I have an ArrayList and I want to sort it by increasing string length. The ArrayList class has a method sort(Comparator comp). Give a class that implements the Comparator interface that I can use to sort my ArrayList.
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- A supermarket wants to reward its best customer of each day, showing the customer’s name on a screen in the supermarket. For that purpose, the store keeps an ArrayList.Create a class customer having id, name, gender, and bill provide appropriate getters/setters and constructors also provide toString method.In the Store class, make an ArrayList of customers, store name, and address implement methods public void addSale(Customer c) that will add customers to the arraylist.public void RemoveCustomer(int id);public void UpdateCustomerRecord(int Id);public displayAll();public String nameOfBestCustomer() to record the sale and return the name of the customer with the largest sale. public ArrayList nameOfBestCustomers(int topN) so that it displays the top customers, that is, the topN customers with the largest sales, where topN is a value that the user of the program supplies. Write a program that prompts following menu and ============================================…Please use java. In this assignment, you will implement a class calledCustomIntegerArrayList. This class represents a fancy ArrayList that stores integers and supports additional operations not included in Java's built-in ArrayList methods. For example, the CustomIntegerArrayList class has a “splice” method which removes a specified number of elements from the CustomIntegerArrayList, starting at a given index. For a CustomIntegerArrayList that includes: 1, 2, 3, 4, and 5, calling splice(1, 2) will remove 2 items starting at index 1. This will remove 2 and 3 (the 2nd and 3rd items). The Cu stomIntegerArrayList class has 2 different (overloaded) constructors. (Remember, an overloaded constructor is a constructor that has the same name, but a different number, type, or sequence of parameters, as another constructor in the class.) Having 2 different constructors means you can create an instance of the CustomIntegerArrayList class in 2 different ways, depending on which constructor…Write Java code for the following: Create an Arraylist that can hold Integer objects. Check and display whether the Arraylist is empty or not. Add an element 50 into the Arraylist. Add another element 60 in the position of 0 in the Arraylist. Replace the element to 70 in index 1.
- Write a class Employee with name and salary. Create an ArrayList that sorts the Employees based on salary.Please use java only and public int method. Show the steps with the pictures also. In this assignment, you will implement a class calledArrayAndArrayList. This class includes some interesting methods for working with Arrays and ArrayLists. For example, the ArrayAndArrayList class has a “findMax” method which finds and returns the max number in a given array. For a defined array: int[] array = {1, 3, 5, 7, 9}, calling findMax(array) will return 9. There are 4 methods that need to be implemented in the A rrayAndArrayList class: ● howMany(int[] array, int element) - Counts the number of occurrences of the given element in the given array. ● findMax(int[] array) - Finds the max number in the given array. ● maxArray(int[] array) - Keeps track of every occurrence of the max number in the given array. ● swapZero(int[] array) - Puts all of the zeros in the given array, at the end of the given array. Each method has been defined for you, but without the code. See the javadoc for each…To demonstrate working with ArrayLists, we will be working with four source files: a Dessert class, two classes that extend Dessert called IceCream and Cake, and a TestDessert class. The TestDessert class contains a main() method that declares an ArrayList to hold Dessert objects. This ArrayList is referenced by the variable named "list". Examine TestDessert's main() method and notice the four comments. You are to implement code that accomplishes the tasks described in each step. For step 1, you are to populate the ArrayList with 10 IceCream and Cake objects. These objects should be inserted into the ArrayList at random. This means each run of the program should produce an ArrayList with different proportions of IceCream and Cake objects. After this operation, the ArrayList should contain 10 total objects (IceCream and Cake objects). Display the ArrayList after the operation. For step 2, if the first and last dessert in the ArrayList are different (one is IceCream and the other is…
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- Write a static method concatList() that gets two parameters, an ArrayList of strings and a character. The method will append to the end of every element of the ArrayList (1st parameter) the given character (2nd parameter). Do not write whole program, write only the method. Do not use collection, iterator or other specific classes and their methods, use the knowledge taught in lectures.java Write a program to do the following: Create an ArrayList of Student. Add 7 elements to the ArrayList. Use for each loop to print all the elements of an ArrayList. Remove an element from an ArrayList using the index number. Remove the element from an ArrayList using the content (element name).You are familiar with ArrayList and have used it in different capacities. The most prominent feature of ArrayList is that it expands automatically as elements are added to it. It can be traversed using a for loop, for each loop and iterator( which you have implemented in Lab 2).In this lab you are going to implement your own ArrayList and its functionalities.Task 1.1: Create a class Generic ArrayList with attributes.Task 1.2: Implement a constructor for your ArrayList class.Task 1.3: Implement add() method for adding elements to ArrayList. Remember, ArrayList adds elements dynamically. It doesn't depend on user defined size.Task 1.4: Implement remove() method for removing an element from a specific index. Remember, ArrayList stores elements in a consecutive sequence. If an element is removed from middle you have to re-adjust the elements in the correct sequence. Note: Break down your implementation by defining helper methods for different tasks, rather than implementing your logic in a…