题解 | #有效括号序列#

import java.util.*;
public class Solution {
    public boolean isValid (String s) {
      if(s.length() == 0){
        return false;
      }
      Stack<Character> stack = new Stack<Character>();
      for(char itmp : s.toCharArray()){
		//先传入的左括号赋值到栈中为要匹配的数据
        if(itmp == '('){
            stack.push(')');
        }else if(itmp == '{'){
            stack.push('}');
        }else if(itmp == '['){
            stack.push(']');
        }else if(stack.empty() || stack.pop() != itmp){
		  //下一个不能匹配到相结合的数据则FALSE
            return false;
        }
      } 
    return stack.empty();
    }
}