Question

Language : JAVA

Part A

Create a class CompanyDoc, representing an official document used by a company. Give it a String title and an int length.

Throughout the class, use the this. notation rather than bare instance variables and method calls.  

Add a default constructor.

Add a parameterized constructor that takes a value for title. Use this( appropriately to call one constructor from another.

Add a toString(), which returns a string with the title, and the length in parentheses. So it might look like:

Employment Turnover Report (16342) 

Add a method longer( with return type boolean, which takes a CompanyDoc as parameter.

doc1.longer(doc2) returns true if doc1's length is greater than doc2's length, false otherwise.

Part B
Create a class Employee with an instance variable for name and instance variable currentDoc of type CompanyDoc.

To CompanyDoc, also add an instance variable author of type Employee.

In Employee, in the mutator for currentDoc, make sure that when a CompanyDoc becomes an employee's currentDoc, the employee becomes the author of the document as well.

In Employee, add a method swapDocs( which takes another Employee and has them swap their currentDocs.

Part C

Create a class DocRepository with one instance variable of type Employee, currentEmployee

Add a method menu that presents a menu-driven interface as follows (you can add as many methods to do this as you like ):

Main menu -- user can either create an employee or end the program

If they create an employee, ask for the name, create an employee with that name (henceforth, the current employee) , and go to Employee Menu. (Do this even if a current employee was created previously; just replace the old one.)

Employee menu -- user can create a document, edit document, view document, or return to the main menu.

If they ask to create a document, what we want to do is ask for the title, create that document, and make it the current employee's current document.  First, however, check whether the current employee already has a current document. If not, just go ahead. If they have one, first ask if they want to replace it, and only do so if they say yes. After this, return to the Employee Menu

If they edit the document, first check if the current employee has a document. If not, complain and return to the Employee menu. If so, go to the Document menu.

If they view the document, simply print the current document.

Document menu -- user can add words, remove words, or return to the Employee menu.

If the user adds words, ask how many, and add that to the length of the current document.

If the user removes words, check that there are at least that many words in the current document. If so, subtract that from the length, otherwise complain and return to the Document menu.

In a separate main, create a DocRepository and have it start its menu.

[EC+15]

In another class with a main SongSwitch in your project, do problem 5.29 from the text (book: Java How to Program (Early Objects)) for printing a cumulative song using loops and switch statements. However, instead of 12 Days of Xmas, do some other similar song, like Old Lady Who Swallowed the Fly, Hole in the Bottom of the Sea, or I Had a Shoggoth (or one you make up yourself).

Answer 1

Answer:

import java.util.Scanner; //imported Scanner class

class CompanyDoc{ //CompanyDoc class implementation.

//instance variables

private String title;

private int length;

private Employee author;

//constructors.

public CompanyDoc(){

this.title = null;

this.length = 0;

}

public CompanyDoc(String title){

this.title = title;

this.length = 0;

}

public CompanyDoc(String title, int length){

this.title = title;

this.length = length;

}

//toString method.

public String toString(){

return this.title+" ("+this.length+")";

}

//longer method.

public boolean longer(CompanyDoc cd){

if(this.length>cd.length)

return true;

return false;

}

//menu method, not implemented as not stated in question.

public void menu(){

}

}

class Employee{//Employee class.

//instance variables.

private String name;

private CompanyDoc currentDoc;

//constructors

public Employee(){

this.name=null;

this.currentDoc=null;

}

public Employee(String name){

this.name = name;

this.currentDoc = null;

}

public Employee(String name, CompanyDoc currentDoc){

this.name = name;

this.currentDoc = currentDoc;

}

//setter for currentDoc

public void setCurrentDoc(CompanyDoc currentDoc){

this.currentDoc = currentDoc;

}

//getter for currentDoc

public CompanyDoc getCurrentDoc(){

return this.currentDoc;

}

//swapDocs method.

public void swapDocs(Employee e){

CompanyDoc cd = e.getCurrentDoc();

e.setCurrentDoc(this.currentDoc);

this.currentDoc = cd;

}

//menu method

public void menu(){

Scanner scanner = new Scanner(System.in);

System.out.print("\n1.create Document\n2.edit Document\n3.view Document\nAny other option to return to main menu\nenter option: ");

int option = scanner.nextInt();

if(option==1){

if(this.getCurrentDoc()!=null){

System.out.print("The current Employee already has a document. Do you want to replace it (yes|no): ");

scanner.nextLine();

String choice = scanner.nextLine();

if(choice.toUpperCase().equals("YES")){

System.out.print("Enter title: ");

String title = scanner.nextLine();

CompanyDoc cd = new CompanyDoc(title);

this.setCurrentDoc(cd);

}

}

else{

System.out.print("Enter title: ");

scanner.nextLine();

String title = scanner.nextLine();

CompanyDoc cd = new CompanyDoc(title);

this.setCurrentDoc(cd);

}

this.menu();

}

else if(option==2){

if(this.getCurrentDoc()!=null){

this.currentDoc.menu();

}

else{

System.out.println("The current Employee has no document");

this.menu();

}

}

else if(option==3){

System.out.println(this.currentDoc);

this.menu();

}

else return;

}

}

class DocRepository{ //DocRepository class which is used as driver class in this program

//instance variable.

private Employee currentEmployee;

//menu method.

public void menu(){

System.out.print("\n1. create Employee\nAny other number to end program\nenter option: ");

}

public static void main(String[] args) { //main method

DocRepository dr = new DocRepository(); //object created for DocRepository class

Scanner scanner = new Scanner(System.in);//object created for Scanner class.

dr.menu();//called menu method of DocRepository class.

int option = scanner.nextInt();

while(option==1){

System.out.print("Enter Employee name: ");

scanner.nextLine();

String name = scanner.nextLine();

dr.currentEmployee = new Employee(name);

dr.currentEmployee.menu();

dr.menu();

option = scanner.nextInt();

}

}

}

//output screenshots