random string generator function in java

Question

want a random string generator function in java.

thanks for answer!

Answer 1

The best solution to a problem is usually the easiest one.

class randomstring {

        public static String genString(int length) {

                String string = "";

                java.util.Random random = new java.util.Random();

                int r;

                char c;

                for (int i=0; i < length; i++) {

                        r = random.nextInt(51); //base 52 random (both cases)

                        r++;

                        if (r <= 26) r = r + 64;

                        else if (r > 26) r = r + 70;

                        c = (char) r;

                        string = string + c;

                }

                return string;

        }

 

        public static void main(String args[]) {

                System.out.println(genString(24));

        }

}

 

Comments

Thanks @john its working . and i have modified System.out.println(genString(24));
to System.out.println(genString(5)); Because i need only 5 digitizes random number.
:)

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@John you are right this is the right way, for a random string generated by java function, I used the same logic which you have written here. Thanks for sharing the information.

Answer 2

This Function will give random string every time

public boolean fncGenerateRandString(Keyword objKeyword){

java.util.Random r = new java.util.Random();

    int i = 1, n = 0;

    char c;

    String str="Z";

    for (int t = 0; t < 3; t++) {

        while (true) {

            i = r.nextInt(10);

            if (i > 5 && i < 10) {

                if (i == 9) {

                    i = 90;

                    n = 90;

                    break;

                }

                if (i != 90) {

                    n = i * 10 + r.nextInt(10);

                    while (n < 65) {

                        n = i * 10 + r.nextInt(10);

                    }

                }

                break;

            }

        }

        c=(char)n;

        str= str + String.valueOf(c);

    }

    while(true){

    i = r.nextInt(10000000);

    if(i>999999)

        break;

    }

    str=str+i;

    System.out.println( str);

Enjoy!

Comments

This answer doesn't even make sense!