Assign unique value to array.

[Sopheap Panha]

I have tried to find another solution that can output as the code below. It works fine, but it is a bad way to use,because we will be hard if we have more than 10 elements.
So can anyone help me how to assign the unique value to an array that has dynamic element?
Thanks and Regards,
Sopheap Panha

int[] array = new int[5];
Random rd = new Random();
 
array[0] = rd.nextInt(5);
while(array[1] == array[0]){
   array[1] = rd.nextInt(5);
}
while(array[2] == array[0] || array[2] == array[1]){
   array[2] = rd.nextInt(5);
}
while(array[3] == array[0] || array[3] == array[1] || array[3] == array[2]){
   array[3] = rd.nextInt(5);
}
while(array[4] == array[0] || array[4] == array[1] || array[4] == array[2] || array[4] == array[3]){
   array[4] = rd.nextInt(5);
}       
 
for (int a : array) {
System.out.println(a);
}
 

[Rabbit]

Use loops

SomeArray[LowerBound] = RandomNumber
 
For i = LowerBoundOfArray+1 To UpperBoundOfArray
   Do
      hasMatches = False
      intRandom = RandomNumber
 
      For j = LowerBoundOfArray To i-1
         If SomeArray[j] = intRandom Then
            hasMatches = True
         End If
      Next j
   Loop While hasMatches
 
   SomeArray[j] = intRandom
Next i