java获取当前目录及父目录和兄弟目录

import java.io.*;public class test{    public static void main(String[] args) {                // get current dirFile file = new File(System.getProperty("user.dir"));// get parent dirString parentPath = file.getParent(); #System.out.println(parentPath);// get brother dirString toolPath = parentPath + "/tool";#System.out.println(toolPath);    }}