Collection.shuffle(); using array number

Create ArrayList object wid integer type 

ArrayList<Integer> al = ArrayList<Integer>();

Then you have create for loop how many number you have add into list.
and add() method you have add number into Integer list.

for(int i=1;i<9;i++)
       al.add(i);

Then Collection Class is use. it public class it's work collect all data and using shuffle() method you randomly generate your number.

so you must

import java.util.Collections; 

Collection.shuffle(al);

System.out.println(al);
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Ok.