瀷闀垮害姣攊nt绫绘х煭锛屽綋short + int 鏃跺欓粯璁ょ粨鏋滄槸绫诲瀷杈冮暱鐨涓鏂逛篃灏辨槸int 鎵浠 i + 1 鍊兼槸int绫诲瀷锛屼笉鑳璧嬪缁檚hort绫诲瀷锛屼篃灏辨槸璇撮暱鐨勭被鍨嬩笉鑳借祴鍊肩粰鐭殑绫诲瀷锛岄櫎闈炲己鍒惰浆鍨嬶紙浣嗚繖鏍蜂細浜х敓绮惧害闂锛変互涓嬮棶棰橈紝閮芥槸涓婇潰鐭ヨ瘑鐐圭殑琛嶇敓鐗┿傝繕鏈夛紝鎻愮ず浣狅細short i = 0;i += 1 ...
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