min stack

class MinStack {
    Stack<Integer> stack = new Stack();
    Stack<Integer> min = new Stack();

    public MinStack() {


    }

    public void push(int val) {
        stack.push(val);

        if(min.isEmpty() || min.peek()>=val){
          min.push(val);

        }

    }

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

    }

    public int top() {

         return stack.peek();
    }

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

/**
 * Your MinStack object will be instantiated and called as such:
 * MinStack obj = new MinStack();
 * obj.push(val);
 * obj.pop();
 * int param_3 = obj.top();
 * int param_4 = obj.getMin();