Merge pull request #287 from aka4rKO/patch-1

Create binary_search.java

code/aka4rKO.java

@@ -0,0 +1,48 @@
+
+// Java implementation of recursive Binary Search 
+class BinarySearch 
+{ 
+    // Returns index of x if it is present in arr[l.. 
+    // r], else return -1 
+    int binarySearch(int arr[], int l, int r, int x) 
+    { 
+        if (r>=l) 
+        { 
+            int mid = l + (r - l)/2; 
+  
+            // If the element is present at the  
+            // middle itself 
+            if (arr[mid] == x) 
+               return mid; 
+  
+            // If element is smaller than mid, then  
+            // it can only be present in left subarray 
+            if (arr[mid] > x) 
+               return binarySearch(arr, l, mid-1, x); 
+  
+            // Else the element can only be present 
+            // in right subarray 
+            return binarySearch(arr, mid+1, r, x); 
+        } 
+  
+        // We reach here when element is not present 
+        //  in array 
+        return -1; 
+    } 
+  
+    // Driver method to test above 
+    public static void main(String args[]) 
+    { 
+        BinarySearch ob = new BinarySearch(); 
+        int arr[] = {2,3,4,10,40}; 
+        int n = arr.length; 
+        int x = 10; 
+        int result = ob.binarySearch(arr,0,n-1,x); 
+        if (result == -1) 
+            System.out.println("Element not present"); 
+        else
+            System.out.println("Element found at index " +  
+                                                 result); 
+    } 
+} 
+/* This code is contributed by Rajat Mishra */