Java File mkdirs() method with examples

1. Introduction

The mkdirs() method that creates a directory with all given parent directories.

2. Method signature

public boolean mkdirs()

Parameters:

method does not take any parameter

Returns

true - the directory was created, along with all necessary parent directories; false otherwise

Throws

SecurityException - when we do not have access to the file or directory

3. Examples

3.1. Creating directory `aaa` in parent directory `zzz` in parent directory `ttt` in existing directory `\tmp`

package com.frontbackend.java.io;

import java.io.File;

public class FrontBackend {

    public static void main(String args[]) {

        try {
            File ttt = new File("/tmp/ttt/zzz/aaa");

            System.out.println(ttt.exists()); // false - not yet

            if (ttt.mkdirs()) {
                System.out.println("Directories created");
            }

            System.out.println(new File("/tmp/ttt").exists()); // true
            System.out.println(new File("/tmp/ttt/zzz").exists()); // true
            System.out.println(new File("/tmp/ttt/zzz/aaa").exists()); // true

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

The output:

false
Directories created
true
true
true

4. Conclusion

In this article, we presented mkdirs() method that creates a directory in Java with all parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories.