ライブラリ用のプログラムを作成しています。ライブラリには、本、ビデオ、ジャーナルなどのさまざまなアイテムが含まれています...
itemライブラリ内のすべてのアイテムの基本的なメソッドで呼び出されるクラスがありbook、、、、および他videoのjournalすべてのアイテムのクラスは拡張されItemます。ライブラリ内のすべてのアイテムを含む配列を作成して、特定のアイテムを検索できるようにしたいと考えています。配列内でそれを見つけて、そのアイテムの情報を表示します。
私が抱えている問題は、型の配列を作成するときにItem、クラスのメソッドしか呼び出せず、クラスまたはクラスでItem作成した新しいメソッドを呼び出すことができないことです。bookbookjournaljournal
そのため、さまざまなタイプのItems. 各アイテムのすべての異なるクラスからメソッドを呼び出すことができる配列を 1 つだけ持つ方法はありますか?
以下の私のコードを見ることができます。配列があるクラスのコードのみを添付しましtesterた。他のクラスのコードを確認する必要がある場合はお知らせください。助けていただければ幸いです。
import java.util.Arrays;
import java.util.Scanner;
public class Library{
static String title;
static String author;
static int id;
static int copies;
static String date;
static Book[] database = new Book[100];
static Video[] database2 = new Video[100];
static Journal[] database3 = new Journal[100];
static CD[] database4 = new CD[100];
static int count=0;
public static void main(String[] args){
int i;
Scanner s = new Scanner(System.in);
do{
System.out.println("type the adjacent number to preform that process.\n1: Add an item\n2: Checkout an item\n0: Exit program");
i=s.nextInt();
switch(i){
case 1:
addItem();
break;
case 2:
break;
}
}while(i != 0);
database[0].viewDetails();
database[1].viewDetails();
checkingOut();
database[0].viewDetails();
database[1].viewDetails();
}
public static void addItem(){
int i;
Scanner s = new Scanner(System.in);
do{
System.out.println("type the adjacent number to add the item.\n1: Book\n2: Video\n3: Journal\n4: CD\n Type 0 to stop");
i=s.nextInt();
switch(i){
case 1:
addBook();
break;
case 2:
addVideo();
break;
case 3:
addJournal();
break;
case 4:
addCD();
break;
}
}while(i != 0);
}
public static void addBook(){
String title;
String author;
int id;
int copies;
String date;
int count=0;
Scanner s = new Scanner(System.in);
System.out.println("Enter the title of the book you want to add to the collection");
title=s.nextLine();
System.out.println("Enter the author of the book you want to add to the collection");
author=s.nextLine();
System.out.println("Enter the publishing date of the book you want to add to the collection");
date=s.nextLine();
System.out.println("Enter the ID number of the book you want to add to the collection");
id=s.nextInt();
System.out.println("Enter the the number of copies that will be added into the collection");
copies=s.nextInt();
Book Book1 = new Book(date, author, copies, id, title);
database[count] = Book1;
count++;
}
public static void addJournal(){
String title;
String author;
int id;
int copies;
String date;
int count=0;
Scanner s = new Scanner(System.in);
System.out.println("Enter the title of the journal you want to add to the collection");
title=s.nextLine();
System.out.println("Enter the author of the journal you want to add to the collection");
author=s.nextLine();
System.out.println("Enter the publishing date of the journal you want to add to the collection");
date=s.nextLine();
System.out.println("Enter the ID number of the journal you want to add to the collection");
id=s.nextInt();
System.out.println("Enter the the number of copies that will be added into the collection");
copies=s.nextInt();
Journal Journal1 = new Journal(date, author, copies, id, title);
database3[count] = Journal1;
count++;
}
public static void addCD(){
String title;
String art;
String genre;
int id;
int copies;
int date;
int count=0;
Scanner s = new Scanner(System.in);
System.out.println("Enter the title of the cd you want to add to the collection");
title=s.nextLine();
System.out.println("Enter the artist of the cd you want to add to the collection");
art=s.nextLine();
System.out.println("Enter the release year of the cd you want to add to the collection");
date=s.nextInt();
System.out.println("Enter the genre of the cd you want to add to the collection");
genre=s.nextLine();
System.out.println("Enter the ID number of the cd you want to add to the collection");
id=s.nextInt();
System.out.println("Enter the the number of copies that will be added into the collection");
copies=s.nextInt();
CD CD1 = new CD(date, copies, id, title, art, genre);
database4[count] = CD1;
count++;
}
public static void addVideo(){
String title;
String director;
int id;
int copies;
int date;
String genre;
int count=0;
Scanner s = new Scanner(System.in);
System.out.println("Enter the title of the video you want to add to the collection");
title=s.nextLine();
System.out.println("Enter the director of the cd you want to add to the collection");
director=s.nextLine();
System.out.println("Enter the release year of the cd you want to add to the collection");
date=s.nextInt();
System.out.println("Enter the genre of the video you want to add to the collection");
genre=s.nextLine();
System.out.println("Enter the ID number of the video you want to add to the collection");
id=s.nextInt();
System.out.println("Enter the the number of copies that will be added into the collection");
copies=s.nextInt();
Video Video1 = new Video(date, copies, id, title, director, genre);
database2[count] = Video1;
count++;
}
public static void checkingOut(){
boolean found=false;
int idSearch;
int i=0;
Scanner s=new Scanner(System.in);
System.out.println("Enter the ID number of the book you want to check out");
idSearch=s.nextInt();
while(i<database.length && found!=true){
if(database[i].getIdentificationNumber() == idSearch){
found = true;
break;
}
i++;
}
if(found==true){
database[i].checkOut();
System.out.println("There are "+database[i].getNumberCopies()+" copies left");
}
else{System.out.println("There is no book with that ID number!");}
}
}