file hash
How do you save a Hashmap to file to be used again later?
I have a hashmap that consists of profiles which include strings, ints, an ordered linked list, and an array stack. I’m trying to use object output stream to save the instance of the hash map but when it goes to save it says certain things are not serializable. Is there a way to make this work? Is there perhaps an alternate way to save a hashmap. BTW I’m using java.
Unfortunately you cannot save a HashMap object by means of only using core functionality in Java. The good thing is that you have, by all means, can use a Database software to do the job, move the objects and map them to a table.
These are some free database programs compatible with java:
http://developers.sun.com/javadb/ – is included when installing java
http://dev.mysql.com/ – Free for personal use
http://db.apache.org/derby/
The other good alternative is to use a persister library called DB4O. Think of it as ab object database where you can put each elements on your HashMap to be persisted with an external file created by DB40 and be retrieved back as an Object of the same type.
http://www.db4o.com/
Take your time to learn and evaluate those links I’ve given you as it may solve your persistence problem.
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