【Leetcode】 Simplify Path

题目链接：https://leetcode.com/problems/simplify-path/

题目：

Given an absolute path for a file (Unix-style), simplify it.

For example,
path = "/home/", => "/home"
path = "/a/./b/../../c/", => "/c"

思路：

easy

算法：

public String simplifyPath(String path) {  
        String s[] = path.trim().split("\\/+");  
        Stack<String> stack = new Stack<String>();  
  
        for (String str : s) {  
            if (!str.equals("") && !str.equals(" ") && !str.equals(".") && !str.equals("..")) {  
                stack.push(str);  
            } else if (str.equals("..") && stack.size() != 0) {  
                stack.pop();  
            }  
        }  
        String res = "";// 将栈中剩余元素组合成路径  
        for (int i = 0; i < stack.size(); i++) {  
            res = "/" + stack.get(stack.size() - 1 - i) + res;  
        }  
        if (res.equals("")) // 防止/../情况  
            res = "/";  
        return res;  
    }