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Hi i am creating a lottery program and i have managed to get it so the user enters 6 numbers into the program then it will generate random numbers the problem is that the numbers the user enteres can be duplicate i need help trying to not make them duplicates.here is my code so far

```
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;
public class LotteryProgram {
public static void main(String[] args) {
Scanner user_input = new Scanner (System.in);
Scanner keyIn = new Scanner(System.in);
int[] LotteryNumbers = new int[6];
int input;
int count = 0;
System.out.print("Welcome to my lottery program please select how many weeks you wish to play /nand the numbers you wish to use!");
Scanner Weeks_Played = new Scanner(System.in);
String Weeks_Play;
System.out.print ("Enter the amount of weeks you wish to play for: ");
Weeks_Play = Weeks_Played.next();
System.out.println ("You are playing for 3 weeks");
System.out.print("\n\nPress the enter key to continue");
keyIn.nextLine();
for (int i = 0; i < LotteryNumbers.length; i++)
{
count ++;
System.out.println("Enter your five Lottery Numbers now " + count + " (must be between 1 and 49): ");
input = Integer.parseInt(user_input.next());
if (input < 1 || input > 49)
{
while (input < 1 || input > 49)
{
System.out.println("Invalid number entered! \nPlease enter lottery number (between 1 and 49) " + count);
input = Integer.parseInt(user_input.next());
if (input >= 1 || input <= 49)
{
LotteryNumbers[i] = input;
}
}
}
else
{
LotteryNumbers[i] = input;
}
}
System.out.println("Thank you for your numbers.\nThe system will now check if you have any matching numbers");
System.out.print("Press the enter key to continue");
keyIn.nextLine();
Random randNumGenerator = new Random();
StringBuilder output = new StringBuilder();
int[] ActLotteryNumbers = new int[6];
for (int j = 0; j < ActLotteryNumbers.length; j++)
{
int roll = randNumGenerator.nextInt(49);
ActLotteryNumbers[j] = roll;
}
System.out.println(Arrays.toString(ActLotteryNumbers));
int counter = 0;
for (int i = 0; i < LotteryNumbers.length; i++)
{
for (int j = 0; j < ActLotteryNumbers.length; j++)
{
if (LotteryNumbers[i] == ActLotteryNumbers [j])
{
counter ++;
System.out.println("The numbers that match up are: \n" + LotteryNumbers[i]);
}
}
}
if (counter == 0)
{
System.out.println("You had no matching numbers this week ... Try Again next week!");
}
}
}
```

I was thinking of using this piece of small code i found but dont know how to put into the code above without causing problems

```
{
public Set<Integer> LotteryNumbers()
{
Set<Integer> RandomNumbers = new HashSet<Integer>();
Random random = new Random();
for (int i=0; i<6; i++)
RandomNumbers.add(random.nextInt(49));
return RandomNumbers;
}
}
```