Sun JDK 使用一种称为 卡片标记（card marking）算法的改进算法以标识对老一代对象的字段中包含的指针的修改。
The Sun JDKs use an optimized variant of an algorithm called card marking to identify modifications to pointers held in fields of old-generation objects.
消息指针(Message Cursors)是新的内存模型的一部分，当有可用的空间时(对持久化的消息使用存储指针)，它可以在存储地对消息进行分页。
Message cursors are part of a new memory model that allows messages to be paged in from storage when space is available (using Store cursors for persistent messages).
对大多数的编译器来说，如果使用未初始化的指针，会将指针中存放的不确定值视为地址，然后操纵该内存地址中存放的位内容。
Under most compilers, if we use an uninitialized pointer the effect will be to use whatever bits are in the memory in which the pointer resides as if it were an address.
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