\u66f4\u751a\u8005\u59b3\u5beb\u7684\u4ee3\u78bc\uff0cGC\u6839\u672c\u5c31\u56de\u6536\u4e0d\u4e86\uff0c\u76f4\u63a5\u7cfb\u7d71\u639b\u6389\u3002GC\u662f\u58f9\u6bb5\u7a0b\u5e8f\uff0c\u4e0d\u662f\u667a\u80fd\uff0c\u4ed6\u53ea\u56de\u6536\u4ed6\u8a8d\u70ba\u7684\u5783\u573e\uff0c\u800c\u4e0d\u662f\u56de\u6536\u59b3\u8a8d\u70ba\u7684\u5783\u573e\u3002
\n\u00a0\u00a0\u00a0 GC\u5783\u573e\u56de\u6536:
\n\u00a0\u00a0\u00a0 Grabage Collection\u76f8\u4fe1\u5b78\u904eJAVA\u7684\u4eba\u90fd\u77e5\u9053\u9019\u500b\u662f\u4ec0\u9ebd\u610f\u601d.\u4f46\u662f\u4ed6\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u5462?
\n\u00a0\u00a0\u00a0 \u9996\u5148\uff0cJVM\u5728\u7ba1\u7406\u5167\u5b58\u7684\u6642\u5019\u5c0d\u65bc\u8b8a\u91cf\u7684\u7ba1\u7406\u7e3d\u662f\u5206\u65b0\u5c0d\u8c61\u548c\u8001\u5c0d\u8c61\u3002\u65b0\u5c0d\u8c61\u4e5f\u5c31\u662f\u958b\u767c\u8005new\u51fa\u4f86\u7684\u5c0d\u8c61\uff0c\u4f46\u662f\u7531\u65bc\u751f\u547d\u5468\u671f\u77ed\uff0c\u90a3\u9ebd\u4ed6\u5360\u7528\u7684\u5167\u5b58\u4e26\u4e0d\u662f\u99ac\u4e0a\u91cb\u653e\uff0c\u800c\u662f\u88ab\u6a19\u8a18\u70ba\u8001\u5c0d\u8c61\uff0c\u9019\u500b\u6642\u5019\u8a72\u5c0d\u8c61\u9084\u662f\u8981\u5b58\u5728\u58f9\u6bb5\u6642\u9593\u3002\u7136\u5f8c\u7531JVM\u6c7a\u5b9a\u4ed6\u662f\u5426\u662f\u5783\u573e\u5c0d\u8c61\uff0c\u4e26\u9032\u884c\u56de\u6536\u3002
\n\u00a0\u00a0\u00a0 \u6240\u4ee5\u6211\u5011\u53ef\u4ee5\u77e5\u9053\uff0c\u5783\u573e\u5167\u5b58\u4e26\u4e0d\u662f\u7528\u5b8c\u4e86\u99ac\u4e0a\u5c31\u88ab\u91cb\u653e\uff0c\u6240\u4ee5\u5c31\u6703\u7522\u751f\u5167\u5b58\u91cb\u653e\u4e0d\u53ca\u6642\u7684\u73fe\u8c61\uff0c\u5f9e\u800c\u964d\u4f4e\u4e86\u5167\u5b58\u7684\u4f7f\u7528\u3002\u800c\u7576\u7a0b\u5e8f\u6d69\u5927\u7684\u6642\u5019\u3002\u9019\u7a2e\u73fe\u8c61\u66f4\u70ba\u660e\u986f\uff0c\u4e26\u4e14GC\u7684\u5de5\u4f5c\u4e5f\u662f\u9700\u8981\u6d88\u8017\u8cc7\u6e90\u7684\u3002\u6240\u4ee5\uff0c\u4e5f\u5c31\u6703\u7522\u751f\u5167\u5b58\u6d6a\u8cbb\u3002
\n\u00a0\u00a0\u00a0 JVM\u4e2d\u7684\u5c0d\u8c61\u751f\u547d\u5468\u671f\u88cf\u8ac7\u5167\u5b58\u56de\u6536:
\n\u00a0\u00a0\u00a0 \u5c0d\u8c61\u7684\u751f\u547d\u5468\u671f\u58f9\u822c\u5206\u70ba7\u500b\u968e\u6bb5\uff1a\u5275\u5efa\u968e\u6bb5\uff0c\u61c9\u7528\u968e\u6bb5\uff0c\u4e0d\u53ef\u8996\u968e\u6bb5\uff0c\u4e0d\u53ef\u5230\u9054\u968e\u6bb5\uff0c\u53ef\u6536\u96c6\u968e\u6bb5\uff0c\u7d42\u7d50\u968e\u6bb5\uff0c\u91cb\u653e\u968e\u6bb5\u3002
\n\u00a0\u00a0\u00a0 \u5275\u5efa\u968e\u6bb5\uff1a\u9996\u5148\u5927\u5bb6\u770b\u58f9\u4e0b,\u5982\u4e0b\u5169\u6bb5\u4ee3\u78bc:
\n\u00a0\u00a0\u00a0 test1:
\n\u00a0\u00a0\u00a0 for( int i=0; i<10000; i++)
\n\u00a0\u00a0\u00a0 Object obj=new Object();
\n\u00a0\u00a0\u00a0 test2:
\n\u00a0\u00a0\u00a0 Object obj=null;
\n\u00a0\u00a0\u00a0 for( int i=0; i<10000; i++)
\n\u00a0\u00a0\u00a0 obj=new Object();
\n\u00a0\u00a0\u00a0 \u9019\u5169\u6bb5\u4ee3\u78bc\u90fd\u662f\u76f8\u540c\u7684\u529f\u80fd\uff0c\u4f46\u662f\u986f\u7136test2\u7684\u6027\u80fd\u8981\u6bd4test1\u6027\u80fd\u8981\u597d\uff0c\u5167\u5b58\u4f7f\u7528\u7387\u8981\u9ad8\uff0c\u9019\u662f\u70ba\u4ec0\u9ebd\u5462?\u539f\u56e0\u5f88\u7c21\u55ae\uff0ctest1\u6bcf\u6b21\u57f7\u884cfor\u5faa\u74b0\u90fd\u8981\u5275\u5efa\u58f9\u500bObject\u7684\u81e8\u6642\u5c0d\u8c61\uff0c\u4f46\u662f\u9019\u4e9b\u81e8\u6642\u5c0d\u8c61\u7531\u65bcJVM\u7684GC\u4e0d\u80fd\u99ac\u4e0a\u92b7\u6bc0\uff0c\u6240\u4ee5\u4ed6\u5011\u9084\u8981\u5b58\u5728\u5f88\u9577\u6642\u9593\uff0c\u800ctest2\u5247\u53ea\u662f\u5728\u5167\u5b58\u4e2d\u4fdd\u5b58\u58f9\u4efd\u5c0d\u8c61\u7684\u5f15\u7528\uff0c\u800c\u4e0d\u5fc5\u5275\u5efa\u5927\u91cf\u65b0\u81e8\u6642\u8b8a\u91cf\uff0c\u5f9e\u800c\u964d\u4f4e\u4e86\u5167\u5b58\u7684\u4f7f\u7528\u3002
\n\u00a0\u00a0\u00a0 \u53e6\u5916\u4e0d\u8981\u5c0d\u540c\u58f9\u500b\u5c0d\u8c61\u521d\u59cb\u5316\u591a\u6b21\u3002\u4f8b\u5982:
\n\u00a0\u00a0\u00a0 public class A{
\n\u00a0\u00a0\u00a0 private Hashtable table = new Hashtable();
\n\u00a0\u00a0\u00a0 public A(){\u00a0\u00a0 table = new Hashtable();
\n\u00a0\u00a0\u00a0 \/\/ \u9019\u88cf\u61c9\u8a72\u53bb\u6389,\u56e0\u70batable\u5df2\u7d93\u88ab\u521d\u59cb\u5316.
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 \u9019\u6a23\u5c31new\u4e86\u5169\u500bHashtable\uff0c\u4f46\u662f\u537b\u53ea\u4f7f\u7528\u4e86\u58f9\u500b\u3002\u53e6\u5916\u58f9\u500b\u5247\u6c92\u6709\u88ab\u5f15\u7528.\u800c\u88ab\u5ffd\u7565\u6389.\u6d6a\u8cbb\u4e86\u5167\u5b58.\u4e26\u4e14\u7531\u65bc\u9032\u884c\u4e86\u5169\u6b21new\u64cd\u4f5c.\u4e5f\u5f71\u97ff\u4e86\u4ee3\u78bc\u7684\u57f7\u884c\u901f\u5ea6\u3002
\n\u00a0\u00a0\u00a0 \u61c9\u7528\u968e\u6bb5\uff1a\u5373\u8a72\u5c0d\u8c61\u81f3\u5c11\u6709\u58f9\u500b\u5f15\u7528\u5728\u7dad\u8b77\u4ed6.
\n\u00a0\u00a0\u00a0 \u4e0d\u53ef\u8996\u968e\u6bb5\uff1a\u5373\u8d85\u51fa\u8a72\u8b8a\u91cf\u7684\u4f5c\u7528\u57df\u3002\u9019\u88cf\u6709\u58f9\u500b\u5f88\u597d\u7684\u505a\u6cd5,\u56e0\u70baJVM\u5728GC\u7684\u6642\u5019\u4e26\u4e0d\u662f\u99ac\u4e0a\u9032\u884c\u56de\u6536,\u800c\u662f\u8981\u5224\u65b7\u5c0d\u8c61\u662f\u5426\u88ab\u5176\u4ed6\u5f15\u7528\u5728\u7dad\u8b77.\u6240\u4ee5,\u9019\u500b\u6642\u5019\u5982\u679c\u6211\u5011\u5728\u4f7f\u7528\u5b8c\u58f9\u500b\u5c0d\u8c61\u4ee5\u5f8c\u5c0d\u5176obj=null\u6216\u8005obj.doSomething()\u64cd\u4f5c,\u5c07\u5176\u6a19\u8a18\u70ba\u7a7a,\u53ef\u4ee5\u5e6b\u52a9JVM\u53ca\u6642\u767c\u73fe\u9019\u500b\u5783\u573e\u5c0d\u8c61.
\n\u00a0\u00a0\u00a0 \u4e0d\u53ef\u5230\u9054\u968e\u6bb5\uff1a\u5c31\u662f\u5728JVM\u4e2d\u627e\u4e0d\u5230\u5c0d\u8a72\u5c0d\u8c61\u7684\u76f4\u63a5\u6216\u8005\u9593\u63a5\u7684\u5f15\u7528\u3002
\n\u00a0\u00a0\u00a0 \u53ef\u6536\u96c6\u968e\u6bb5,\u7d42\u7d50\u968e\u6bb5,\u91cb\u653e\u968e\u6bb5\uff1a\u6b64\u70ba\u56de\u6536\u5668\u767c\u73fe\u8a72\u5c0d\u8c61\u4e0d\u53ef\u5230\u9054,finalize\u65b9\u6cd5\u5df2\u7d93\u88ab\u57f7\u884c,\u6216\u8005\u5c0d\u8c61\u7a7a\u9593\u5df2\u88ab\u91cd\u7528\u7684\u6642\u5019\u3002
\n\u00a0\u00a0\u00a0 JAVA\u7684\u6790\u69cb\u65b9\u6cd5:
\n\u00a0\u00a0\u00a0 \u53ef\u80fd\u4e0d\u6703\u6709\u4eba\u76f8\u4fe1,JAVA\u6709\u6790\u69cb\u51fd\u6578? \u662f\u7684,\u6709\u3002\u56e0\u70baJAVA\u6240\u6709\u985e\u90fd\u7e7c\u627f\u81f3Object\u985e,\u800cfinalize\u5c31\u662fObject\u985e\u7684\u58f9\u500b\u65b9\u6cd5,\u9019\u500b\u65b9\u6cd5\u5728JAVA\u4e2d\u5c31\u662f\u985e\u4f3c\u65bcC++\u6790\u69cb\u51fd\u6578.\u58f9\u822c\u4f86\u8aaa\u53ef\u4ee5\u901a\u904e\u91cd\u8f09finalize\u65b9\u6cd5\u7684\u5f62\u5f0f\u624d\u91cb\u653e\u985e\u4e2d\u5c0d\u8c61.\u5982:
\n\u00a0\u00a0\u00a0 public class A{
\n\u00a0\u00a0\u00a0 public Object a;
\n\u00a0\u00a0\u00a0 public A(){ a = new Object ;}
\n\u00a0\u00a0\u00a0 protected void finalize() throws java.lang.Throwable{
\n\u00a0\u00a0\u00a0 a = null; \/\/ \u6a19\u8a18\u70ba\u7a7a,\u91cb\u653e\u5c0d\u8c61
\n\u00a0\u00a0\u00a0 super.finalize(); \/\/ \u905e\u6b78\u8abf\u7528\u8d85\u985e\u4e2d\u7684finalize\u65b9\u6cd5.
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 \u7576\u7136,\u4ec0\u9ebd\u6642\u5019\u8a72\u65b9\u6cd5\u88ab\u8abf\u7528\u662f\u7531JVM\u4f86\u6c7a\u5b9a\u7684…………………..
\n\u00a0\u00a0\u00a0 \u58f9\u822c\u4f86\u8aaa,\u6211\u5011\u9700\u8981\u5275\u5efa\u58f9\u500bdestory\u7684\u65b9\u6cd5\u4f86\u986f\u5f0f\u7684\u8abf\u7528\u8a72\u65b9\u6cd5.\u7136\u5f8c\u5728finalize\u4e5f\u5c0d\u8a72\u65b9\u6cd5\u9032\u884c\u8abf\u7528,\u5be6\u73fe\u96d9\u4fdd\u96aa\u7684\u505a\u6cd5.
\n\u00a0\u00a0\u00a0 \u7531\u65bc\u5c0d\u8c61\u7684\u5275\u5efa\u662f\u905e\u6b78\u5f0f\u7684,\u4e5f\u5c31\u662f\u5148\u8abf\u7528\u8d85\u7d1a\u985e\u7684\u69cb\u9020,\u7136\u5f8c\u4f9d\u6b21\u5411\u4e0b\u905e\u6b78\u8abf\u7528\u69cb\u9020\u51fd\u6578,\u6240\u4ee5\u61c9\u8a72\u907f\u514d\u5728\u985e\u7684\u69cb\u9020\u51fd\u6578\u4e2d\u521d\u59cb\u5316\u8b8a\u91cf,\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5275\u5efa\u5c0d\u8c61\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u5167\u5b58\u6d88\u8017.\u7576\u7136\u9019\u88cf\u4e5f\u5c31\u770b\u51fa\u4f86\u63a5\u53e3\u7684\u512a\u52e2.
\n\u00a0\u00a0\u00a0 \u6578\u7d44\u7684\u5275\u5efa:
\n\u00a0\u00a0\u00a0 \u7531\u65bc\u6578\u7d44\u9700\u8981\u7d66\u5b9a\u58f9\u500b\u9577\u5ea6,\u6240\u4ee5\u5728\u4e0d\u78ba\u5b9a\u6578\u64da\u6578\u91cf\u7684\u6642\u5019\u7d93\u5e38\u6703\u5275\u5efa\u904e\u5927,\u6216\u904e\u5c0f\u7684\u6578\u7d44\u7684\u73fe\u8c61.\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u5167\u5b58\u6d6a\u8cbb,\u6240\u4ee5\u53ef\u4ee5\u901a\u904e\u8edf\u5f15\u7528\u7684\u65b9\u5f0f\u4f86\u544a\u8a34JVM\u53ca\u6642\u56de\u6536\u8a72\u5167\u5b58.(\u8edf\u5f15\u7528,\u5177\u9ad4\u67e5\u8cc7\u6599).
\n\u00a0\u00a0\u00a0 \u4f8b\u5982:
\n\u00a0\u00a0\u00a0 Object obj = new char[10000000000000000];
\n\u00a0\u00a0\u00a0 SoftReference ref = new SoftReference(obj);
\n\u00a0\u00a0\u00a0 \u5171\u4eab\u975c\u614b\u5b58\u5132\u7a7a\u9593:
\n\u00a0\u00a0\u00a0 \u6211\u5011\u90fd\u77e5\u9053\u975c\u614b\u8b8a\u91cf\u5728\u7a0b\u5e8f\u904b\u884c\u671f\u9593\u5176\u5167\u5b58\u662f\u5171\u4eab\u7684,\u56e0\u6b64\u6709\u6642\u5019\u70ba\u4e86\u7bc0\u7d04\u5167\u5b58\u5de5\u4ef6,\u5c07\u58f9\u4e9b\u8b8a\u91cf\u8072\u660e\u70ba\u975c\u614b\u8b8a\u91cf\u78ba\u5be6\u53ef\u4ee5\u8d77\u5230\u7bc0\u7d04\u5167\u5b58\u7a7a\u9593\u7684\u4f5c\u7528.\u4f46\u662f\u7531\u65bc\u975c\u614b\u8b8a\u91cf\u751f\u547d\u5468\u671f\u5f88\u9577,\u4e0d\u6613\u88ab\u7cfb\u7d71\u56de\u6536,\u6240\u4ee5\u4f7f\u7528\u975c\u614b\u8b8a\u91cf\u8981\u5408\u7406,\u4e0d\u80fd\u76f2\u76ee\u7684\u4f7f\u7528.\u4ee5\u514d\u9069\u5f97\u5176\u53cd\u3002
\n\u00a0\u00a0\u00a0 \u56e0\u6b64\u5efa\u8b70\u5728\u4e0b\u9762\u60c5\u6cc1\u4e0b\u4f7f\u7528:
\n\u00a0\u00a0\u00a0 1,\u8b8a\u91cf\u6240\u5305\u542b\u7684\u5c0d\u8c61\u9ad4\u7a4d\u8f03\u5927,\u5360\u7528\u5167\u5b58\u904e\u591a.
\n\u00a0\u00a0\u00a0 2,\u8b8a\u91cf\u6240\u5305\u542b\u5c0d\u8c61\u751f\u547d\u5468\u671f\u8f03\u9577.
\n\u00a0\u00a0\u00a0 3,\u8b8a\u91cf\u6240\u5305\u542b\u6578\u64da\u7a69\u5b9a.
\n\u00a0\u00a0\u00a0 4,\u8a72\u985e\u7684\u5c0d\u8c61\u5be6\u4f8b\u6709\u5c0d\u8a72\u8b8a\u91cf\u6240\u5305\u542b\u7684\u5c0d\u8c61\u7684\u5171\u4eab\u9700\u6c42.(\u4e5f\u5c31\u662f\u8aaa\u662f\u5426\u9700\u8981\u4f5c\u70ba\u5168\u5c40\u8b8a\u91cf).
\n\u00a0\u00a0\u00a0 \u5c0d\u8c61\u91cd\u7528\u8207GC:
\n\u00a0\u00a0\u00a0 \u6709\u7684\u6642\u5019,\u5982\u6578\u64da\u5eab\u64cd\u4f5c\u5c0d\u8c61,\u58f9\u822c\u60c5\u6cc1\u4e0b\u6211\u5011\u90fd\u9700\u8981\u5728\u5404\u500b\u4e0d\u540c\u6a21\u584a\u9593\u4f7f\u7528,\u6240\u4ee5\u9019\u6a23\u7684\u5c0d\u8c61\u9700\u8981\u9032\u884c\u91cd\u7528\u4ee5\u63d0\u9ad8\u6027\u80fd.\u4e5f\u6709\u6548\u7684\u907f\u514d\u4e86\u53cd\u5fa9\u5275\u5efa\u5c0d\u8c61\u5f15\u8d77\u7684\u6027\u80fd\u4e0b\u964d.
\n\u00a0\u00a0\u00a0 \u58f9\u822c\u4f86\u8aaa\u5c0d\u8c61\u6c60\u662f\u58f9\u500b\u4e0d\u932f\u7684\u8a3b\u610f.\u5982\u4e0b:
\n\u00a0\u00a0\u00a0 public abstarct class ObjectPool{
\n\u00a0\u00a0\u00a0 private Hashtable locked,unlocked;
\n\u00a0\u00a0\u00a0 private long expirationTime;
\n\u00a0\u00a0\u00a0 abstract Object create();
\n\u00a0\u00a0\u00a0 abstract void expire( Object o);
\n\u00a0\u00a0\u00a0 abstract void validate( Object o);
\n\u00a0\u00a0\u00a0 synchronized Object getObject(){…};
\n\u00a0\u00a0\u00a0 synchronized void freeObject(Object o){…};
\n\u00a0\u00a0\u00a0 }
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\n\u00a0\u00a0\u00a0 java -XX:NewSize=128m -XX:MaxNewSize=128m -XX:SurvivorRatio=8 -Xms512m -Xmx512m
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\n\u00a0\u00a0\u00a0 JAVA\u7a0b\u5e8f\u8a2d\u8a08\u4e2d\u6709\u95dc\u5167\u5b58\u7ba1\u7406\u7684\u5176\u4ed6\u7d93\u9a57:
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\n\u00a0\u00a0\u00a0 3,\u5982\u679c\u9700\u8981\u4f7f\u7528\u5230\u5716\u7247,\u53ef\u4ee5\u4f7f\u7528soft\u61c9\u7528\u985e\u578b,\u5b83\u53ef\u4ee5\u76e1\u53ef\u80fd\u5c07\u5716\u7247\u8b80\u5165\u5167\u5b58\u800c\u4e0d\u5f15\u8d77OutOfMemory.
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\n\u00a0\u00a0\u00a0 5,\u76e1\u91cf\u907f\u514d\u5728\u9ed8\u8a8d\u69cb\u9020\u5668(\u69cb\u9020\u51fd\u6578)\u4e2d\u5275\u5efa,\u521d\u59cb\u5316\u5927\u91cf\u7684\u5c0d\u8c61.
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