包含min函数的栈 java

import java.util.*;

public class Solution {

    Stack stack = new Stack();
    Stack minStack = new Stack();
    int min=Integer.MAX_VALUE;

    public void push(int node) {
        stack.push(node);
        if(node<=min){
            min=node;
        }
        minStack.push(min);
    }
    public void pop() {
        stack.pop();
        minStack.pop();

    }
    public int min() {
       return Integer.parseInt(minStack.peek().toString());
    }
}