/Java/Java generate secure random password

Java generate secure random password

public class PasswordUtils {

    static char[] SYMBOLS = "^$*.[]{}()?-\"!@#%&/\\,><':;|_~`".toCharArray();
    static char[] LOWERCASE = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    static char[] UPPERCASE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
    static char[] NUMBERS = "0123456789".toCharArray();
    static char[] ALL_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789^$*.[]{}()?-\"!@#%&/\\,><':;|_~`".toCharArray();
    static Random rand = new SecureRandom();

    public static String getPassword(int length) {
        assert length >= 4;
        char[] password = new char[length];

        //get the requirements out of the way
        password[0] = LOWERCASE[rand.nextInt(LOWERCASE.length)];
        password[1] = UPPERCASE[rand.nextInt(UPPERCASE.length)];
        password[2] = NUMBERS[rand.nextInt(NUMBERS.length)];
        password[3] = SYMBOLS[rand.nextInt(SYMBOLS.length)];

        //populate rest of the password with random chars
        for (int i = 4; i < length; i++) {
            password[i] = ALL_CHARS[rand.nextInt(ALL_CHARS.length)];
        }

        //shuffle it up
        for (int i = 0; i < password.length; i++) {
            int randomPosition = rand.nextInt(password.length);
            char temp = password[i];
            password[i] = password[randomPosition];
            password[randomPosition] = temp;
        }

        return new String(password);
    }

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            System.out.println(getPassword(8));
        }
    }
}

Source: stackoverflow.com

Similar codes

1 vote195 views1 answer
Android studio tabbed activity
Java
0 vote195 views2 answers
Void * to int
Java
0 vote225 views1 answer
Fix all 'Implicit call to array '.toString() problems
Java
3 votes197 views3 answers
Java max array
Java
0 vote220 views1 answer
Add view to relativelayout programmatically
Java
7 votes220 views1 answer
Java for character c in string iterate cout i
Java
0 vote263 views1 answer
Java nested array hashcode
Java
0 vote271 views1 answer
Jframe open another frame using button actionlistener
Java
0 vote194 views1 answer
Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
Java
1 vote249 views1 answer
Setting scale to big decimal java
Java