48 lines
1.3 KiB
Java
48 lines
1.3 KiB
Java
package Others;
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import java.util.Collections;
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import java.util.Random;
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import java.util.List;
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import java.util.ArrayList;
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/**
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* Creates a random password from ASCII letters
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* Given password length bounds
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*
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* @author AKS1996
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* @date 2017.10.25
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*/
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class PasswordGen {
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public static void main(String args[]) {
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String password = generatePassword(8, 16);
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System.out.print("Password: " + password);
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}
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static String generatePassword(int min_length, int max_length) {
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Random random = new Random();
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String upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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String lower = "abcdefghijklmnopqrstuvwxyz";
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String numbers = "0123456789";
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String specialChars = "!@#$%^&*(){}?";
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String allChars = upper + lower + numbers + specialChars;
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List<Character> letters = new ArrayList<Character>();
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for (char c : allChars.toCharArray())
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letters.add(c);
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// Inbuilt method to randomly shuffle a elements of a list
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Collections.shuffle(letters);
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StringBuilder password = new StringBuilder();
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// Note that size of the password is also random
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for (int i = random.nextInt(max_length - min_length) + min_length; i > 0; --i) {
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password .append( letters.get(random.nextInt(letters.size())));
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}
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return password.toString();
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}
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}
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