1.創建棧
Stack stack=new Stack(); //Object型
Stack stack = new Stack();//int型
Stack stack = new Stack();
Stack stack = new Stack();//int型
Stack stack = new Stack();//int型
Stack stack = new Stack();//int型
2.判空(true or false)
stack.empty();
3.進棧
stack.push(Object);
4.出棧
stack.pop();
5.棧頂值
stack.peek();