题解 | 有效括号序列

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param s string字符串
     * @return bool布尔型
     */
    public boolean isValid (String s) {
        // write code here
        if (s.equals("")) return true;
        Stack<Character> stack = new Stack<>();
        Map<Character, Character> checkMap  = new HashMap<>();
        checkMap.put('(', ')');
        checkMap.put('{', '}');
        checkMap.put('[', ']');
        for (char tempChar : s.toCharArray()) {
            if (tempChar == '[' || tempChar == '{' || tempChar == '(') {
                stack.push(tempChar);
            }else if(tempChar == ']' || tempChar == '}' || tempChar == ')'){
                if(!stack.isEmpty() && checkMap.get(stack.peek()).equals(tempChar)){
                    stack.pop();
                }else{
                    return false;
                }
            }else{
                continue;
            }
        }
        return stack.isEmpty();
    }
}