创建通用列表

Question

public class Sortieralgorithmen<T extends Comparable <T>>
{
    public static void main (String[] args) throws IOException
    {
         UserInput read = new UserInput();
         ArrayList<Integer> list = read.type(muster, type, length, rounds);
         ArrayList<T> list = read.type(muster, type, length, rounds);
    }
 }

Why is the first working and the second is not?

type is a method in the class UserInput . There I will fill the Array.

Answer 1

Your class has a type parameter T , but your main is a static method.

Just like non-static fields the type parameter T is only accessible in non-static methods (as there is no instance to "take" the type T from in static methods).