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Linear Search in java

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

Complete implementation of Linear search in java

import java.util.Random;
import java.util.stream.Stream;
import com.thealgorithms.devutils.searches.SearchAlgorithm;

/**
 * Linear search is the easiest search algorithm It works with sorted and
 * unsorted arrays (an binary search works only with sorted array) This
 * algorithm just compares all elements of an array to find a value
 *
 * <p>
 * Worst-case performance O(n) Best-case performance O(1) Average performance
 * O(n) Worst-case space complexity
 *
 */
public class LinearSearch implements SearchAlgorithm {

    /**
     * Generic Linear search method
     *
     * @param array List to be searched
     * @param value Key being searched for
     * @return Location of the key
     */
    @Override
    public <T extends Comparable<T>> int find(T[] array, T value) {
        for (int i = 0; i < array.length; i++) {
            if (array[i].compareTo(value) == 0) {
                return i;
            }
        }
        return -1;
    }

    public static void main(String[] args) {
        // just generate data
        Random r = new Random();
        int size = 200;
        int maxElement = 100;
        Integer[] integers
                = Stream.generate(() -> r.nextInt(maxElement)).limit(size).toArray(Integer[]::new);

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

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

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

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