How to select random values from a given range

Question

I\'m trying to create an android application which will generate random series of values (integer numbers in this case) in a given range (but NOT equal betw

Answer 1

final StringBuilder builder = new StringBuilder();
final Random r = new Random(System.currentTimeMillis());
final Set numbers = new HashSet();

public String getRandomNumbers(int count,int min, int max)
{
    if(count > (max - min) || (max < min))
        throw new IllegalArgumentException("There is an error with the parameters provided");

    builder.setLength(0); //Clear StringBuilder
    numbers.clear(); //Clear the number list

    int i=0;
    while( i < count )
    {
        int aRandomNumber = (r.nextInt() % max) +min;

        if(numbers.contains(aRandomNumber)) // If we have seen this number already
            continue;
        else
        {
            i++;
            numbers.add(aRandomNumber);
            builder.append(aRandomNumber); //Add number to string

            if( i < (count-1) )
                builder.append(", "); // Add a comma if it's not the last number
        }
    }

    String output = builder.toString();
    builder.setLength(0); //A polite clearing
    numbers.clear();

    return output;
}