Thread: Design a class that acts as a library for the following kinds of media: book, video, and newspaper

import java.util.ArrayList;

/*
* example of using Generics
*/

public class Library<T> {

private ArrayList<T> mediaCollection = new ArrayList<T>();

public Library() {
Book b = new Book();
storeMedia(b);
Video v = new Video();
storeMedia(v);
Newspaper n = new Newspaper();
storeMedia(n);
showMedia();
}

public void showMedia() {
System.out.println("These items are in the media collection:");
for (Object resource : mediaCollection.toArray()) {
System.out.print("\t" + resource.toString() + "\n");
}
}

public void storeMedia(T item) {
mediaCollection.add(item);
}

public class Book implements Media {

String type = "book";
String name = "Robinson Curuso";

public Book(){
System.out.println(this.getClass());
}

public String toString() {
return "type is " + type + ", name is: " + name;
}
}

class Video implements Media {

String type = "video";
String name = "Elvis Pressley in the Army";

public String toString() {
return "type is " + type + ", name is: " + name;
}
}

class Newspaper {

String type = "newspaper";
String name = "News & Disturber";

public String toString() {
return "type is " + type + ", name is: " + name;
}
}

interface Media {
// String type;
}

public static void main(String[] args) {
Library<Media> lib = new Library<Media>();
}

}

--- Update ---

Current error is on line 13 the "storeMedia(b);" and other two similar lines. Error message, "method storeMedia in class Library<T> cannot be applied to given types, required T, found Library<T>.Book.

I have made many attempts trying to get clean compile. I think I am missing a basic concept so an explanation along with the code remedy would be appreciated. Thanks in advance

Originally Posted by vbala2k5

import java.util.ArrayList;

/*
* example of using Generics
*/

public class Library<T> {

private ArrayList<T> mediaCollection = new ArrayList<T>();

public Library() {
Book b = new Book();
storeMedia(b);
Video v = new Video();
storeMedia(v);
Newspaper n = new Newspaper();
storeMedia(n);
showMedia();
}

public void showMedia() {
System.out.println("These items are in the media collection:");
for (Object resource : mediaCollection.toArray()) {
System.out.print("\t" + resource.toString() + "\n");
}
}

public void storeMedia(T item) {
mediaCollection.add(item);
}

public class Book implements Media {

String type = "book";
String name = "Robinson Curuso";

public Book(){
System.out.println(this.getClass());
}

public String toString() {
return "type is " + type + ", name is: " + name;
}
}

class Video implements Media {

String type = "video";
String name = "Elvis Pressley in the Army";

public String toString() {
return "type is " + type + ", name is: " + name;
}
}

class Newspaper {

String type = "newspaper";
String name = "News & Disturber";

public String toString() {
return "type is " + type + ", name is: " + name;
}
}

interface Media {
// String type;
}

public static void main(String[] args) {
Library<Media> lib = new Library<Media>();
}

}