배열에 중복값 없는 난수 생성

public void practice13() {

           int[] arr = new int[10];

                      

           for(int i=0; i<arr.length; i++) {

                       arr[i] = (int)(Math.random()*10);

                       for(int j=0; j<i; j++) {

                                  if(arr[i]==arr[j]) {

                                              i--;

                                  }

                       }

           }

          

           for(int i=0; i<arr.length; i++) {

                      System.out.print(arr[i]+" ");

           }

}