1) Write a class on BlueJ, which must be called BookClub. The class must have exactly three fields: two integer fields called capacity and occupancy and one String field called name. The capacity field will store the maximum number of shoppers allowed and occupancy will store the current number of shoppers. (There must be no additional fields defined in the class, even if you think more are required. Consider using local variables inside methods if you think you need extra fields.) The initial values of the book club name, and capacity must be received as parameters to the class's constructor, while the occupancy must always be set to zero when a BookClub object is created. The class must define getter methods for all of the fields. These must be called getName, getCapacity and getOccupancy. You must not call them anything different. You must not write setter methods for the fields. The class must define a method called addOne that takes no parameters. If the current number of shoppers is less than the club's capacity then the occupancy must be increased by 1, which means that a new person has been allowed to enter the club. Otherwise, the following message must be printed and the current number of shoppers must not be changed: The club is full. 2) write if the current number of shoppers is greater than or equal to the number leaving then the number of shoppers is decreased by the number leaving. Otherwise, the following error message must be printed and the number of shoppers present must be set to 0. There is an error in the number of shoppers. Use System.out.println to print the message. The class must define a method called leaving that takes a single integer parameter. This represents the number of shoppers leaving the club at a particular point. You may assume that the parameter's value will always be greater than zero and you do not have to check for that. If the current number of clubbers is greater than or equal to the number leaving then the number of shoppers is decreased by the number leaving. Otherwise, the following error message must be printed and the number of clubbers present must be set to 0. There is an error in the number of shoppers. Use System.out.println to print the error message. The class must define a method called is Space that allows the book club staff to determine whether there is enough capacity for a group to attend. This method must take a single integer parameter representing the size of the group, and return a boolean result. The method must work as follows: If the value of the parameter is less-than or equal-to then the method must return false. This case has priority over those following. If the value of the parameter is less-than or equal-to the space left in the book club (use the capacity and occupancy values in the to work this out) then the method must return true. Otherwise (i.e., if there is not space in the book club for the whole group) then the method must return false. (Note that the method must only return true if there is space for the whole group to attend. This method must not change the state of the BookClub object. In other words, both the current number of occupants and the capacity of the club must be exactly the same after it is called as it was before.) 3) The class must define a method called isSpace that allows the book club staff to determine whether there is enough capacity for a group to attend. This method must take a single integer parameter representing the size of the group, and return a boolean result. The method must work as follows: If the value of the parameter is less-than or equal-to then the method must return false. This case has priority over those following. If the value of the parameter is less-than or equal-to the space left in the book club (use the capacity and occupancy values in the to work this out) then the method must return true. Otherwise (i.e., if there is not space in the book club for the whole group) then the method must return false. This method must not change the state of the BookClub object. In other words, both the current number of occupants and the capacity of the club must be exactly the same after it is called as it was before (Note that the return type of this method must be boolean. The method has to return either true or false and that does not mean that it should print or return the strings "true" or "false). The class must define a method called printDetails that prints the current details (using System.out.println) of the book club in the following format: The Venue: 50 shoppers. Capacity 150. Where "The Venue" is the book club's name; 50 shoppers are currently present and the club's capacity is 150. Of course, different BookClub objects will have different names, number of clubbers and different capacities. (Take note of the spacing between the different parts, the punctuation, and the order of the things to be printed) Write a method called about that has a void return type and takes no parameter. When called, this must print: BookClub written by login where you must replace login with for instance: BookClub written by djb247