Method isOpen

ValidParenthesis.java:3–15

(char ch)

class Solution {
    
    public boolean isOpen(char ch)
    {
        switch(ch)
        {
        case '(':
                return true;
         case '{':
                return true;
         case '[':
                return true;
        }
        return false;
    }
    
    public boolean isSame(char str, char stk)
    {