SearchTestDemo.java Source code

Introduction

Here is the source code for SearchTestDemo.java

Source

import java.util.*;

public class SearchTestDemo {
    public static void main(String args[]) throws Exception {
        int array[] = { 2, 5, -2, 6, -3, 8, 0, -7, -9, 4 };

        // Ensure array sorted
        Arrays.sort(array);
        printArray("Sorted array", array);

        // Search for element in array
        int index = Arrays.binarySearch(array, 2);
        System.out.println("Found 2 @ " + index);

        // Search for element not in array
        index = Arrays.binarySearch(array, 1);
        System.out.println("Didn't find 1 @ " + index);

        // Insert
        int newIndex = -index - 1;
        array = insertElement(array, 1, newIndex);
        printArray("With 1 added", array);

    }

    private static void printArray(String message, int array[]) {
        System.out.println(message + ": [length: " + array.length + "]");
        // Print out sorted array elements
        for (int i = 0, n = array.length; i < n; i++) {
            if (i != 0)
                System.out.print(", ");
            System.out.print(array[i]);
        }
        System.out.println();
    }

    private static int[] insertElement(int original[], int element, int index) {
        int length = original.length;
        int destination[] = new int[length + 1];
        System.arraycopy(original, 0, destination, 0, index);
        destination[index] = element;
        System.arraycopy(original, index, destination, index + 1, length - index);
        return destination;
    }
}