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Binary Search implementation in java

Posted on December 1, 2021December 1, 2021 By christo No Comments on Binary Search implementation in java

Complete program to implement Binary search in java

import static java.lang.String.format;

import java.util.Arrays;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import java.util.stream.IntStream;
import com.thealgorithms.devutils.searches.SearchAlgorithm;

class BinarySearch implements SearchAlgorithm {

   
    @Override
    public <T extends Comparable<T>> int find(T[] array, T key) {
        return search(array, key, 0, array.length);
    }

    
    private <T extends Comparable<T>> int search(T array[], T key, int left, int right) {
        if (right < left) {
            return -1; // this means that the key not found
        }
        // find median
        int median = (left + right) >>> 1;
        int comp = key.compareTo(array[median]);

        if (comp == 0) {
            return median;
        } else if (comp < 0) {
            return search(array, key, left, median - 1);
        } else {
            return search(array, key, median + 1, right);
        }
    }

    // Driver Program
    public static void main(String[] args) {
        // Just generate data
        Random r = ThreadLocalRandom.current();

        int size = 100;
        int maxElement = 100000;

        Integer[] integers
                = IntStream.generate(() -> r.nextInt(maxElement))
                        .limit(size)
                        .sorted()
                        .boxed()
                        .toArray(Integer[]::new);

        // The element that should be found
        int shouldBeFound = integers[r.nextInt(size - 1)];

        BinarySearch search = new BinarySearch();
        int atIndex = search.find(integers, shouldBeFound);

        System.out.println(
                format(
                        "Should be found: %d. Found %d at index %d. An array length %d",
                        shouldBeFound, integers[atIndex], atIndex, size));

        int toCheck = Arrays.binarySearch(integers, shouldBeFound);
        System.out.println(
                format(
                        "Found by system method at an index: %d. Is equal: %b", toCheck, toCheck == atIndex));
    }
}

Algorithm, java Tags:Binary Search, java

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