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- You may have found it somewhat tedious and unpleasant to use the debugger and visualizer to verify the correctness of your addFirst and addLast methods. There is also the problem that such manual verification becomes stale as soon as you change your code. Imagine that you made some minor but uncertain change to addLast]. To verify that you didn't break anything you'd have to go back and do that whole process again. Yuck. What we really want are some automated tests. But unfortunately there's no easy way to verify correctness of addFirst and addLast] if those are the only two methods we've implemented. That is, there's currently no way to iterate over our list and get bad its values and see that they are correct. That's where the toList method comes in. When called, this method returns a List representation of the Deque. For example, if the Deque has had addLast (5) addLast (9) addLast (10), then addFirst (3) called on it, then the result of toList() should be a List with 3 at the…Scrabble Help: The file dictionary.txt contains all of the words in the Official Scrabble Player's Dictionary, Second Edition. Note: this list contains some offensive language. Write a class, WordLists, in Java that generates useful word lists for scrabble players using this list. Your class should contain the following methods: WordLists(String fileName): a constructor that takes the name of the dictionary file as the only parameter. lengthN(int n): returns an ArrayList of all length n words (Strings) in the dictionary file. endsWith(char lastLetter, int n): returns an ArrayList of words of length n ending with the letter lastLetter containsLetter(char included, int index, int n): returns an ArrayList of words of length n containing the letter included at position index. So for example the word "cannon" would be on the list returned by containsLetter('o',6,4) because it contains the letter 'o', at index 4, and is length 6. multiLetter(int m, char included): returns an ArrayList of…createDatabaseOfProfiles(String filename) This method creates and populates the database array with the profiles from the input file (profile.txt) filename parameter. Each profile includes a persons' name and two DNA sequences. 1. Reads the number of profiles from the input file AND create the database array to hold that number profiles. 2. Reads the profiles from the input file. 3. For each person in the file 1. creates a Profile object with the information from file (see input file format below). 2. insert the newly created profile into the next position in the database array (instance variable).
- A file USPopulation.txt contains the population of the US starting in year 1950 and then each subsequent record has the population for the following year. USPopulation.txtDownload USPopulation.txt Write a program that uses an array with the file that displays these in a menu and then produces the results. This is not an Object Oriented Program but should be a procedural program, calling methods to do the following: 1: Displays the year and the population during that year 2. The average population during that time period (Add up the populations of all records and divide by the number of years). 3. The year with the greatest increase in population - print the year and that population and that amount. To figure this out, compare the difference in population before of say year 1950 and 1951, store that difference somewhere. Compare 1951 with 1952, find that difference. Is that difference greater than the stored difference? If so, move that the the maximum place. 4.…in java #6 - program that reads the name data from the files named firstNames.txt and lastNames.txtand produces a list of 1000 random names randomPeople.txtone complete name (firstname lastname) per lineHomework 3: Create Array List with the following: 1. Name : Cars from type String. 2. Add these elements to the array List: BMW, Toyota, Lexus, Broche. 3. Write statement to check if Honda in the list or not. 4. Write statement to return the size of the list.
- Exception handling allows for the programmer to account for incidences that can go wrong at run time and not crash the program. True False The Val function converts a string argument to a numeric value. True False Objects must be self contained and communicate with the host application only through its interface. True False To insure that previously assigned values are not lost when an array is re-dimensioned, you should use the Preserve keyword. True False Message boxes are the most common way for an object to return information to the developer. True False It is not possible to have more than one array in any given form. True False A loop counter can be decremented by starting at the highest value and using a negative Step value True False Tables within datasets hold returned data from SQL. True False Code execution begins at the top of the loop clause and then repeats the body of the loop until a predetermined condition is met. True False A module contains code and variable…ReadInstructor. The class will: – Create an array of instructor objects – Read the instructors.txt file – Create an Instructor object for each line of input and store the object in the array. – After closing the file, it will print out a line for each instructor in the array. Input file:Mary Smith 1991 50000.00 John Jones 2000 90000.00 Terry Seidel 1992 51000.00 Jessica Terrell 2000 91000.00Part 5. Operator Overload: add Next, you will add the ability to use the addition operator (+) in conjunction with Simpy objects and floats. You will implement add such that the left-hand side operand of an addition expression can be either a simpy object or a float value using a Union type. The add_method should return a new Simpy object and should not mutate the object the method is called on. When the right-hand side of an addition expression is also a simpy object, you should assert that both objects' values attributes have equal lengths. Then, you should produce a new simpy object where each item in its values attribute corresponds to the items of the original Simpy objects at the same index added together. For example: a = Simpy([1.0, 1.0, 1.0]) b = Simpy([2.0, 3.0, 4.0]) c = a + b print(c) # Output: Simpy([3.0, 4.0, 5.0]) When the right-hand side of an addition expression is a float value, you should produce a new simpy object where each item corresponds to the item at the same…
- JAVA PROGRAM Chapter 7. PC #16. 2D Array Operations with Additional Requirements Write a program that creates an ArrayList of ArrayList of Doubles. The program should ask the user to enter the filename from the keyboard and validate the file for existence. Once the file is verified, the program should load the two-dimensional ArrayList with test data from the file. Be careful, as some of the files will contain rows with different number of elements. The program should work regardless whether the input data is perfectly rectangular or ragged. The program should have the following methods: • main. Main entry point for the program. • getRowSubtotal. This method should accept a two-dimensional ArrayList as its first argument and an integer as its second argument. The second argument should be the index of the row in the ArrayList. The method should return the subtotal of the values in the specified row. • getColSubtotal. This method should accept a two-dimensional ArrayList as its…Complete the method “readdata”. In this method you are to read in at least 10 sets of student data into a linked list. The data to read in is: student id number, name, major (CIS or Math) and student GPA. You will enter data of your choice. You will need a loop to continue entering data until the user wishes to stop. Complete the method “printdata”. In this method, you are to print all of the data that was entered into the linked list in the method readdata. Complete the method “printstats”. In this method, you are to search the linked list and print the following: List of student’s id and names who are CIS majors List of student’s id and names who are Math majors List of student’s names along with their gpa who are honor students (gpa 3.5 or greater) All information for the CIS student with the highest gpa (you may assume that different gpa values have been entered for all students) CODE (student_list.java) You MUST use this code: package student_list;import…Select all of the applicable choices. In which of the following situations is a vector more efficient than a list? O A program that needs to add a significant number of items to the container's beginning O A program that often accesses elements throughout the container O A program that adds a certain amount of elements and then repeatedly removes the initial element O A program that adds elements regularly, but only to the container's end
