Random numbers

[jithan]

hello friends,

I want to create a random numbers like image verification no it means when we register any of the site it is asking image verification no ........ i have to create that type random no ...... i hope u will help me.......... it s very urgent......

Thanks in advance......

[sukatoa]

Random numbers in java

[jithan]

Thank q Mr.sukatoa...i saw that but i want random alphanumeric values...... pls help me......

[Fubarable]

i saw that but i want random alphanumeric values

Ah, the dreaded "requirement creep". You will do better here to post your full requirements at the beginning of the thread rather than later. What you may do here is create a random number between say 33 and 126 and then cast the number to a char.

for instance:

    int delta = '~' - '!' + 1; // the difference between the top and bottom ascii character
    Random random = new Random();
    for (int i = 0; i < 500; i++)
    {
      char randomChar = (char)(random.nextInt(delta) + '!');      
      System.out.print(randomChar + " ");
      if ((i+1) % 20 == 0)
      {
        System.out.println();
      }
    }