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Storing unique random numbers
Im trying to store random id's in my code , but im trying to figure out how to store only unique id's how would i do that ?
public void storeCustomer (Customer newCustomer)
{
if(newCustomer.getCustomerID().equals("unknown"))
{
newCustomer.generatorCustomerID("ab-",6);
customerMap.put(newCustomer.getCustomerID(),newCus tomer);
}
else
{
customerMap.put(newCustomer.getCustomerID(),newCus tomer);
}
}
Re: Storing unique random numbers
How would you do this without a computer? Say you have a 100-sided die. You want to generate a list of 10 unique random numbers. What do you do?
Write out instructions that you could hand to a stranger to have them accomplish the goal, and when you have that, you'll have an algorithm that you can implement.
--- Update ---
Nevermind, crossposted.
This thread has been cross posted here:http://www.java-forums.org/new-java/71377-storing-unique-random-numbers.html
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Re: Storing unique random numbers
well u do a id by string followed by 6 random numbers then adds to the map . but how would u just add n not use it again
Re: Storing unique random numbers
I wouldn't use a Map. But since I don't know what help you've already received, I'm not going to waste my time repeating what you might have already heard.
This is why we ask people not to crosspost, or to at least let us know when they do so.
Good luck.
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