Which of the following statements about ArrayLists is false? O A running program can determine the size of an ArrayList. O You can get an item from a specified index in an ArrayList. O You can add a new item to the end of an ArrayList. Once an ArrayList is created, its size cannot be changed.
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- Question 4: Task 1: Create a generic method named sum() that accepts a generic ArrayList reference and returns the sum of the elements in the ArrayList argument. The generic type is bound to the Number class. The method will throw a NullPointerException is the input argument is null. public static ______________________sum(____________________) { } Task 2: i) Create an ArrayList of 100 random integers taking values between 0 and 1000. ii) Use the sum() method to find the sum in the integer ArrayList. iii) Create an ArrayList of 200 random real numbers taking values between -50.0 and +50.0. iv) Use the sum() method to find the sum in the ArrayList of real numbers. public static void main(String[] args){ } Task 3: Create a recursive method named dec2bin() that takes an integer argument (in decimal format) and returns the binary representation of the input argument as a String. Make sure that the input argument is not negative! public static String…Which accesses the number of elements in groceryList? ArrayList <String> groceryList;groceryList = new ArrayList<String>(); A. groceryList.size B. groceryList.length C. groceryList.length( ) D. groceryList.size( )Which of the following statements about the ArrayList class is/are false?
- Create an ArrayList, Named it Husnain that can hold Integers, and fill each slot with a different random value from 1-50. Display those values on the screen, and then prompt the user for an integer to search through the ArrayList, and if the item is present, say so. It is not necessary to display anything if the value was not found. If the item is in the ArrayList multiple times, it's okay if the program prints the message more than oncecode: public class PasswordGeneratorAndStorage {/*** Adds an application to the applications ArrayList. If index is -1, add application* to the end of applications. Else is index is within the size of applications, add* application at that index in applications. Otherwise, return. However, if applications * or application is null, return.* * @param applications* @param application* @param index*/public static void addApplication(ArrayList<String> applications, String application, int index) {// TODO: FILL IN BODY}/*** Generates a random password of length passwordLength and adds it to the end of* passwords if index is -1, or adds it to the index of passwords if index is within the* size of passwords (similar to how the addApplication adds an application). To generate* the random password, use rand to generate a random int within the size of characters. You* can then use this int to grab the char at that index in characters and concatenate that* to your String password variable.…4. Now examine the ArrayList methods in the above table, a) Which method retrieves elements from the ArrayList? b) Which method replaces the value of an element that already exists in the ArrayList? c) Which two methods initializes the value of an element? d) How do the two methods in (c) differ? Which method(s) would be appropriate in the above Java program (after we convert it to work with ArrayLists)?
- Given two ArrayLists: list1=[10,20,30], and list2=[40,50], what is the content of the list1 after executing the following statement: list1.addAll(list2) a. [40, 50] b. [10, 20, 30] c. [10, 40, 50, 20, 30] d. [10, 20, 30, 40, 50]The UnsortedTableMap class is located in the maps folder. In the attachment, you will find a partially implemented class called UnsortedMapOfLists, which extends UnsortedTableMap. The values associated with the keys in UnsortedMapOfLists are arrays. So you have an array with each key. Off course you can save an array in the value of UnsortedTableMap class without the class we are going to develop, but our class makes this easier, as it allows using a syntax like this: myMap["somekey", 1] to reach element at index 1 in the array associated with key "somekey". I already implemented methods __setitem__ and __getitem__. Your task is to: implement method __delitem__ . Deletion will be performed for an element in the array. If index is not given, delete the array associated with the key. implement a function (not a method in the class) to swap the arrays associated with two given keys. Add the required comment in method __getitem__. implement a main to verify that your code is working…Use the Iterator Pattern: Create a class called Exercise, and then, in its main method, create an ArrayList called stringArrayList. Add the following five strings to stringArrayList: “one”, “two”, ”three”, ”four”, ”five”. Then, use a for loop and the index of stringArrayList to print all these five strings out to the console. 2. For stringArrayList above, can you use an iterator to traverse the five strings inside, without using the index? 3. If change stringArrayList into a TreeSet, how do you traverse the five strings use an iterator? Implement an Iterator: 4. Create a class called StringArray that is able to store a number of String objects. Create an instance variable, String[] values, (internal data storage) of StringArray to store all the strings. 5. Create a constructor for StringArray, which is able to build an object of StringArray using the parameter. public StringArray(String[] values) 6. Make the class StringArray implements Iterable So that it…
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