反转数组Java

      public class day0 {
          public static void main(String[] args) {
              int [] a = {19,28,37,6,50};
              System.out.println("反转后的数组为：");
              reverse(a);
              printArray(a);
          }

          public static void reverse(int [] arr){
              for(int start=0, end= arr.length-1;start<=end;start++,end--){
                  int temp = arr[start];
                  arr [start] = arr [end];
                  arr [end] = temp;
              }
          }

          public static void printArray(int [] arr){
              System.out.println("[");
              for(int i =0;i< arr.length;i++){
                  if(i== arr.length-1){
                      System.out.println(arr[i]);
                  }else{
                      System.out.println(arr[i]+", ");
                  }
              }
              System.out.println("]");
          }
}