Binary Search program in java Program: import java.util.*; import java.lang.*; import java.io.*; class Test{ public static void main(String[] args){ int[] arr = {-8,-3,-1,5,7,9}; System.out.println(bin(arr,5)); } public static int bin(int[] arr,int num){ int s = 0; int e = arr.length-1; while(s<=e){ int mid = (s+e)/2; if(num==arr[mid]){ return mid; }else if(num > arr[mid]){ s = mid+1; }else{ e = mid-1; } } return -1; } } Recursive ======= Code: import java.util.*; import java.lang.*; import java.io.*; class Codechef{ public static void main(String[] args){ int[] arr = {-8,-3,-1,5,7,9}; System.out.println(rec(5,arr,0,arr.length-1)); } public static int rec(int val,int[] arr,int s,int e){ if(s<=e){ int mid = (s+e)/2; int cmp = arr[mid]; if(cmp == val){ return mid; }else if(cmp > val){ return rec(val,arr,s,mid-1); }else{ return rec(val,arr,mid+1,e); } }