{"id":16,"date":"2017-04-19T17:27:42","date_gmt":"2017-04-19T09:27:42","guid":{"rendered":"http:\/\/www.myway5.com\/?p=16"},"modified":"2017-04-19T18:14:46","modified_gmt":"2017-04-19T10:14:46","slug":"object-memory-difference-between-java-and-c-plus-plus","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2017\/04\/19\/object-memory-difference-between-java-and-c-plus-plus\/","title":{"rendered":"c++\u548cJava\u7684\u5bf9\u8c61\u5185\u5b58\u5f02\u540c"},"content":{"rendered":"

##\u524d\u8a00<\/p>\n

\u597d\u4e45\u90fd\u6ca1\u6709\u5199\u535a\u5ba2\u4e86\u3002\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u7684\u5b9e\u4e60\uff0c\u6536\u83b7\u4e0a\u611f\u89c9\u5e76\u4e0d\u662f\u5f88\u5927\uff0c\u8fd8\u597d\u81ea\u5df1\u4e5f\u6709\u770b\u4e00\u4e9b\u4e1c\u897f\u3002\u56e0\u4e3a\u6bd5\u4e1a\u8bbe\u8ba1\u505a\u7684\u662fc++\u65b9\u9762\u7684\u7f16\u7a0b\uff0c\u7b97\u662f\u521d\u63a2c++\u7684\u5185\u5bb9\u3002\u8fd9\u91cc\u7b80\u5355\u8bb0\u5f55\u81ea\u5df1\u5bf9c++\u548cjava\u7684\u5bf9\u8c61\u5185\u5b58\u533a\u522b\uff0c\u8c08\u8c08c++\u4e3a\u4ec0\u4e48\u6027\u80fd\u8981\u6bd4java\u9ad8\u3002\u60f3\u5230\u54ea\u91cc\u5c31\u8bb0\u5230\u54ea\u91cc\uff0c\u56e0\u4e3a\u5f88\u591a\u4e1c\u897f\u81ea\u5df1\u4e5f\u8981\u67e5\u8bc1\u624d\u80fd\u786e\u5b9a\u3002<\/p>\n

##1.\u6808\u548c\u5806<\/p>\n

\u6808\u548c\u5806\u5728\u6570\u636e\u7ed3\u6784\u4e0a\u662f\u4e24\u79cd\u4e0d\u540c\u7684\u7ed3\u6784\uff0c\u6808\u7684\u7279\u70b9\u662f\u5148\u8fdb\u540e\u51fa\uff0c\u800c\u5806\u5219\u53ef\u4ee5\u770b\u505a\u662f\u4e00\u5927\u5806\u6570\u636e\u7684\u96c6\u5408\u3002\u5728c++\u548cJava\u7684\u5185\u5b58\u4e2d\uff0c\u4e5f\u6709\u5806\u548c\u6808\u7684\u6982\u5ff5\u3002
\n\u9996\u5148\u7406\u89e3\u4e00\u4e0b\uff0c\u5185\u5b58\u4e2d\u6808\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u88ab\u79f0\u4e3a\u6808\u5e27\uff0c\u6bcf\u4e2a\u6808\u5e27\u4e2d\u5b58\u50a8\u4e00\u4e2a\u65b9\u6cd5(function)\u4e2d\u7684\u7528\u5230\u7684\u53d8\u91cf\u5185\u5b58\u3002\u7a0b\u5e8f\u6267\u884c\u65f6\uff0c\u5c31\u662f\u4e00\u4e2a\u6808\u4e2d\u7684\u6bcf\u4e00\u5e27\u88ab\u8bfb\u53d6\u6267\u884c\u7684\u8fc7\u7a0b\u3002\u5806\u5219\u662f\u4e3b\u8981\u7528\u6765\u5b58\u50a8\u5bf9\u8c61\u3002\u90a3\u4e48\u5728c++\u548cjava\u4e2d\u5230\u5e95\u6709\u4ec0\u4e48\u4e0d\u540c\u5462?<\/p>\n

“`c++
\nobject* processObject(int param){
\n object obj;
\n obj.param = param;
\n return &obj;
\n}<\/p>\n

int main(){
\n object* obj = processObject(10);
\n obj->do_something(); \/\/1
\n}<\/p>\n

<pre><code><br \/>1\u5904\u662f\u4f1a\u51fa\u73b0\u4e00\u4e2a\u7a7a\u6307\u9488\u9519\u8bef\u7684\u3002\u800c\u5982\u679c\u8fd9\u662f\u4e00\u6bb5java\u7684\u4ee3\u7801\u5219\u5b8c\u5168\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n

\u5728c++\u548cjava\u4e2d\uff0c\u4e00\u4e2a\u6808\u5e27\u88ab\u6267\u884c\u5b8c\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u5c31\u76f4\u63a5\u88ab\u91ca\u653e\u4e86\u3002\u800c\u5728c++\u4e2d\uff0c\u6240\u6709\u901a\u8fc7\u58f0\u660e\u4ea7\u751f\u7684\u5bf9\u8c61\u90fd\u662f\u5728\u6808\u4e0a\u5f00\u8f9f\u5185\u5b58\u7a7a\u95f4\uff0c\u6240\u4ee5\u51fd\u6570\u6267\u884c\u5b8c\u540e\u8fd9\u4e2a\u5bf9\u8c61\u4e5f\u5c31\u88ab\u91ca\u653e\u4e86\uff0c\u90a3\u4e48\u8fd4\u56de\u51fa\u6765\u5c31\u662f\u4e00\u4e2a\u7a7a\u6307\u9488\u4e86\u3002\u53ea\u6709\u901a\u8fc7new\u751f\u6210\u7684\u5bf9\u8c61\u624d\u4f1a\u5728\u5806\u4e2d\u7533\u8bf7\u7a7a\u95f4\uff0c\u56e0\u6b64\u901a\u8fc7new\u51fa\u6765\u7684\u5bf9\u8c61\u90fd\u9700\u8981\u5728\u4e0d\u7528\u65f6\u624b\u52a8\u91ca\u653e\u5185\u5b58\uff0c\u4e0d\u7136\u5c31\u4f1a\u5185\u5b58\u6cc4\u9732\u3002\u800c\u5728java\u4e2d\uff0c\u5bf9\u8c61\u662f\u5728\u5806\u4e2d\u751f\u6210\u7684(JDK7\u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u5728\u5e38\u91cf\u6c60\u4e2d\uff0cint\u7b49\u5b57\u9762\u503c\u5728\u9650\u5b9a\u8303\u56f4\u5185\u4e5f\u4f1a\u5728\u5e38\u91cf\u6c60\u4e2d\u7533\u8bf7\u5185\u5b58),\u6240\u6709\u65b9\u6cd5\u5185\u7684\u5bf9\u8c61\u90fd\u662f\u4e00\u4e2a\u6307\u5411\u5806\u4e2d\u76f8\u5e94\u5bf9\u8c61\u7684\u6307\u9488\uff08\u6ce8\u610f\u662f\u6307\u9488\u800c\u4e0d\u662f\u5f15\u7528\uff0c\u5f88\u591a\u4eba\u8ba4\u4e3ajava\u4e2d\u5411\u65b9\u6cd5\u4f20\u9012\u53c2\u6570\u662f\u5f15\u7528\u4f20\u9012\uff0c\u4f46\u5176\u5b9e\u662f\u503c\u4f20\u9012\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u4e2a\u503c\u662f\u6307\u5411\u5bf9\u8c61\u7684\u6307\u9488\uff09\u3002\u800c\u5728java\u4e2d\u4e0d\u9700\u8981\u624b\u52a8\u91ca\u653e\u5185\u5b58\u5219\u662f\u56e0\u4e3aJava\u62e5\u6709GC\u673a\u5236(Garbage collect,\u5783\u573e\u56de\u6536)\u3002\u8fd9\u4e2a\u5728\u4e4b\u540e\u518d\u8c08\u3002<\/p>\n

##2 java\u7684\u5f3a\u5f31\u5f15\u7528\u548cc++\u7684\u667a\u80fd\u6307\u9488<\/p>\n

java\u7684\u5f3a\u5f31\u5f15\u7528\u548cc++\u7684\u667a\u80fd\u6307\u9488\u90fd\u662f\u5728\u5e0c\u671b\u53ef\u4ee5\u66f4\u597d\u7684\u8fdb\u884c\u5185\u5b58\u7ba1\u7406\u7684\u524d\u63d0\u4e0b\u51fa\u73b0\u7684\uff0cjava\u7684\u5f3a\u5f31\u5f15\u7528\u53ef\u4ee5\u5e2e\u52a9GC\u673a\u5236\u8fdb\u884c\u7c92\u5ea6\u66f4\u7ec6\u7684\u5185\u5b58\u56de\u6536\uff0c\u800cc++\u7684\u667a\u80fd\u6307\u9488\u5219\u662f\u8ba9\u6ca1\u6709GC\u673a\u5236\u7684c++\u6709\u4e86\u4e00\u5b9a\u80fd\u529b\u7684\u81ea\u52a8\u91ca\u653e\u5185\u5b58\u7684\u80fd\u529b\u3002
\n###a. java\u7684\u5f3a\u5f31\u5f15\u7528
\njava\u7684\u5f15\u7528\u5171\u6709\u56db\u79cd,\u5206\u522b\u4e3a\u5f3a\u5f15\u7528\uff08Strong Reference\uff09\u3001\u8f6f\u5f15\u7528\uff08Soft Reference\uff09\u3001\u5f31\u5f15\u7528\uff08Weak Reference\uff09\u3001\u865a\u5f15\u7528\uff08Phantom Reference\uff09\u3002
\n\u4e4b\u6240\u4ee5\u5b9a\u4e49\u51fa\u8fd9\u4e48\u591a\u5f15\u7528\uff0c\u662f\u5e0c\u671b\u5728GC\u53d1\u751f\u65f6\uff0c\u53ef\u4ee5\u66f4\u7075\u6d3b\u7684\u8fdb\u884c\u5bf9\u8c61\u7684\u9500\u6bc1\u3002<\/p>\n

\u5f3a\u5f15\u7528\u5c31\u662f\u901a\u8fc7new\u51fa\u6765\u7684\u5bf9\u8c61\uff0c\u5f3a\u5f15\u7528\u8868\u793a\u7684\u90fd\u662f\u5fc5\u9700\u7684\u5bf9\u8c61\uff0c\u8fd9\u662f\u65e0\u8bba\u5982\u4f55\u90fd\u4e0d\u4f1a\u88ab\u56de\u6536\u7684\u3002<\/p>\n

\u800c\u8f6f\u5f15\u7528\u5219\u8868\u793a\u6709\u7528\u4f46\u975e\u5fc5\u9700\u7684\u5bf9\u8c61\u3002\u5f53\u7cfb\u7edf\u5185\u5b58\u4e0d\u591f\u5c06\u8981\u53d1\u751f\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38\u7684\u65f6\u5019\uff0c\u4f1a\u5c06\u8f6f\u5f15\u7528\u7684\u5bf9\u8c61\u5217\u5165\u56de\u6536\u8303\u56f4\uff0c\u8fdb\u884c\u4e8c\u6b21\u56de\u6536\u3002\u53ea\u6709\u8fd9\u6b21\u56de\u6536\u4ecd\u7136\u5185\u5b58\u4e0d\u8db3\u624d\u4f1a\u629b\u51fa\u5185\u5b58\u6ea2\u51fa\u5f02\u5e38\u3002JDK1.2\u4e4b\u540e\u63d0\u4f9b\u4e86SoftReference\u7c7b\u6765\u5b9e\u73b0\u8fd9\u4e2a\u3002<\/p>\n

\u5f31\u5f15\u7528\u4e5f\u7528\u6765\u8868\u793a\u975e\u5fc5\u9700\u7684\u5bf9\u8c61\uff0c\u4e0d\u540c\u7684\u662f\uff0c\u8fd9\u4e2a\u5f15\u7528\u5e76\u4e0d\u80fd\u5e2e\u52a9\u5bf9\u8c61\u8eb2\u8fc7\u4efb\u4f55\u7684GC\uff0c\u4e5f\u5c31\u662f\u8bf4\u65e0\u8bba\u5982\u4f55\uff0c\u53d1\u751fGC\u65f6\u8fd9\u4e2a\u5bf9\u8c61\u90fd\u4f1a\u88ab\u56de\u6536\uff0c\u5f31\u5f15\u7528\u7684\u552f\u4e00\u4f5c\u7528\u5c31\u662f\u7528\u6765\u53d6\u5f97\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\u3002JDK1.2\u4e4b\u540e\u63d0\u4f9b\u4e86WeakReference\u7c7b\u6765\u5b9e\u73b0\u8fd9\u4e2a\u3002<\/p>\n

\u7efc\u5408\u4e0a\u8ff0\uff0c\u865a\u5f15\u7528\u7684\u5b58\u5728\u4e5f\u6bd4\u8f83\u6e05\u6670\u4e86\u3002\u5b83\u4e0d\u4ec5\u4e0d\u80fd\u5e2e\u52a9\u5bf9\u8c61\u8eb2\u8fc7GC,\u751a\u81f3\u4e0d\u80fd\u53d6\u5f97\u5bf9\u8c61\u7684\u5b9e\u4f8b\u3002\u552f\u4e00\u5b58\u5728\u7684\u7528\u5904\u5c31\u662f\u5f53\u5176\u5f15\u7528\u7684\u5bf9\u8c61\u88abGC\u56de\u6536\u65f6\u4f1a\u6536\u5230\u4e00\u4e2a\u7cfb\u7edf\u7684\u901a\u77e5\u3002JDK1.2\u4e4b\u540e\u4f7f\u7528PhantomReference\u7c7b\u6765\u5b9e\u73b0\u3002<\/p>\n

###b. C++\u7684\u667a\u80fd\u6307\u9488
\n\u76f8\u6bd4\u4e8eJava\u7684GC\u673a\u5236\u4ee5\u53ca\u4e3aGC\u670d\u52a1\u7684\u5404\u79cd\u5f15\u7528\uff0cC++\u7684\u667a\u80fd\u6307\u9488\u5219\u7a0d\u663e\u7b80\u5355\u3002\u4f46\u662f\u8fd9\u4e2a\u770b\u4f3c\u7b80\u5355\u7684c++\u7684\u667a\u80fd\u6307\u9488\uff0c\u5bf9\u4e8ec++\u6765\u8bf4\u610f\u4e49\u4e5f\u8bb8\u5e76\u4e0d\u662f\u90a3\u4e48\u4f4e\u3002\u5728\u6211\u7684\u7406\u89e3\u4e2d\uff0cc++\u4e4b\u6240\u4ee5\u5b9e\u7528\uff0c\u56e0\u4e3a\u76f8\u5bf9\u4e8ec\uff0cc++\u6709\u7740\u4e30\u5bcc\u9ad8\u6548\u7684STL\u5e93\u548c\u88ab\u5927\u591a\u6570\u5f00\u53d1\u8005\u63a5\u53d7\u7684OOP\u3002\u5bf9\u4e8e\u4e00\u4e2a\u5de8\u5927\u7684\u9879\u76ee\u6765\u8bf4\uff0cOOP\u5f80\u5f80\u53ef\u4ee5\u66f4\u597d\u7684\u5e2e\u52a9\u7cfb\u7edf\u6a21\u5757\u5316\uff0c\u964d\u4f4e\u8026\u5408\uff0c\u800cSTL\u5e93\u5219\u662f\u5f00\u53d1\u8005\u8fdb\u884c\u9ad8\u6548\u5de5\u4f5c\u7684\u57fa\u7840\u3002\u76f8\u5bf9\u4e8eJava,\u5355\u5355\u4ecec++\u6ca1\u6709GC\u673a\u5236\uff0c\u5c31\u610f\u5473\u7740\u5b83\u6709\u7740\u66f4\u9ad8\u7684\u6027\u80fd\uff0c\u53e6\u5916Java\u7684\u865a\u62df\u673a\u4e5f\u662f\u5f71\u54cd\u6027\u80fd\u7684\u4e00\u4e2a\u65b9\u9762\u3002\u53ef\u4e5f\u662f\u56e0\u4e3ac++\u6ca1\u6709GC\u673a\u5236\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u591a\u4eba\u5408\u4f5c\u7684\u5de8\u5927\u7684\u9879\u76ee\u6765\u8bf4\uff0c\u5185\u5b58\u6cc4\u9732\u5219\u662f\u9762\u4e34\u7684\u9996\u8981\u95ee\u9898\u3002\u4e3e\u4e2a\u5f88\u4f4e\u7aef\u7684\u4f8b\u5b50
\n“`c++
\n class Example{
\n Mysql* getMysqlConnect(){
\n Mysql* mysql = new Mysql;
\n return mysql;
\n }
\n };
\n<\/code><\/pre>\n

\u4e00\u4e2a\u9879\u76ee\u4e2d\u6240\u6709\u7684mysql\u5bf9\u8c61\u6307\u9488\u90fd\u901a\u8fc7\u4e0a\u9762\u7684getMysqlConnect()\u83b7\u53d6,\u770b\u4f3c\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u662f\u6ca1\u6709\u4eba\u6562\u4fdd\u8bc1\u4e00\u4e2a\u9879\u76ee\u4e2d\u6240\u6709\u4f7f\u7528\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4eba\u90fd\u4f1a\u5728\u4f7f\u7528\u5b8cmysql\u5bf9\u8c61\u540e\uff0c\u624b\u52a8\u5c06\u5176\u91ca\u653e\u3002\u56e0\u6b64\u8fd9\u91cc\u9700\u8981\u4e00\u4e2ashared_ptr\u6216\u8005unique_ptr\u53bb\u5305\u88c5\u4e00\u4e0b\u6307\u9488\uff0c\u8fd9\u6837\u8c03\u7528\u51fd\u6570\u7684\u4eba\u5c31\u4e0d\u9700\u8981\u5728\u5916\u90e8\u91ca\u653e\u5bf9\u8c61\u5185\u5b58\uff0c\u4e5f\u5c31\u907f\u514d\u4e86\u5185\u5b58\u6cc4\u9732\u7684\u95ee\u9898\u3002\u5f53\u7136\u5728\u4f7f\u7528shared_ptr\u65f6\u4e5f\u4e00\u5b9a\u8981\u6ce8\u610f\uff0c\u56e0\u4e3a\u53ef\u80fd\u4f1a\u51fa\u73b0\u5faa\u73af\u5f15\u7528\u7684\u95ee\u9898\uff0c\u5faa\u73af\u5f15\u7528\u5219\u4f1a\u5bfc\u81f4\u5bf9\u8c61\u5185\u5b58\u4e00\u76f4\u4e0d\u88ab\u91ca\u653e\u3002
\n\u5f53\u7136\u4e86\uff0c\u4e0a\u9762\u7684\u4f8b\u5b50\u53ea\u662f\u4e3a\u4e86\u8bf4\u660e\u8fd9\u4e2a\u4f8b\u5b50\u800c\u5217\u4e3e\u51fa\u6765\u7684\uff0c\u4e8b\u5b9e\u4e0a\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u5bf9\u8c61\u800c\u4e0d\u662f\u6307\u9488\u3002
\nc++
\n class Example{
\n Mysql getMysqlConnect(){
\n Mysql mysql;
\n return mysql;
\n }
\n };<\/code>
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