Valid Parentheseseasy

public class Main {
    public static boolean isValid(String s) {
        // TODO: use a stack to check valid parentheses
        return false;
    }

    public static void main(String[] args) {
        System.out.println(isValid("()"));      // true
        System.out.println(isValid("()[]{}"));  // true
        System.out.println(isValid("(]"));      // false
    }
}