First half element in array are descending order and remaining are in ascending order : find the index where ascending order start

Rajat.java

public class Rajat {
	static int fun(int[] ary, int l, int r) {
		int mid = l + (r-l+1)/2;
		if(ary[mid-1]>ary[mid] && ary[mid] < ary[mid+1]) {//found index
			return mid;
		}
		if(ary[mid-1]>ary[mid] && ary[mid] > ary[mid+1]) {//go right
			return fun(ary, mid, r);
		}
		if(ary[mid-1] < ary[mid] && ary[mid] < ary[mid+1]) {//go left
			return fun(ary, l, mid);
		}
		return -1;	
	}

	public static void main(String[] args) {
		int[] ary1 = {3,2,1,4,5,6,7};
		System.out.println("ary1	:"+fun(ary1,0,ary1.length-1));
		
		int[] ary = {3,2,1,0,-1,4,5,6,7};
		System.out.println("ary 	:"+fun(ary,0,ary.length-1));
		
		int[] ary2 = {10,9,8,7,6,50};
		System.out.println("ary2 	:"+fun(ary2,0,ary2.length-1));
		
		
	}

}