They are allocated on the stack or inline and are deallocated when they go out of scope.

结构是在堆栈上或以内联方式分配的，当结构超出范围时将被释放。

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requestDestroyed() - The container calls this method when a servlet request is about go out of scope.

requestDestroyed() —— 当一个 servlet 请求即将离开范围时，容器调用这个方法。

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If you declare them inside a method, they will go out of scope as soon as the method finishes running and the garbage collector will be able to reallocate the memory.

如果在方法内部声明这些变量，则变量将在此方法运行完以后超出范围，垃圾回收器将可以重新分配内存。

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