//使用数组来构建stack

class stackInArray{

    private Object[] array;//数组

    private int stackBottom ;//stack的底部指向array的地步array[0]

    private int stackTop ;//stack的底部指向array的地步array[0]

    public stackInArray(Object[] o ){

        this.array = o;//指向构造的数组当作stakc的内存

        this.stackBottom = ;

        this.stackTop = ;

    }

    //出栈

    public Object stackPop() {

        Object o = null;

        if(stackTop == ) {

            System.out.println("内存已空，无法出数据");

        }

        else {

            stackTop--;

            o = array[stackTop];

        }

        return o;

    }

    //进栈

    public void stackPush(Object o) {

        if(stackTop == array.length) {

            System.out.println("内存已满，无法存入");

            return ;

        }

        else {

            array[stackTop] = o;

            stackTop++;

        }

    }

}