class Demo
{
  public static void main(String[] args)
{
    int[] arr = {23,43,54,324,51,23,34,52,23,23,43,58,57};
     System.out.println(Arrays.toString(arr));
      System.out.println("51在数组的位置是:"+Arrays.binarySearch(arr,51));
  }
}

class Demo
{
  public static void main(String[] args)
{
    int[] arr = {23,43,54,324,51,23,34,52,23,23,43,58,57};
     System.out.println(Arrays.toString(arr));
      System.out.println("51在数组的位置是:"+Arrays.binarySearch(arr,51));
  }
}