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package com.stack_and_queue;

/**

* @author xjn

* @since 2019-12-07

*/

public interface Stack<E> {

/*** 向栈中添加元素 ***/

void push(E e);

/*** 弹出栈顶元素 ***/

E pop();

/*** 查看栈顶元素 ***/

E peek();

int getSize();

boolean isEmpty();

}