Added binarySearch.java

binarySearch.java

@@ -0,0 +1,38 @@
+import java.util.Scanner;
+
+public class binarySearch {
+
+    public static int binarySearchFunction(int numbers[],int key){
+        int start = 0, end = numbers.length -1;
+
+        while(start <= end){
+            int mid = (start + end) / 2;
+
+            // comparisons 
+            if(numbers[mid] == key){  // element  found 
+                return mid;
+            }
+            if(numbers[mid] < key){  // element is on right side 
+                start = mid + 1;
+            } else {  // element is on left side 
+                end = mid - 1;
+            }
+        }
+        return -1;
+
+    }
+    public static void main(String args[]){
+        Scanner sc = new Scanner(System.in);
+
+        // prerequisite -> sorted arrays
+
+        int numbers[] = {2,4,6,8,10,12,14};
+        int key = 14;
+
+        System.out.println("Index for key is : " + binarySearchFunction(numbers, key));
+
+        sc.close();
+    }
+}
+
+