How to select just alphanumeric random choices from an ASCII table?

[royboy75]

Hello,

I need to create a java application which generates random passwords.
I am half way through but what I can't accomplish is select only alphanumeric choices from the ascii table (meaning between 48 and 57 for digits and between 97 and 122 for letters).
Can someone please help?

 

[timw]

char[] chars = new char[]{'a','b','c','d','e','f','g' ..etc};
//use a random index to select characters

Tim

 

[royboy75]

Hi tim,

Thanks for the quick answer.
I prefer using the next() method of Rand.
Is there any way to limit it to this range?

 

[stefanwagner]

48 to 57 is 10 elements.
97 to 122 is 26.

26 + 10 = 36

Pseudocode:

x = rand (36);
if (x > 10) 
        x+= 97;
else 
        x +=48;

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[Diancecht]

You can use Character.isLetter to discrimine the results.

Cheers,
Dian