为了确定活动性，Java 必须 运行完整的GC，因此可以。
让问题沉睡…如果有人需要更深入地研究，这里就是答案。放心吧。
/hotspot/agent/src/share/vm/services/attachListener.cpp的一部分 来自
openjdk
http://download.java.net/openjdk/jdk7/，
并且您必须接受http://www.gnu.org/licenses/gpl-2.0.html
// Implementation of "inspectheap" command//// Input arguments :-// arg0: "-live" or "-all"static jint heap_inspection(AttachOperation* op, outputStream* out) { bool live_objects_only = true; // default is true to retain the behavior before this change is made const char* arg0 = op->arg(0); if (arg0 != NULL && (strlen(arg0) > 0)) { if (strcmp(arg0, "-all") != 0 && strcmp(arg0, "-live") != 0) { out->print_cr("Invalid argument to inspectheap operation: %s", arg0); return JNI_ERR; } live_objects_only = strcmp(arg0, "-live") == 0; } VM_GC_HeapInspection heapop(out, live_objects_only , true ); VMThread::execute(&heapop); return JNI_OK;}在vmGCOperations.hpp中，这是定义
`VM_GC_HeapInspection(outputStream* out, bool request_full_gc, bool need_prologue) :`
