如果目录不存在，如何创建？

var directoryPath = 'path/to/directory';
if (!fs.existsSync(directoryPath)){
    fs.mkdirSync(directoryPath);
    console.log('Directory created successfully.');
} else {
    console.log('Directory already exists.');
}

import os

directory_path = 'path/to/directory'
if not os.path.exists(directory_path):
    os.makedirs(directory_path)
    print('Directory created successfully.')
else:
    print('Directory already exists.')

String directoryPath = "path/to/directory";
File directory = new File(directoryPath);
if (!directory.exists()){
    directory.mkdirs();
    Log.d("TAG", "Directory created successfully.");
} else {
    Log.d("TAG", "Directory already exists.");
}