Java array simulation stack operation

package Stack;


//数组模拟栈
public class ArrayStackDemo {
    public static void main(String[] args) {
        ArrayStack stack=new ArrayStack(5);
        stack.push(1);
        stack.push(2);
        stack.push(3);
        stack.push(4);
        stack.push(5);
        stack.list();
        System.out.println("出站后");
        System.out.println(stack.pop());
        System.out.println(stack.pop());
        stack.list();
    }


}

class ArrayStack{

   private int maxSize;
   private int top=-1;//表示栈顶 初始化为-1
   private int stack[];
    public ArrayStack(int max){
        maxSize = max;
        stack=new int[maxSize];
    }
    //判断栈是否满
    public boolean isFull(){
        return top==maxSize-1;
    }
    //判断栈是否为空
    public boolean isEmpty(){
        return top == -1;
    }
    //进栈，栈中添加数据
    public void push(int i){
        if (isFull()){
            throw new RuntimeException("栈满");
        }
        top++;
        stack[top] = i;
    }
    //出栈
    public int pop(){
        if (isEmpty()){
            throw new RuntimeException("栈空");
        }
        int value = stack[top];
        top--;
        return value;
    }
    //显示栈中数据 从top开始
    public void list(){
        if (isEmpty()){
            throw new RuntimeException("栈空");
        }
        for(int i=top;i>-1;i--){
            System.out.println("第"+(i+1)+"个数据"+stack[i]);
        }
    }
}