题解 | #有效括号序列#

import java.util.*;


public class Solution {
    /**
     * 
     * @param s string字符串 
     * @return bool布尔型
     */
    public boolean isValid (String s) {
        // write code here
        Stack<Character> stack = new Stack<>();
        for(char c : s.toCharArray()){
            if(c=='('){
                stack.push(')');
            }else if(c=='{'){
                stack.push('}');
            }else if(c=='['){
                stack.push(']');
            }else if(!stack.isEmpty()&&c==stack.peek()){
                stack.pop();
            }else{
                return false;
            }
        }
        return stack.isEmpty();
    }
}