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- code: 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.…Please add comment on each line Thank you very much! Write a static method, getBigWords, that gets a single String parameter and returns an array whose elements are the words in the parameter that contain more than 5 letters. (A word is defined as a contiguous sequence of letters.) EXAMPLE: So, if the String argument passed to the method was "There are 87,000,000 people in Canada", getBigWords would return an array of two elements, "people" and "Canada". ANOTHER EXAMPLE: If the String argument passed to the method was "Send the request to support@turingscraft.com", getBigWords would return an array of three elements, "request", "support" and "turingscraft".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…
- JAVA, PLEASE THE PROGRAM SHOULD USE THE INITIAL ARRAYLIST AND TO EDIT IT NOT TO CREATE A NEW ONE Create a class called OurArrayList and implement the following methods. Do NOT createany auxiliary memory.Include a main method and test all your methods with appropriate examples.a. Write a method called scaleByK() that takes an ArrayList of integers as aparameter and replaces every integer of value K with K copies of itself. Forexample, if the list stores the values (4, 1 , 2, 0 ,3) before the method is called, itshould store the values (4, 4, 4, 4, 1, 2, 2, 3, 3, 3) after the method finishesexecuting. Zeroes and negative numbers should be removed from the list by thismethodYou will be given an ArrayList of Integers. This ArrayList will have at least 2 items. Starting with the second string in the list, remove it if the string before it comes first alphabetically. Then print the ArrayList. You cannot change the method header! public ArrayList<String> removeStrings(ArrayList<String> arrList) { return null; // Return the ArrayList as well as printing it. }getListRowIndices Method public static java.util.ArrayList<java.lang.Integer> getListRowIndices(int[][] array, int rowLength) This method returns an ArrayList with the indices of rows of the two-dimensional having a length that corresponds to rowLength. You may only use one auxiliary method. The method should create an ArrayList that is passed to the auxiliary in order to place the indices (if any). If no indices are found, an empty (size of 0) ArrayList will be returned. You can assume the array parameter will not be null and every row of the two-dimensional array has an array with a size of at least 0. Your implementation must be recursive and you may not use any loop construct. Do not use ++ or -- in any recursive call argument. It may lead to an infinite recursion. For example, use index + 1, instead of index++. Parameters: array - rowLength - Returns: ArrayList<Integer>
- 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)?java, PLEASE THE METHOD SHOULD USE THE INITIAL ARRAYLIST NOT TO CREATE A NEW ONE Create a class called OurArrayList and implement the following methods. Do NOT create any auxiliary memory.Include a main method and test all your methods with appropriate examples.a. Write a method called scaleByK() that takes an ArrayList of integers as aparameter and replaces every integer of value K with K copies of itself. Forexample, if the list stores the values (4, 1 , 2, 0 ,3) before the method is called, itshould store the values (4, 4, 4, 4, 1, 2, 2, 3, 3, 3) after the method finishesexecuting. Zeroes and negative numbers should be removed from the list by thismethodCreate an ArrayList of strings to store the names of celebrities or athletes. Add five names to the list. Process the list with a for loop and the get() method to display the names, one name per line. Pass the list to a void method. Inside the method, Insert another name at index 2 and remove the name at index 4. Use a foreach loop to display the arraylist again, all names on one line separated by asterisks. After the method call in main, create an iterator for the arraylist and use it to display the list one more time.
- Create an ArrayList of strings to store the names of celebrities or athletes. Add five names to the list. Process the list with a for loop and the get() method to display the names, one name per line. Pass the list to a void method. Inside the method, Insert another name at index 2 and remove the name at index 4. Use a foreach loop to display the arraylist again, all names on one line separated by asterisks. After the method call in main, create an iterator for the arraylist and use it to display the list one more time. See Sample Output. SAMPLE OUTPUT Here is the list Lionel Messi Drake Adele Dwayne Johnson Beyonce Here is the new list * Lionel Messi * Drake * Taylor Swift * Adele * Beyonce Using an iterator, here is the list Lionel Messi Drake Taylor Swift Adele Beyonce Textbook: Introduction to Java Programming and Data Structures, Comprehensive Version, Edition: 11th Author: Y. Daniel Liang Publisher: Pearson ISBN: 9780134670942Java question 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…Java Create an ArrayList of strings to store the names of celebrities or athletes. Add five names to the list. Process the list with a for loop and the get() method to display the names, one name per line. Pass the list to a void method. Inside the method, Insert another name at index 2 and remove the name at index 4. Use a foreach loop to display the arraylist again, all names on one line separated by asterisks. After the method call in main, create an iterator for the arraylist and use it to display the list one more time. See Sample Output. SAMPLE OUTPUT Here is the list Lionel Messi Drake Adele Dwayne Johnson Beyonce Here is the new list * Lionel Messi * Drake * Taylor Swift * Adele * Beyonce Using an iterator, here is the list Lionel Messi Drake Taylor Swift Adele Beyonce