LeetCode: Valid Parentheses

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.

Solution:

public class Solution {
    public boolean isValid(String s) {
        ArrayDeque<Character> stack = new ArrayDeque<Character>();
        for (int i=0; i<s.length(); i++)
        {
            if(s.charAt(i)=='(' || s.charAt(i)=='[' || s.charAt(i)=='{')
                stack.push(s.charAt(i));
            else 
            {
                if(stack.isEmpty())
                    return false;
                char lastOpenParenthesis = stack.pop();
                if((s.charAt(i)==')' && lastOpenParenthesis!= '(') || (s.charAt(i)==']' && lastOpenParenthesis!= '[') || 
                (s.charAt(i)=='}' && lastOpenParenthesis!= '{'))
                    return false;
            }
        }
        return stack.isEmpty();
        
    }
}