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Java Program for binary search

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Binary Search in Java

In this example, we'll see a Java program to search the array elements using the binary search.

Binary search is used to search a key element from multiple elements and it is faster than linear search.

Program:


class Main{  
public static int binarySearch(int arr[], int first, int last, int key){  
if (last>=first){  
int mid = first + (last - first)/2;  
if (arr[mid] == key){  
return mid;  
}  
if (arr[mid] > key){  
return binarySearch(arr, first, mid-1, key);//search in left subarray  
}else{  
return binarySearch(arr, mid+1, last, key);//search in right subarray  
}  
}  
return -1;  
}  
public static void main(String args[]){  
int arr[] = {10,11,20,22,30,33,40,44,50,55};  
int key = 33;  
int last=arr.length-1;  
int result = binarySearch(arr,0,last,key);  
if (result == -1)  
System.out.println("Element is not found!");  
else  
System.out.println("Element is found at index: "+result);  
}  
}

Output:
Element is found at index: 5

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