72 lines
1.6 KiB
Java
72 lines
1.6 KiB
Java
import java.util.Scanner;
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/**
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*
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* @author Varun Upadhyay (https://github.com/varunu28)
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*
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*/
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class BinarySearch
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{
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/**
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* This method implements the Generic Binary Search
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*
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* @param array The array to make the binary search
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* @param key The number you are looking for
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* @param lb The lower bound
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* @param ub The upper bound
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* @return the location of the key
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**/
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public static <T extends Comparable<T>> int BS(T array[], T key, int lb, int ub)
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{
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if ( lb > ub)
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return -1;
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int mid = (ub+lb) >>> 1;
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int comp = key.compareTo(array[mid]);
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if (comp < 0)
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return (BS(array, key, lb, mid-1));
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if (comp > 0)
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return (BS(array, key, mid + 1, ub));
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return mid;
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}
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// Driver Program
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public static void main(String[] args)
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{
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Scanner input=new Scanner(System.in);
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// For INTEGER Input
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Integer[] array = new Integer[10];
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int key = 5;
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for (int i = 0; i < 10 ; i++ )
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array[i] = i+1;
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int index = BS(array, key, 0, 9);
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if (index != -1)
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System.out.println("Number " + key + " found at index number : " + index);
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else
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System.out.println("Not found");
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// For STRING Input
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String[] array1 = {"a", "b", "c", "d", "e"};
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String key1 = "d";
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int index1 = BS(array1, key1, 0, array1.length-1);
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if (index1 != -1)
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System.out.println("String " + key1 + " found at index number : " + index1);
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else
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System.out.println("Not found");
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input.close();
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}
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}
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