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PasswordGen.java

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package Others;

import java.util.Collections;

import java.util.Random;

import java.util.List;

import java.util.ArrayList;

/**

* Creates a random password from ASCII letters

* Given password length bounds

*

* @author AKS1996

* @date 2017.10.25

*/

class PasswordGen {

public static void main(String args[]) {

String password = generatePassword(8, 16);

System.out.print("Password: " + password);

}

static String generatePassword(int min_length, int max_length) {

Random random = new Random();

String upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

String lower = "abcdefghijklmnopqrstuvwxyz";

String numbers = "0123456789";

String specialChars = "!@#$%^&*(){}?";

String allChars = upper + lower + numbers + specialChars;

List<Character> letters = new ArrayList<Character>();

for (char c : allChars.toCharArray())

letters.add(c);

// Inbuilt method to randomly shuffle a elements of a list

Collections.shuffle(letters);

String password = "";

// Note that size of the password is also random

for (int i = random.nextInt(max_length - min_length) + min_length; i > 0; --i) {

password += letters.get(random.nextInt(letters.size()));

}

return password;

}

}