How to find the Size of a Folder &also list the sub folder and files in it

In my program I want to know the size of a folder . The input given is the path of the folder and the ouptut should be the list of files and subfolders with their size. What is the function we have to use for this?
Thank you

class: file
method: listFiles() - list all files of the dir referenced by the file object
method: length() - give the size of the file referenced by the file object ; you have to call this method on all file of the dir to make the sum and have the dir size

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How to find the Size of a Folder &also list the sub folder and files in it

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