parent.mkdirs

public boolean mkdirs() {
    if (exists()) {
        return false;
    }
    if (mkdir()) {
        return true;
    }
    File canonFile = null;
    try {
        canonFile = getCanonicalFile();
    } catch (IOException e) {
        return false;
    }
    File parent = canonFile.getParentFile();
    return (parent != null && (parent.mkdirs() || parent.exists()) && canonFile.mkdir());
}

`parent.mkdirs()`是Java中用于创建文件夹的方法。如果文件夹已经存在，它会返回false；如果创建成功，它会返回true。如果创建失败，它会尝试创建父文件夹，直到创建成功或者父文件夹已经存在。

这个方法的源码中，首先检查文件夹是否存在，如果存在则返回false；如果不存在，则尝试直接创建文件夹，如果创建成功则返回true。如果创建失败，它会尝试获取规范文件路径，然后获取父文件夹并尝试创建父文件夹，最后再次尝试创建文件夹。

这个方法的作用是确保文件夹存在，如果不存在则创建，如果创建失败则尝试创建父文件夹。

相关问题

file.mkdirs

()The method mkdirs() is a built-in method in Java that creates a directory and all its parent directories if they do not exist. The method returns a boolean value that indicates whether the directory was successfully created or not.

Syntax:

public boolean mkdirs()

Example:

File file = new File("C:/Users/Test/Desktop/MyFolder");
boolean success = file.mkdirs();
if (success) {
System.out.println("Directory created successfully");
} else {
System.out.println("Failed to create directory");
}

In this example, the mkdirs() method is used to create a directory called "MyFolder" on the desktop of the user "Test". The method returns true if the directory was successfully created, and false otherwise. The boolean value is stored in the variable "success", and a message is printed to the console indicating whether the directory was created successfully or not.

File dir = new File(url); if(!dir.exists()){ dir.mkdirs(); }

This code creates a new File object called "dir" with a specified URL. It then checks if the directory exists using the "exists()" method. If the directory does not exist, it creates a new directory using the "mkdirs()" method. The "mkdirs()" method creates any necessary but nonexistent parent directories as well.

Overall, this code is used to ensure that the specified directory exists before attempting to perform any file operations on it.