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A Java program can write data to a file on disk.

You can post your questions here on the forum. There are lots of people here that will try to help.

There are many parts to this. Too many to cover here.

A starting place is the Java tutorial: The Really Big Index

This program will require more than a beginner.

How is the data being received in the program? Does it come via a socket?
When it receives the data, it can cause a method to display it and wait...

Java should be able to display the data it receives when it receives it.