The reason for this is that during execution, a thread can pop any number of references from its stack — references that could have been stored elsewhere during execution.
这样做的原因在于，执行期间线程可以从其栈中弹出任意数量的引用——执行过程中可能存储在其他位置的引用。
At the end of the postfix expression, pop a result from the stack.
到后缀表达式末尾，从堆栈中弹出结果。
Arrays respond to push and pop, where push adds an item (at its last spot) and pop removes one (like a stack, from the last position).
Arrays支持push和pop操作，其中push增加项目(在其最后一个位置)而pop移除项目(就像堆栈，从最后一个开始)。
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