关于java中“使用了未经检查或不安全的操作、有…

 1 public class Selection{
 2      public static void main(String[]args){
 3          Integer[]a={3,5,7,3,8,27,679,8,564,23};
 4          sort(a);
 5          show(a);
 6      }
 7      public static void sort(Comparable<>[]a){
 8          for(int i=0;i<a.length-1;i++){
 9              int min=i;
10              for(int j=i+1;j<a.length;j++){
11                  if(less(a[j],a[min]))
12                      min=j;
13              }
14              exch(a,i,min);
15          }
16      }
17      private static boolean less(Comparable v,Comparable w){
18          return v.compareTo(w)<0;
19      }
20      private static void exch(Comparable[]a,int i,int j){
21          Comparable t=a[i];
22          a[i]=a[j];
23          a[j]=t;
24      }
25      private static void show(Comparable[]a){
26          for(int i=0;i<a.length;i++){
27              System.out.print(a[i]+"  ");
28          }
29          System.out.println();
30      }
31 }