But therein lies a subtle problem : Keys that support hash codes dependent on the contents of mutable fields are vulnerable to a bug that will drive even the most patient Java developer batty. 但是这里也有一个小问题:支持哈希码的键依赖于可变字段的内容,这样容易产生bug,即使最耐心的Java开发人员也会被这些bug逼疯。