Question

I have a character array as shown below :

char[] pwdCharArray = "abcdefghijklmnopqrstuvwxyzABCDEFG" +
            "HIJKLMNOPQRSTUVWXYZ0123456789`~!@#$%^&*()-_=+[]{}\\|;:'\",<" + 
            ".>/?".ToCharArray();

and from this char array, i want to generate a string of minimum length 7 and all the characters in the string should be from the above char array.
How to do this operation?

Answer 1

Generate 7 random numbers between 0 and yourArray.length -1.
Pick the corresponding char in the array and put it in your final String.

Here is the code with a StringBuilder:

StringBuilder sb = new StringBuilder();
Random random = new Randdom();
for(int i=0; i<7; i++) {
    sb.append(pwdCharArray[random.nextInt(0, pwdCharArray.length -1)]);
}
return sb.toString();