Description: 6, write a Java application, file name Folder.java, compiled results of the implementation as shown below, to achieve the specified folders and files under the directory tree structure displayed in text form. Requirements:
1. Enter: java Folder, shows the current folder and files under the directory tree displayed in text form
2. Enter: java Folder C: \ test>, shows C: \ test folder under the directory tree and display text files (C: \ test folder path can be any name)
3. Enter: java Folder add aa, following in the current folder to add a subdirectory (subdirectory named: aa), also shows the current folder and files under the latest catalog tree display text form
4. Enter: java Folder del aa, following in the current folder delete a subdirectory (subdirectory named: aa), also shows the current folder and files under the latest catalog tree display text form (30 points)
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Folder.java
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