Task 1 ArrayList implements the add(int index, E element) method. We cannot use this method if we are using a traditional array. In this task, you are to modify the file Homework05_Task1.java below, and finish writing the insertDouble(double[] array, int index, double element) method so that it properly inserts an element in the array. You should make sure that the index is valid. Example: double[] a = {1, 2, 3, 4, 5}; a = insertDouble(a, 0, 0.5); // a = {0.5, 1, 2, 3, 4, 5}; Homework05_Task1.java /* * Homework05_Task1.java * Finish implementing the insertDouble(double[] array, int index, double element) * method so that it properly inserts an element in the array. */ public class Homework05_Task1 { /** * insertDouble * Inserts an element into the given array the given index. */ public static double[] insertDouble(double[] array, int index, double element) { double[] result = new double[array.length]; // YOUR CODE HERE return result; } public static void main(String[] args) { double[] a = {1, 2, 3, 4, 5, 6, 7, 9, 10}; a = insertDouble(a, 7, 8); for (double e : a) { System.out.printf("%.0f\n", e); } } } Task 2 ArrayList also allows us to easily remove elements. In this task, modify the remove(double[] array, int index) method in the file Homework05_Task2.java below, so that the program properly removes an element from the list. You should make sure that the index is valid. Example: double[] a = {1, 2, 3, 4, 5}; a = remove(a, 2); // a = {1, 2, 4, 5}; Homework05_Task2.java /* * Homework05_Task2.java * Complete the remove(double[] array, int index) method so that the program * properly removes an element from the list. */ public class Homework05_Task2 { /* * remove * Removes the element at the specified index from the list. */ public static double[] remove(double[] array, int index) { double[] result = new double[array.length]; // YOUR CODE HERE return result; } public static void main(String[] args) { double[] a = {10, 9, 8, 7, 6, 5, 4, 3, 2, 1}; a = remove(a, 4); for (double e : a) { System.out.printf("%.0f\n", e); } } } Task 3 Create a method findElement(double[] array, double element) that searches through the given array in order to determine if the given element exist. You should make sure that the index is valid. Example: double[] a = {1, 2, 3, 4, 5}; int index = findElement(a, 3); // index = 2 Task 4 Create a method setElement(double[] array, int index, double element) which changes the element at the given index in the array. You should make sure that the index is valid. Example: double[] a = {1, 2, 3, 4, 5}; setElement(a, 1, 10); // a[1] = 10
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