fork download

copy

/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String[] sources = {"test1", "test2"};
		List<Stream> elem = Media.getList(sources);
	}
}
 
abstract class Media
{
	String url;
 
	protected Media(String source) {
		url = source;
	}
 
	public static <T extends Media> List<T> getList(String[] sources) {
		List<T> newList = new ArrayList<T>();
		for (String source: sources) {
			newList.add(T.getInstance(source));
		}
		return newList;
	}
 
	public static <M extends Media> M getInstance(String source) {
		return null;
	}
}
 
interface Instance {
	abstract public static Media getInstance(String source);
	abstract public static List<Media> getList(String[] sources); 
}
 
class Stream extends Media implements Instance
{
	public Stream(String source) {
		super(source);
	}
 
	public static Stream getInstance(String source) {
		return new Stream(source);
	}
}

Main.java:40: error: modifier static not allowed here
	abstract public static Media getInstance(String source);
	                             ^
Main.java:41: error: modifier static not allowed here
	abstract public static List<Media> getList(String[] sources); 
	                                   ^
Main.java:29: error: no suitable method found for add(Media)
			newList.add(T.getInstance(source));
			       ^
    method List.add(int,T) is not applicable
      (actual and formal argument lists differ in length)
    method List.add(T) is not applicable
      (actual argument Media cannot be converted to T by method invocation conversion)
  where T is a type-variable:
    T extends Media declared in method <T>getList(String[])
Main.java:44: error: Stream is not abstract and does not override abstract method getList(String[]) in Instance
class Stream extends Media implements Instance
^
Main.java:50: error: getInstance(String) in Stream cannot implement getInstance(String) in Instance
	public static Stream getInstance(String source) {
	                     ^
  overriding method is static
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
5 errors

Standard output is empty