RotateByReversal.java

public class RotateByReversal {

	public static void main(String[] args) {
		int arr[] ={1,2,3,4,5,6,7};
		RotateByReversal rr = new RotateByReversal();
		rr.reverse(arr, 0, 1);
		rr.reverse(arr, 2, 6);
		rr.reverse(arr, 0, 6);
		for(int i =0;i<arr.length;i++){
			System.out.println(arr[i]);
		}
	}


	public void reverse(int[] a , int start , int end){
		while(start<end){
			int temp = a[start];
			a[start] = a[end];
			a[end] = temp;
			end--;
			start++;
		}
	}

}