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Asked: 2026-05-25T17:55:40+00:00

I’ve got a question about storing huge amount of Strings in application memory. I

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I’ve got a question about storing huge amount of Strings in application memory. I need to load from file and store about 5 millions lines, each of them max 255 chars (urls), but mostly ~50. From time to time i’ll need to search one of them. Is it possible to do this app runnable on ~1GB of RAM?

Will 

ArrayList <String> list = new ArrayList<String>();

work?

As far as I know String in java is coded in UTF-8, what gives me huge memory use. Is it possible to make such array with String coded in ANSI?

This is console application run with parameters:

java -Xmx1024M -Xms1024M -jar "PServer.jar" nogui
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1 Answer

  1. Editorial Team

    The latest JVMs support -XX:+UseCompressedStrings by default which stores strings which only use ASCII as a byte[] internally.

    Having several GB of text in a List isn’t a problem, but it can take a while to load from disk (many seconds)

    If the average URL is 50 chars which are ASCII, with 32 bytes of overhead per String, 5 M entries could use about 400 MB which isn’t much for a modern PC or server.

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