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BinarySearch.java

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public class BinarySearch {

public static int binarySearch(int arr[], int low, int high, int key) {

int mid = (low + high) / 2;

while (low <= high) {

if (arr[mid] < key) {

low = mid + 1;

} else if (arr[mid] == key) {

return mid;

} else {

high = mid - 1;

}

mid = (low + high) / 2;

}

if (low > high) {

return -1;

}

return -1;

}

public static void main(String[] args) {

int intArray[] = {7, 8, 9};

int key = 8;

if (binarySearch(intArray, 0, 5, key) != -1) {

System.out.print("searching `");

System.out.print(key);

System.out.print("` in the array... it's at index ");

System.out.println(binarySearch(intArray, 0, 5, key));

} else {

System.out.println("index not found");

}

}

}