先上题目：
Given a string containing just the characters ‘(‘, ‘)‘, ‘{‘, ‘}‘, ‘[‘ and ‘]‘,
determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are
all valid but "(]" and "([)]" are
not.
自己写的答案，测试通过
public class Solution {
public boolean isValid(String s) {
LinkedList<Character> stack = new LinkedList<Character>();
for(char c:s.toCharArray())
{
if(!stack.isEmpty())
{
if(stack.peek()==40&&c==41||stack.peek()==91&&c==93||stack.peek()==123&&c==125)
{
stack.pop();
}else
{
stack.push(c);
}
}else
{
stack.push(c);
}
}
return stack.isEmpty()?true:false;
}
}
LeetCode中Valid Parentheses的JAVA实现
原文：http://blog.csdn.net/snchenjt/article/details/46117219