Random Range orders

I want to make a special random.

private Randomizer getNumberRnd;
getNumberRnd = new Randomizer(1, 10, true);
    firstNumber = getNumberRnd.getRandom();

I want to get 6 random numbers to be close.

For example: 7,6,5,8,9,5

As I see from 1 to 10, so how do I get these numbers random and close?