有无回传值的差别?

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class Sort{ void print(int[] a1){ for(int i=0; i<a1.length; i++){ System.out.print(a1[i]+", "); } }
  void println(int[] a1){ print(a1); System.out.println(); }
/* void bubbleSort(int[] a1){ for(int k=0; k<a1.length-1; k++){ for(int i=a1.length-1; i>k; i--){ if(a1[i]<a1[i-1]){ int temp=a1[i]; a1[i]=a1[i-1]; a1[i-1]=temp; } } } }
*/
  int[] bubbleSort(int[] a1){ for(int k=0; k<a1.length-1; k++){ for(int i=a1.length-1; i>k; i--){ if(a1[i]<a1[i-1]){ int temp=a1[i]; a1[i]=a1[i-1]; a1[i-1]=temp; } } } return a1; }
}
 
class testSort{ public static void main(String[] _){ int[] a2={ 9, 2, 5, 20, 3}; Sort s=new Sort(); s.println(a2); s.bubbleSort(a2); s.println(a2); }
}