Thread: generic class

I want to make a generic list class for, let's say, storing a graph. For each node (raging from 1 to n) I keep a linked list for it's neighbors. But I don't want to make an array of lists. I want to use the generic class for making a linked list of linked lists. Roughly speaking, I want to obtain something like this: myList< myList<Integer> > Graph. How can I do it?

I will post a part of the code, to be more precise:

class Node<T>{
	T key;
	Node<T> prevNode, nextNode;
 
	Node(T val) {
		key = val;
	}
}
 
class List<T extends Comparable<T>> {
	Node<T> FirstNode, LastNode;
 
        void insert(T val) { ... }
        void write() { ... }
}
 
class myMain {
	public static void main(String arg[]) {
 
          List< something > Graph = new List< something >();
          .... 
} }

Thank you for your help.

    final List<List<Integer>> someList = new ArrayList<List<Integer>>();

Something like that, you can easily have a list of lists

// Json

Do you mean

    final ArrayList<List<Integer>> someList = new ArrayList<List<Integer>>();

?

When I write as you said to, I get this error: type parameter List<java.lang.Integer> is not within it's bounds.

No I mean.

        final List<List<Integer>> someList = new ArrayList<List<Integer>>();
        someList.add(new ArrayList<Integer>());

That works just fine for me

// Json

Now it works. Thank you.