If you apply the Visitor design pattern in your design, it becomes easy to add new ConcreteElement classes to the Element hierarchy. Is this true or false?
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If you apply the Visitor design pattern in your design, it becomes easy to add new ConcreteElement classes to the Element hierarchy. Is this true or false?
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- How can you evaluate the state of an ArrayList to assess how effectively it is functioning?Are there obvious improvements that could be made here with respect the software design for Squares and Circles? What programming constructs were you familiar with, and which did you need to look up? Assume we used a separate array for Squares and for Circles rather than one unifying Object array. How would this complicate the task of adding a new Shape (say, a Triangle) to our ObjectList class?Write assignments to the library, cs101, and track variables (which you defined in the previous three exercises) to create the appropriate ArrayList objects. Write them once using diamond notation and once without diamond notation, specifying the full type.
- Help, I am making a elevator simulation using polymorphism. I am not sure to do now. Any help would be appreciated. My code is at the bottom, that's all I could think off. There are 4 types of passengers in the system:Standard: This is the most common type of passenger and has a request percentage of 70%. Standard passengers have no special requirements.VIP: This type of passenger has a request percentage of 10%. VIP passengers are given priority and are more likely to be picked up by express elevators.Freight: This type of passenger has a request percentage of 15%. Freight passengers have large items that need to be transported and are more likely to be picked up by freight elevators.Glass: This type of passenger has a request percentage of 5%. Glass passengers have fragile items that need to be transported and are more likely to be picked up by glass elevators. public abstract class Passenger { public static int passangerCounter = 0; private String passengerID; protected…This lab was designed to reinforce programming concepts from this lab, you will practice: Declaring and initializing ArrayList. Add elements to the Arraylist. Display the content of the ArrayList. Write a class name PhoneBookEntry that has fields for a person’s name and phone number. The class should have a constructor and the appropriate accessor and mutator methods. Then write a program that creates at least 5 PhoneBookEntry objects and stores them in an ArrayList. Use a loop to display the contents of each object in the ArrayList.How can you evaluate an ArrayList's effectiveness?
- AVA code OVERVI EW This is a review exercise, so the primary goal of the exercise is to get your mind working and in the correct space.In this activity you will create a imaginary grid of locations that goes from −?≤?≤?, −?≤?≤?, with the coordinate (0,0) being "home". On this grid you will keep track of various animal objects as they move around the grid. Make sure that all animals stay within that grid at all timesincluding when they are created. Zwill be the map size and will control the highest number allowed on themap before wraping around. Using Java, create the following classes and primary program that uses the classes that you developed. INS T RUCT IONS Create the following classes. A N I MA L C LA SS Create an Animal class. Each animal has a name, an x and y integer coordinate. The Animal class should have at minimum the following methodsbelowbut you may want to add more if necessary: Also note, everyanimal will need to have to have “z”passed to it so that it knows how big the…Say we are about to build an ArrayList. Your ArrayList should guarantee that the array capacity is at most four times the number of elements. What would you like to do to maintain such a limit on the capacity? What is the benefit of using iterators? Can you describe your first experience of GUIs? And could you describe what is the advantage of using GUIs over Command-Line Interface (CLI) operations?use the design pattern for collecting objects. We are going to model a Orchard with trees. An Orchard uses an ArrayList to keep track of Tree objects. You will write both a Orchard class and a Tree class. A Tree has a type and a height. Provide a constructor that takes type and height, in that order. Provide getters and setters for the instance variables. This is the design pattern for managing properties of objects. An Orchard has a constructor that takes no parameters. Remember it must initialize the instance variable. It also has methods ○ add() Adds the specified Tree to the Orchard ○ tallest() Gets the type of the tallest Tree in the Orchard or null if the Orchard is empty. Initialize the tallest with the first element. ○ contains() determines if a Tree of the given type is in the Orchard. Returns true if a Tree of the given type is in the Orchard. Otherwise false. ○ treeList() gets an ArrayList<String> containing the types of all…
- For the first part of this lab, copy your working ArrayStringList code into the GenericArrayList class.(already in the code) Then, modify the class so that it can store any type someone asks for, instead of only Strings. You shouldn't have to change any of the actual logic in your class to accomplish this, only type declarations (i.e. the types of parameters, return types, etc.) Note: In doing so, you may end up needing to write something like this (where T is a generic type): T[] newData = new T[capacity]; ...and you will find this causes a compiler error. This is because Java dislikes creating new objects of a generic type. In order to get around this error, you can write the line like this instead: T[] new Data = (T[]) new Object[capacity] This creates an array of regular Objects which are then cast to the generic type. It works and it doesn't anger the Java compiler. How amazing! Once you're done, screenshot or save your code for checkin later. For the second part of the lab,…It is time for you to demonstrate your skills in a project of your own choice. You must DESIGN,ANALYSE AND CODE any method for the GENERIC MyLinkedList class that will manipulate the linkedlist. You can decide yourself what it should be following the specification below:1. Purpose: The method must make logical sense – it should be of some purpose to somebody.You should describe in the text who will use the method for which purpose.2. Clearly explain the problem. Then clearly explain how your method will solve it.3. Test program: Test the method using a wrapped class like Integer however, you will get extramarks if you can test it with the new classes you created in I_Do1 and I_Do2.It is time for you to demonstrate your skills in a project of your own choice. You must DESIGN,ANALYSE AND CODE any method for the GENERIC MyLinkedList class that will manipulate the linkedlist. You can decide yourself what it should be following the specification below:1. Purpose: The method must make logical sense – it should be of some purpose to somebody.You should describe in the text who will use the method for which purpose.2. Clearly explain the problem. Then clearly explain how your method will solve it.3. Test program: Test the method using a wrapped class like Integer wrapper class. All of this must be done using generic linked lists, and coded in java.