类型X中的方法X不适用于参数（int）

Question

I am getting the following error when trying to call a method of a generic class with int argument.

The method insertAfter(T) in the type CDLList<T>.Writer is not applicable for the arguments (int)

The Generic class code is

public class CDLList<T> {
public Element Head;
static int count;
public CDLList(T v)
{
    Head = new Element(v);
}
public class Element 
{
    public T data;
    public Element next;
    public Element prev;

    Element(T v)
    {
        data = v;
        prev=null;
        next=null;
        count++;
    }
    public T value() 
    {
        return data;
    }
}
public Element head() 
{
    return Head;
}
public Cursor reader(Element from) 
{
    Cursor CurrCursor=new Cursor(from);
    return CurrCursor;
}
public class Cursor 
{
    public Element current;
    Cursor(Element v)
    {
        current=v;
    }
    public Element current() 
    {
        T temp;
        temp = current.value();
        System.out.println(temp);
        return current;
    }
    public void previous() 
    {
        current = current.prev;
    }
    public void next()
    {
        current = current.next;
    }
    public Writer writer()
    {
        Writer nwriter = new Writer( current);

        return nwriter;

    }
}



public class Writer
{
    public Element current;
    Writer(Element temp)
    {
        current=temp;
    }
    public boolean delete()
    {
        Element Td1,Td2;
        Td1 = current.prev;
        Td2 = current.next;
        current=null;
        Td1.next = Td2;
        Td2.prev = Td1;
        return true;

    }
    public boolean insertBefore(T val)
    {

        Element t = new Element(val);
        Element t2 = current.prev;
        t2.next=t;
        current.prev=t;
        t.next=current;
        t.prev=t2;      
        return true;
    }
    public boolean insertAfter(T val)
    {
        Element t = new Element(val);
        Element t1 = current.next;
        t.next=t1;
        t1.prev=t;
        current.next=t;
        t.prev=current;
        return true;

    }
}

}

The class implementing the generic class is

    public class CDLListTest<T> extends CDLList<T> implements Runnable {
Cursor cursor;

public CDLListTest(T v) {
    super(v);
    // TODO Auto-generated constructor stub
            Element t1= new CDLList.Element(20); 
            -----------------------
    temp.writer().insertAfter(11); -- Getting error here 

It works if I extend the generic class to another child generic class and extend the child generic class to a class which contains the main function.

What am I missing here? It should work since the class is generic, After googling a lot unable to find any answers

Edit: I'm sorry I was quite burned out yesterday when I was posting this question, my apologies. I have edited the question to make it clearer.

Edit2: Fixed it public class CDLListTest<T> extends CDLList<T> should have been public class CDLListTest<T> extends CDLList

Answer 1

It looks like you've written a method called insertAfter(T value) (which you haven't shown us). Now, you're referring to it when you're dealing with a CDLListTest<T> - in which T could be any class or interface at all. Therefore, when you call insertAfter , the value you pass it must be a T . But you're passing it an int instead of a T .

Either change your call to insertAfter to pass a T , or change the signature of the insertAfter method so that its parameter is of type int .