Generating unique random number in java

I want to generate random number from 1 to 9 and i want them to be unique. This is the code i have written which gives me 9 different numbers from 1 to 9 but I have no clue on generating unique number.

 int data[] = new int[10];
      for(int i = 0; i < data.length; i++) {
            Random randomGenerator = new Random();

            data[i] = randomGenerator.nextInt(10);
          System.out.println(data[i]);

        }