Sortowanie bąbelkowe tablic

package lul;

import java.util.Arrays;
import java.util.Random;


public class LUL {


    public static void main(String[] args) {
int tmp,zmiana=0;
       Random r = new Random();
   int[]tt1 = new int[15];
   for (int i=0; i<tt1.length;i++){
       tt1[i]=r.nextInt(9);
   }
      System.out.println("tablica 1 = "+Arrays.toString(tt1));

   for (int y=0; y<tt1.length-1;y++){
   for (int x=0; x<tt1.length-1;x++){
       if(tt1[x]>tt1[x+1]){
    tmp = tt1[x+1];
    tt1[x+1] = tt1[x];
    tt1[x] = tmp;
    zmiana++;
       }
   }
   }
   System.out.println("tablica 1 = "+Arrays.toString(tt1));

}