题目：

题解：

class Solution {public String simplifyPath(String path) {String[] names = path.split("/");Deque<String> stack = new ArrayDeque<String>();for (String name : names) {if ("..".equals(name)) {if (!stack.isEmpty()) {stack.pollLast();}} else if (name.length() > 0 && !".".equals(name)) {stack.offerLast(name);}}StringBuffer ans = new StringBuffer();if (stack.isEmpty()) {ans.append('/');} else {while (!stack.isEmpty()) {ans.append('/');ans.append(stack.pollFirst());}}return ans.toString();}
}