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JAVA

Task 1 The package resturant contains the class Task1 with the main method public static void main(String [] args) { Diner.createParty For (args); Diner.list All TheDiners(); } but the two methods it calls currently have empty bodies and you must change them to make it work. You will notice Taski expects to take values from the args parameter (see Exercise1G). These values are the names of the diners. The method createPartyFor() should use them to create and populate a static ar- ray in Diner called allTheDiners by creating a new Diner object for each name supplied with the correct value for its instance variable theDinersName. The second method call in Taski, listAllTheDiners(), should print out "The din- ers are on the first line followed by the names of the diners one to a line ending with a blank line. A static EasyWriter object called screen has already been declared in the class Diner which you must use to do display this information. To do this successfully you must fill in the bodies of three methods in Diner; the constructor, createPartyFor() and listAllTheDiners (). You may not change anything outside the bodies of these three methods. So a successful run of Taskl could look like this ... >java resturant/Task1 Harry Hermione Ron The diners are Harry Hermione Ron If you do this correctly with a perfectly written program you will get 40% Task 2 Task2's main method public static void main (String [] args) { Diner.create Party For (args); Diner. takeEveryonesOrder(); Diner.listEveryonesOrder(); starts like Taskl but now you need to find what everyone is ordering and then display it. The first method call createPartyFor() is already written. You now need to fill in the bodies of two more methods in Diner and some other methods as well. The method takeEveryonesrder() should go through all the diners in turn to ask for their order by asking them to choose an item and go on asking them to choose items until they don't want anything else. It should then move on the the next diner. Diner already has an instance variable Order [] thingsOrderedByDiner; to store the things the diner orders. An incomplete version of the class Order has been provided as part of the package. An ArrayList, rather than an array, would have been better for thingsOrderedByDiner but we will be using an array for practice so you should not change this line. This variable needs a value assigned to it in the constructor for Diner and then each item ordered can be added to it up to a maximum defined by the constant static final int MAX_NUMBER_OF_THINGS_A_DINER_CAN_ORDER-10; which has also already been declared. So takeEveryonesOrder() should fill in the thingsOrderedByDiner ar- ray by calling the instance method askFor Their Order() for each diner and askFor Their Order() in turn should call a method called askFor New ThingOrdered) in the class Order. askForANewThingOrdered) asks if the item ordered is a Starter, Main, Side, Pudding or Drink and how much the item costs using an EasyReader object called keyboard already declared for you. There is an enum for Starter, Main, Side, Pudding and Drink called MenuItem which has also al- ready been declared and it has a method called Called which takes a String as a parameter and returns either the appropriate MenuItem or null if it can't guess what the parameter is meant to be. It will accept any identifiable shorthand for the menu item and is not case sensitive. You have no need to change it. If the item ordered is not identifiable askFor NewThingOrdered() must return mull otherwise it asks the price and returns an Order object. Finally you need to write the last method in Task2 listEveryonesOrder 0. This does what the name says but there is a useful toString method in Order which you can use to get a tidy output. You don't need to do anything with it except use it So for Task 2 you need to fill in the bodies of five methods; takeEveryonesOrder() askFor Theirrder() and listEveryonesOrder() in Diner and askFor Alle ThingOrdered and the constructor in Order. You will need to make a small change to the con- structor for Diner too but should change nothing else. A successful run of Task2 could look like this ... >java resturant/Task 2 Harry Ron Hermione Time for Harry to order What do you want? (starter, main, pudding, side, drink or nothing) starter What is the starter's price? 7.50 What do you want? (starter, main, pudding, side, drink or nothing) nain What is the main's price? 15 What do you want? (starter, main, pudding, side, drink or nothing) nothing else Time for Ron to order What do you want? (starter, main, pudding, side, drink or nothing) side What is the side's price? 3.50 What do you want? (starter, main, pudding, side, drink or nothing) drink What is the drink's price? 5.50 What do you want? (starter, main, pudding, side, drink or nothing) pudding What is the pudding 's price? 6.75 What do you want? (starter, main, pudding, side, drink or nothing) nothing Time for Hermione to order What do you want? (starter, main, pudding, side, drink or nothing) drink What is the drink's price? 7.50 What do you want? (starter, main, pudding, side, drink or nothing) nothing The diners' order is Harry Starter 7.50 Main 15.00 Ron Side 3.50 Drink 5.50 Pudding 6.75 Hermione Drink 7.50 although the items ordered could have been abbreviated to just their initial letters except for starter and side which need the first two letters and nothing could equally well have been "That's all" because anything not identifiable as a starter, main, pudding, side or drink is treated as the end of the list. If you do this correctly with a perfectly written program you will get another 30% so 70% in total. Task 3 Task3's main method public static void main (String [] args) { Diner.create Party For (args); Diner.takeEveryones Order(); Diner.listEveryonesOrder(); Diner.dealWith TheBill(); is the same as Task 2 except it has one extra line, the call to the method deal WithTheBill in Diner. deal WithTheBill should work out how much the whole party owes and then list their individual contributions on the basis that they will pay whatever they owe rounded up to the nearest whole pound (see Math.ceilo). Finally it should say how much they would overpay by that method. All output should use the Easy Writer variable screen already declared. So the first line output should be "The diners owe " followed by the amount to two decimal places displayed using the methods of screen variable. On the next line it should say "Everyone's debt rounded up is" and then, on subsequent lines, the individual rounded up debts one to a line name first with no decimal places and finally the last line should be "which is too much by followed, on the same line by the amount to two decimal places using screen again. A successful run of Task3 could look like this ...>java resturant/Task3 Harry Ron Hermione Time for Harry to order What do you want? (starter, main, pudding, side, drink or nothing) st What is the starter's price? 7.5 What do you want? (starter, main, pudding, side, drink or nothing) m What is the main's price? 15 What do you want? (starter, main, pudding, side, drink or nothing) x Time for Ron to order What do you want? (starter, main, pudding, side, drink or nothing) si What is the side's price? 3.5 What do you want? (starter, main, pudding, side, drink or nothing) a What is the drink's price? 5.5 What do you want? (starter, main, pudding, side, drink or nothing) P What is the pudding's price? 6.75 What do you want? (starter, main, pudding, side, drink or nothing) n Time for Hermione to order What do you want? (starter, main, pudding, side, drink or nothing) d What is the drink's price? 7.5 What do you want? (starter, nain, pudding, side, drink or nothing) nothing thank you The diners' order is Harry Starter 7.50 Main 15.00 Ron Side 3.50 Drink 5.50 Pudding 6.75 Hermione Drink 7.50 The diners owe 45.75 Everyone's debt rounded up is Harry 23 Ron 16 Hermione a which is too much by 1.25 If you do this correctly with a perfectly written program you will get another 15% So 85% in total. Task 4 Task 4 considers the possibility that everyone may not order everything in one go. Its main method is public static void main (String [] args) { Diner.createParty For (args); Diner. takeEveryones Order(); Diner.list Everyones Order(); Diner.getAnother Round(); Diner.list Everyones Order(); } It includes a new method call get Another Round which allows the diners to order one new item each. It does this by a call to another new method in Orders also called ask For A New Thing Ordered but this version takes, as a parameter, a String, the name of the diner being asked about extras. So each diner is asked "What else do you want...?" where ... is replaced by the diner's name. And second time around there is no need to list the items available. So a successful run of Task3 could look like this ... >java resturant/Task4 Harry Ron Hermione Time for Harry to order What do you want? (starter, sain, pudding, side, drink or nothing) st What is the starter's price? 8.56 What do you want? (starter, main, pudding. side, drink or nothing) = What is the main's price? 15 What do you want? (starter, main, pudding. side, drink or nothing) d What is the drink's price? 4 What do you want? (starter, main, pudding. side, drink or nothing) Time for Ron to order What do you want? (starter, main, pudding. side, drink or nothing) si What is the side's price? 4 What do you want? (starter, main, pudding. side, drink or nothing) d What is the drink's price? 5.9 What do you want? (starter, main, pudding. side, drink or nothing) x Time for Hermione to order What do you want? (starter, main, pudding. side, drink or nothing) d What is the drink's price? 9.50 What do you want? (starter, main, pudding, side, drink or nothing) nothing The diners' order is Harry Starter 8.56 Main 15.00 Drink 4.00 Ron Side 4.00 Drink 5.90 Hermione Drink 9.50 What else do you want Harry? d What is the drink's price? 12 What else do you want Ron? m What is the main's price? 13.45 What else do you want Hermione? st What is the starter's price? 8.23 The diners' order is Harry Starter 8.56 Main 15.00 Drink 4.00 Drink 12.00 Ron Side Drink Main Hermione Drink Starter 4.00 5.90 13.45 9.50 8.23