Issue

I have a java lottery game assignment and where I am running a while loop to prevent duplication of numbers in the result. I am getting a list of numbers with no duplicates, however the `System.out.print`

is returning all lines until I get the final one with no duplicates. Is there a way to only print the final “winning” line?

Code below

```
while (numCount<9) {
int randNumber rand.nextInt(99)+1;
if (results[0] randNumber || results[1] randNumber || results[2] randNumber || results[3] randNumber ||
results[4] randNumber || results[5] randNumber || results[6] randNumber || results[7] randNumber
|| results[8] randNumber || results[9] randNumber) {
} else {
Array.setInt(results, numCount, randNumber);
numCount++;
}
System.out.print("The Lottery Numbers are: ");
for (int i0; i<10; i++)
//add a 0 in front of the number is it's less that 10
if (results[i] <10) {
System.out.print("0"+results[i]+" ");
}
}
```

Solution

You can do this simpler, relying on the fact that a `Set`

does not have duplicate objects in it.

```
public static void main(String[] args) {
Random rand new Random();
Set<Integer> winningNumbers new HashSet<>();
while (winningNumbers.size() < 9) {
int randNumber rand.nextInt(99) + 1;
winningNumbers.add(randNumber);
}
System.out.print("The Lottery Numbers are: ");
for (Integer number : winningNumbers) {
//add a 0 in front of the number is it's less that 10
if (number < 10) {
System.out.print("0" + number + " ");
} else {
System.out.print(number + " ");
}
}
}
```

You can even simplify the way you are printing the numbers, relying on `printf()`

and `%02d`

, which means that 0 paddings are used being the maximum width of the printed numbers 2:

```
public static void main(String[] args) {
Random rand new Random();
Set<Integer> winningNumbers new HashSet<>();
while (winningNumbers.size() < 9) {
int randNumber rand.nextInt(99) + 1;
winningNumbers.add(randNumber);
}
System.out.print("The Lottery Numbers are: ");
System.out.printf("%02d %02d %02d %02d %02d %02d %02d %02d %02d", winningNumbers.toArray());
}
```

In your code, just move the line `System.out.print("The Lottery Numbers are: ");`

to before the while loop and the loop `for (int i0; i<10; i++)`

to after the while loop as follows:

```
System.out.print("The Lottery Numbers are: ");
while (numCount<9) {
int randNumber rand.nextInt(99)+1;
if (results[0] randNumber || results[1] randNumber || results[2] randNumber || results[3] randNumber ||
results[4] randNumber || results[5] randNumber || results[6] randNumber || results[7] randNumber
|| results[8] randNumber || results[9] randNumber) {
} else {
Array.setInt(results, numCount, randNumber);
numCount++;
}
}
for (int i0; i<10; i++)
//add a 0 in front of the number is it's less that 10
if (results[i] <10) {
System.out.print("0"+results[i]+" ");
}
```

Answered By – João Dias