This is the java program to generate N passwords each of length M given by the user. The number of passwords, N, returned doesn’t exceed M!.
Here is the source code of the Java Program to Generate N Number of Passwords of Length M Each. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.
//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();
}
}
Output:
$ javac N_Password_M_Length.java $ java N_Password_M_Length Enter the length of the password: 5 The Passwords are: 31210 31201 31120 31102 31012 31021 32110 32101 32110 32101 32011 32011 31210 31201 31120 31102 31012 31021 30211 30211 30121 30112 30112 30121 13210 13201 13120 13102 13012 13021 12310 12301 12130 12103 12013 12031 11230 11203 11320 11302 11032 11023 10213 10231 10123 10132 10312 10321 21310 21301 21130 21103 21013 21031 23110 23101 23110 23101 23011 23011 21310 21301 21130 21103 21013 21031 20311 20311 20131 20113 20113 20131 11230 11203 11320 11302 11032 11023 12130 12103 12310 12301 12031 12013 13210 13201 13120 13102 13012 13021 10231 10213 10321 10312 10132 10123 01213 01231 01123 01132 01312 01321 02113 02131 02113 02131 02311 02311 01213 01231 01123 01132 01312 01321 03211 03211 03121 03112 03112 03121
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