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Generating password in Java
Generate temporary password is now a requirement on almost every website now-a-days. In case a user forgets the password, system generates a random password adhering to password policy of the company. Following example generates a random password adhering to following conditions −
It should contain at least one capital case letter.
It should contain at least one lower-case letter.
It should contain at least one number.
Length should be 8 characters.
It should contain one of the following special characters: @, $, #, !.
Example
import java.util.Random;
public class Tester{
public static void main(String[] args) {
System.out.println(generatePassword(8));
}
private static char[] generatePassword(int length) {
String capitalCaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String lowerCaseLetters = "abcdefghijklmnopqrstuvwxyz";
String specialCharacters = "!@#$";
String numbers = "1234567890";
String combinedChars = capitalCaseLetters + lowerCaseLetters + specialCharacters + numbers;
Random random = new Random();
char[] password = new char[length];
password[0] = lowerCaseLetters.charAt(random.nextInt(lowerCaseLetters.length()));
password[1] = capitalCaseLetters.charAt(random.nextInt(capitalCaseLetters.length()));
password[2] = specialCharacters.charAt(random.nextInt(specialCharacters.length()));
password[3] = numbers.charAt(random.nextInt(numbers.length()));
for(int i = 4; i< length ; i++) {
password[i] = combinedChars.charAt(random.nextInt(combinedChars.length()));
}
return password;
}
}Output
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Updated on: 21-Jun-2020
11K+ Views
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