How to write a file indexing software in java?

You should look at Lucene it is THE indexing and searching framework in Java.

You should look at Lucene, it is THE indexing and searching framework in Java. For indexing PDF documents, you can use PDFBox that integrates nicely with Lucene.

Thanks . But what if I want to write my own libraries. What approach should I use?

– Lokesh Sah Feb 15 at 12:31.

May be a simpler solution for PDF and other document files take a look at Tika.

Thanks Very much – Lokesh Sah Feb 15 at 12:36.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.