leetcode Min Stack

class MinStack {
    private Stack <Integer> stack = new Stack<Integer>();
    private Stack <Integer> minStack = new Stack<Integer>();
    
    public void push(int x) {
        if(minStack.isEmpty()||x<=minStack.peek())
            minStack.push(x);
        stack.push(x);
    }

    public void pop() {
        if(stack.peek().equals(minStack.peek()))
            minStack.pop();
        stack.pop();
    }

    public int top() {
        return stack.peek();
    }

    public int getMin() {
        return minStack.peek();
    }
    
}