Question

I’m gonna read a file whose name is partially known. Let’s say I have few files like the followings:

• apple_5_34.jpg
• orange_3_67.bmp
• banana_1_13.gif

And I want to get the InputStream to those files when I only know the words “apple”, “orange” or “banana”.

Any suggestion will be greatly appreciated and thanks in advance.

Answer 1

You have 2 options:

Run in loop on all folder content and check startsWith case for all 3 defined above names.

Or run regex like:

[apple|banana|orange]+([\d\D]+)

or

/\b[apple|banana|orange][^\b]+\b/g

snippets of code

 InputStream in = null;

if(File[i].getName().matches("[apple|banana|orange]+([\d\D]+)")){
 in = new FileInputStream(File[i]);
}