Java Program to Generate N Number of Passwords of Length M Each

//This is sample program to generate N passwords of length M, where N < M!

import java.util.Random;

import java.util.Scanner;

public class N_Password_M_Length 

{

    static void permute(int []a, int k)

    {

        if(k==a.length)

        {

            for(int i=0; i<a.length; i++)

            {

                System.out.print(a[i]);

            }

            System.out.println();	

        }

        else

        {

            for (int i = k; i<a.length; i++) 

            {

                int temp=a[k];

                a[k]=a[i];

                a[i]=temp;

                permute(a,k+1);

                temp=a[k];

                a[k]=a[i];

                a[i]=temp;

            }

        }	

    }

    public static void main(String args[])

    {

        System.out.println("Enter the length of the password: ");

        Scanner input = new Scanner(System.in);

        int m = input.nextInt();

        Random random = new Random();

        int []a = new int[m];

        for(int i=0; i<m; i++)

        {

            a[i] = random.nextInt(10);

        }

        System.out.println("The Possible Passwords are: ");

        N_Password_M_Length.permute(a, 0);

        input.close();

    }

}