reverse_an_array.java

// 7.Reverse an Array

public class reverse_an_array {
   public static void reverse(int numbers[]){
       int first =0, last = numbers.length-1;

       while (first < last){
           // swap

           int temp = numbers[last];
           numbers[last] = numbers[first];
           numbers[first] = temp;

           first ++;
           last --;
       }
   }

   public static void main(String[] args) {
       int numbers[] = {1,2,3,4,5,6,7,8,9};
       reverse(numbers);
       for (int i = 0; i <numbers.length ; i++) {
           System.out.print(numbers[i] +" ");       // 9 8 7 6 5 4 3 2 1

       }
//        System.out.println();
   }
}