Question

I need to write a program to read folder path from stdin and all it’s subfolders and then print out the number of files according to their extension.

it will be compiled as follows:

java Summary -r <path>

the output needs to look like:

txt:
  number of files: 5
  combined size: 1202131
  largest file: 729224
  smallest file: 12323
pdf:
  number of files: 2
  etc...

can someone please help me with this? I’m not sure how to approach it.

Answer 1

you can start with something like this for reading files recursively

public void listFilesForFolder(final File folder) {
    for (final File fileEntry : folder.listFiles()) {
        if (fileEntry.isDirectory()) {
            listFilesForFolder(fileEntry);
        } else {
            System.out.println(fileEntry.getName());
        }
    }
}

This code is by @rich.

The rest of the details is something that you have to work out.

You can see Read all files in a folder for more details