三十八毒

public class BubbleSort implements SortStrategy { 
     public void sort(Comparable[] obj) { 
          if (obj == null) { 
              throw new NullPointerException("The argument can not be null!"); 
          } 
          Comparable tmp; 
          for (int i = 0 ;i < obj.length ;i++ )  { 
               for (int j = 0 ;j < obj.length - i - 1 ;j++ ) {  
                     if (obj[j].compareTo(obj[j + 1]) > 0) {  
                             tmp = obj[j]; 
                             obj[j] = obj[j + 1]; 
                             obj[j + 1] = tmp; 

                     }   
               }           
          } 
     } 
}