Question

I in the process of writting a simple java program which reads the contents of the directory
and print out the names of the files and last modified time .

The issue i forsee is , the vault i am reading is pretty huge and there are some case where
the files in a single directory can well exceed 20000.
Using file api

    `file.listFiles()` 

would inturn create 20000 file objects, my concern this
could slow down the process , may be bloat the memory as well.

Is there a way to batch i.e to tell java to scan the directory in terms of 50 files at a time or atleast iterate one file at a time instead of loading all objects in memory at once

Answer 1

You should use a java.nio.file.FileVisitor via java.nio.file.Files.walkFileTree(…). It has been introduced in Java 7 exactly for this use case.