LeetCode/com/zerroi/leetcode/Three21/SimplifyPath.java

package com.zerroi.leetcode.Three21;


import java.util.Queue;
import java.util.Stack;

public class SimplifyPath {
    public static void main(String[] args) {
        SolutionSecond solutionSecond = new SolutionSecond();
//        String s = solutionSecond.simplifyPath("/a//b////c/d//././/..");
        String s = solutionSecond.simplifyPath("/../");
        System.out.println("s = " + s);

    }
}

class SolutionSecond {
    public String simplifyPath(String path) {
        String[] strs = path.split("/");
        Stack<String> stack = new Stack<>();

        for (String str : strs) {
            if ("..".equals(str)) {
                if (!stack.isEmpty()) stack.pop();
            } else if (!str.isEmpty() && !str.equals(".")) {
                stack.push(str);
            }
        }
        StringBuffer res = new StringBuffer();
        if (stack.isEmpty()) {
            res.append("/");
        } else {
            while (!stack.isEmpty()) {
                res.append("/");
                res.append(stack.removeFirst());
            }
        }

        return res.toString();
    }
}