حل بروجكت cpcs203

[SPIDER]

MyDatabse Class using Arrays

import java.util.InputMismatchException;
import java.util.Scanner;

public class MyDatabase
{
	private static Scanner input = new Scanner(System.in);
	private int CDs;
	private int DVDs;
	private CD[] CD_Collection;
	private DVD[] DVD_Collection;
	private char choice;
	
	public MyDatabase()
	{
		System.out.println("The rental system program has begun.");
		System.out.println();
		System.out.println("~=(Getting information from the shop’s employer)=~");
		System.out.println();
		askUser();
		do
        {
			System.out.println();
			System.out.println("~=(Main Menu)=~");
            printMenu();
            choice = input.nextLine().toUpperCase().charAt(0);
            System.out.println();
            switch (choice)
            {
                case 'A':
                	      System.out.print("Insert the title name you are looking for: ");
                		  String CD_title = input.nextLine();
                		  int CD_title_index = -1;
                		  for(int i = 0; i < CDs; i++)
                		  {
                			  if(CD_Collection[i].getTitle().equals(CD_title))
                			  {
                				  CD_title_index = i;
                				  break;
                			  }
                		  }
                		  if(CD_title_index == -1) System.out.println("no matched title.");
                		  else
                		  {
                			  System.out.println("The title name matches the following CD's title name:");
                			  System.out.println(CD_Collection[CD_title_index].toString());
                		  }
                break;
                
                case 'B':
                	      System.out.print("Insert the artist name you are looking for: ");
                	      String artist = input.nextLine();
                	      int artist_index = -1;
                	      for(int i = 0; i < CDs; i++)
                	      {
                	    	  if(CD_Collection[i].getArtist().equals(artist))
                	    	  {
                	    		  artist_index = i;
                	    		  break;
                	    	  }
                	      }
                	      if(artist_index == -1) System.out.println("no matched artist.");
                	      else
                	      {
                	    	  System.out.println("The artist name matches the following CD's artist name:");
                	    	  System.out.println(CD_Collection[artist_index].toString());
                	      }
                break;
                
                case 'C':
                	      System.out.print("Insert the title name you are looking for: ");
                	      String DVD_title = input.nextLine();
                	      int DVD_title_index = -1;
                	      for(int i = 0; i < DVDs; i++)
                	      {
                	    	  if(DVD_Collection[i].getTitle().equals(DVD_title))
                	    	  {
                	    		  DVD_title_index = i;
                	    		  break;
                	    	  }
                	      }
                	      if(DVD_title_index == -1) System.out.println("no matched title.");
                	      else
                	      {
                	    	  System.out.println("The title name matches the following DVD's title name:");
                	    	  System.out.println(DVD_Collection[DVD_title_index].toString());
                	      }
          	    break;
          	              
                case 'D':
                	      System.out.print("Insert the director name you are looking for: ");
                	      String director = input.nextLine();
                	      int director_index = -1;
                	      for(int i = 0; i < DVDs; i++)
                	      {
                	    	  if(DVD_Collection[i].getDirector().equals(director))
                	    	  {
                	    		  director_index = i;
                	    		  break;
                	    	  }
                	      }
                	      if(director_index == -1) System.out.println("no matched director.");
                	      else
                	      {
                	    	  System.out.println("The director name matches the following DVD's director name:");
                	    	  System.out.println(DVD_Collection[director_index].toString());
                	      }
                break;
                
                case 'P': System.out.println("The shop has " +
                		  (CDs == 0? "no CDs":CDs == 1? "only one CD":CDs + " CDs") +
						  " and " + 
						  (DVDs == 0? "no DVDs":DVDs == 1? "only one DVD":DVDs + " DVDs")
						  + ".");
                		  System.out.println();
                		  System.out.println(".:CDs Details:.");
                		  for(int i = 1; i <= CDs; i++)
                		  {
                			  System.out.println("CD#" + i + ":");
                			  System.out.println(CD_Collection[i-1].toString());
                		  }
                		  System.out.println();
                		  System.out.println(".:DVDs Details:.");
                		  for(int j = 1; j <= DVDs; j++)
                		  {
                			  System.out.println("DVD#" + j + ":");
                			  System.out.println(DVD_Collection[j-1].toString());
                		  }
                break;
                
                case 'R':
                		  int rented_CDs = 0;
                		  int rented_DVDs = 0;
                		  for(int i = 1; i <= CDs; i++)
                		  {
                			  if(CD_Collection[i-1].getRented()) rented_CDs++;
                		  }
                		  for(int j = 1; j <= DVDs; j++)
                		  {
                			  if(CD_Collection[j-1].getRented()) rented_DVDs++;
                		  }
                		  System.out.println("The shop has " +
                  		  (rented_CDs == 0? "no rented CDs":rented_CDs == 1? "only one rented CD":rented_CDs + " rented CDs") +
  						  " and " + 
  						  (rented_DVDs == 0? "no rented DVDs":rented_DVDs == 1? "only one rented DVD":rented_DVDs + " rented DVDs")
  						  + ".");
                		  System.out.println();
                  		  System.out.println(".:Rented CDs Details:.");
                  		  int rented_CD_index = 1;
                  		  for(CD myCD : CD_Collection)
                  		  {
                  			  if(myCD.getRented())
                  			  {
                  				  System.out.println("CD#" + rented_CD_index + ":");
                  				  System.out.println(CD_Collection[rented_CD_index-1].toString());
                  				  rented_CD_index++;
                  			  }
                  		  }
                  		  System.out.println();
                  		  System.out.println(".:Rented DVDs Details:.");
                  		  int rented_DVD_index = 1;
                		  for(DVD myDVD : DVD_Collection)
                		  {
                			  if(myDVD.getRented())
                			  {
                				  System.out.println("DVD#" + rented_DVD_index + ":");
                				  System.out.println(DVD_Collection[rented_DVD_index-1].toString());
                				  rented_DVD_index++;
                			  }
                		  }
                break;
                
                case 'Q': System.out.println("The program has been closed.");
                break;
                
                default:  System.out.println(choice + " is invalid choice.");
            }
        }
        while (choice != 'Q');
	}
	
	private void printMenu()
	{
		System.out.println();
        System.out.println("The following choices are available: ");
        System.out.println(" A   Search for a specific CD by a title name.");
        System.out.println(" B   Search for a specific CD by an artist name.");
        System.out.println(" C   Search for a specific DVD by a title name.");
        System.out.println(" D   Search for a specific DVD by a director name.");
        System.out.println(" P   Print a report about all CDs and DVDs available.");
        System.out.println(" R   Print a report about all rented CDs and DVDs available.");
        System.out.println(" Q   Exit the program.");
        System.out.print("Insert your choice: ");
	}
	private void askUser()
	{
		CDs = getUserInteger("How many CDs the shop has? ");
		DVDs = getUserInteger("How many DVDs the shop has? ");
		CD_Collection = new CD[CDs];
		DVD_Collection = new DVD[DVDs];
		System.out.println();
		System.out.println("The shop has " +
						  (CDs == 0? "no CDs":CDs == 1? "only one CD":CDs + " CDs") +
						   " and " + 
						   (DVDs == 0? "no DVDs":DVDs == 1? "only one DVD":DVDs + " DVDs")
						   + ".");
		if(CDs > 0)
		{
			System.out.println();
			System.out.print("Insert CD data:" + "\n");
		}
		for(int i = 1; i <= CDs; i++)
		{
			System.out.println("CD#" + i);
			System.out.print("Title: ");
			String title = input.nextLine();
			System.out.print("Artist: ");
			String artist = input.nextLine();
			boolean rented = getUserYesNo("Is it rented?(Yes/No) ");
			System.out.print("Comment: ");
			String comment = input.nextLine();
			CD_Collection[i-1] = new CD(title, artist, rented, comment);
		}
		if(DVDs > 0)
		{
			System.out.println();
			System.out.println("Insert DVD data:");
		}
		for(int j = 1; j <= DVDs; j++)
		{
			System.out.println("DVD#" + j);
			System.out.print("Title: ");
			String title = input.nextLine();
			System.out.print("Director: ");
			String director = input.nextLine();
			boolean rented = getUserYesNo("Is it rented?(Yes/No) ");
			System.out.print("Comment: ");
			String comment = input.nextLine();
			DVD_Collection[j-1] = new DVD(title, director, rented, comment);
		}
	}
	private boolean getUserYesNo(String question)
	{
		String result;
		
		while(true)
		{
			System.out.print(question);
			result = input.nextLine();
			if(result.equalsIgnoreCase("Yes") || result.equalsIgnoreCase("No"))
			{
				break;
			}
			System.out.println("Wrong input! You can only insert \"Yes\" or \"No\"");
		}
		return result.equalsIgnoreCase("Yes");
	}
	private int getUserInteger(String question)
	{
		int result;
		while(true)
		{
			System.out.print(question);
			try
			{
				result = input.nextInt();
				if(result < 0)
				{
					System.out.println("Wrong input! You can only insert positive integer numbers");
					input.nextLine(); // discard \n
					continue;
				}
				input.nextLine(); // discard \n
				break;
			}
			catch(InputMismatchException ex)
			{
				System.out.println("Wrong input! You can only insert positive integer numbers");
				input.next(); // discard non-integer input
			}
		}
		return result;
	}
}