简单的说就是：哈希桶（Hash Bucket）指向对象句柄（Object Handles），对象句柄存有对象所占的堆内存的地址。由于对象的堆往往不只一个，Oracle习惯称这些堆为子堆。
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Chain the receiving objects and pass the request along the chain until an object handles it.
将这些对象连成一个链，并沿着这条链传递请求，知道有对象处理它为止。
Chain the receiving objects and pass the request along the chain until an object handles it.
将这些对象连成一条链，并沿着这条链传递该请求，直到有一个对象处理它位置。
Chain the receiving objects and pass the request along the chain until an object handles it.
将接收对象串联成链，请求在链上传递，直到被一个对象处理。
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