Question

The following code skeleton contains a number of uncompleted methods. With a partner, work to complete the method implementations so that the main method runs correctly:

/**
 * DESCRIPTION OF PROGRAM HERE
 * @author YOUR NAME HERE
 * @author PARTNER NAME HERE
 * @version DATE HERE
 *
 */
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class ArrayExercises {

    /**
     * Given a random number generator and a length, create a new array of that
     * length and fill it from left to right with random numbers between 1 and
     * 6.
     *
     * @param rnd
     *            Random number generator to draw numbers from
     * @param len
     *            size of array to create
     * @return array containing random numbers of length len
     */
    public static int[] randomArray(Random rnd, int len) {
        // TODO - complete this function

        // TODO - the following line is only here to allow this program to
        //  compile.  Replace it and remove this comment when you complete
        //  this method.
        return null;
    }

    /**
     * Given an array of ints, returns the sum of the values. The array can be
     * of any length.
     *
     * @param array
     *            array to total
     * @return sum of the elements in the array
     */
    public static int sumArray(int[] array) {
        // TODO - complete this function

        // TODO - the following line is only here to allow this program to
        //  compile.  Replace it and remove this comment when you complete
        //  this method.
        return 0;
    }

    /**
     * Given two arrays of integers of the same size, interleaves the contents
     * of the two arrays with an element of arr1 followed by an element of arr2.
     * For example, if arr1 = < 1, 2, 3 > and arr2 = < 4, 5, 6 >, the array
     * returned by this method should be < 1, 4, 2, 5, 3, 6 >. The behavior of
     * this method is undefined for array parameters of different lengths.
     *
     * @param arr1
     *            first array to interleave
     * @param arr2
     *            second array to interleave
     * @return array of length arr1.length + arr2.length with contents
     *         interleaved as described above.
     */
    public static int[] mergeArrays(int[] arr1, int[] arr2) {
        // TODO - complete this function

        // TODO - the following line is only here to allow this program to
        //  compile.  Replace it and remove this comment when you complete
        //  this method.
        return null;
    }

    /**
     * Simple test program to test the methods given above. Uncomment the
     * relevant portions as you complete the methods above.
     *
     * @param args
     */
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a random seed: ");
        int seed = Integer.parseInt(input.nextLine());
        Random rnd = new Random(seed);
        int[] randomArray1 = randomArray(rnd, 6);
        System.out.print("First random array: ");
        System.out.println(Arrays.toString(randomArray1));
        //        int sum1 = sumArray(randomArray1);
        //        System.out.println("The total is: " + sum1);
        int[] randomArray2 = randomArray(rnd, 6);
        System.out.print("Next random array: ");
        System.out.println(Arrays.toString(randomArray2));
        //        int sum2 = sumArray(randomArray2);
        //        System.out.println("The total is: " + sum2);
        //        int[] merged = mergeArrays(randomArray1, randomArray2);
        //        System.out.print("The arrays merged are: ");
        //        System.out.println(Arrays.toString(merged));
        input.close();
    }

}

When your code runs, it should be able to produce the following transcript - note that with the same seed you should get EXACTLY this transcript:

Enter a random seed: 33
First random array: [4, 4, 6, 6, 5, 2]
The total is: 27
Next random array: [2, 3, 3, 6, 3, 1]
The total is: 18
The arrays merged are: [4, 2, 4, 3, 6, 3, 6, 6, 5, 3, 2, 1]

Answer 1

/**
* DESCRIPTION OF PROGRAM HERE
* @author YOUR NAME HERE
* @author PARTNER NAME HERE
* @version DATE HERE
*
*/
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class ArrayExercises {

   /**
   * Given a random number generator and a length, create a new array of that
   * length and fill it from left to right with random numbers between 1 and 6.
   *
   * @param rnd
   * Random number generator to draw numbers from
   * @param len
   * size of array to create
   * @return array containing random numbers of length len
   */
   public static int[] randomArray(Random rnd, int len) {
       int arr[] = new int[len];

       for (int i = 0; i < len; ++i)
           arr[i] = rnd.nextInt(6) + 1;

       return arr;
   }

   /**
   * Given an array of ints, returns the sum of the values. The array can be of
   * any length.
   *
   * @param array
   * array to total
   * @return sum of the elements in the array
   */
   public static int sumArray(int[] array) {
       int sum = 0;
       for (int i = 0; i < array.length; ++i)
           sum = sum + array[i];
       return sum;
   }

   /**
   * Given two arrays of integers of the same size, interleaves the contents of
   * the two arrays with an element of arr1 followed by an element of arr2. For
   * example, if arr1 = < 1, 2, 3 > and arr2 = < 4, 5, 6 >, the array returned by
   * this method should be < 1, 4, 2, 5, 3, 6 >. The behavior of this method is
   * undefined for array parameters of different lengths.
   *
   * @param arr1
   * first array to interleave
   * @param arr2
   * second array to interleave
   * @return array of length arr1.length + arr2.length with contents interleaved
   * as described above.
   */
   public static int[] mergeArrays(int[] arr1, int[] arr2) {
       int arrnew[] = new int[2 * arr1.length];
       int j = 0, k = 0;
       boolean flag = true;
       for (int i = 0; i < arrnew.length; ++i) {
           if (flag)
               arrnew[i] = arr1[j++];
           else
               arrnew[i] = arr2[k++];
          
           flag = !flag;
       }

       return arrnew;
   }

   /**
   * Simple test program to test the methods given above. Uncomment the relevant
   * portions as you complete the methods above.
   *
   * @param args
   */
   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
       System.out.print("Enter a random seed: ");
       int seed = Integer.parseInt(input.nextLine());
       Random rnd = new Random(seed);
       int[] randomArray1 = randomArray(rnd, 6);
       System.out.print("First random array: ");
       System.out.println(Arrays.toString(randomArray1));
       int sum1 = sumArray(randomArray1);
       System.out.println("The total is: " + sum1);
       int[] randomArray2 = randomArray(rnd, 6);
       System.out.print("Next random array: ");
       System.out.println(Arrays.toString(randomArray2));
       int sum2 = sumArray(randomArray2);
       System.out.println("The total is: " + sum2);
       int[] merged = mergeArrays(randomArray1, randomArray2);
       System.out.print("The arrays merged are: ");
       System.out.println(Arrays.toString(merged));
       input.close();
   }

}

====================================

SEE OUTPUT

OCCU11 U OLLEIŲ LIU as described above. 64 OOORRNO public static int[] mergeArrays(int[] arri, int[] arr2) { int arrnew[] = new int[2 * arri. Length]; int j = 0, k = 0; boolean flag = true; for (int i = 0; i < arrnew.length; ++i) { if (flag) arrnew[i] = arr1[j++]; else arrnew[i] = arr2[k++]; flag = !flag; return arrnew; 79 800 81 /** * Simple test program to test the methods given above. Uncomment the relevant * portions as you complete the methods above. 82 B Console x IX EX <terminated> ArrayExercises (Java Application] /Library/Java/JavaVirtual Machines/jdk1.8.0_202.jdk/Contents/Hon Enter a random seed: 33 First random array: [4, 4, 6, 6, 5, 2] The total is: 27 Next random array: [2, 3, 3, 6, 3, 1] The total is: 18 The arrays merged are: [4, 2, 4, 3, 6, 3, 6, 6, 5, 3, 2, 1]

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