如何将文件系统路径转换为字符串

path = '/home/user/documents'
filename = 'file.txt'
file_path = path + '/' + filename

import os

path = '/home/user/documents'
filename = 'file.txt'
file_path = os.path.join(path, filename)

import java.nio.file.Path;
import java.nio.file.Paths;

String path = "/home/user/documents";
String filename = "file.txt";
Path filePath = Paths.get(path, filename);
String fileString = filePath.toString();