java - interface and a class. name clash: same erasure, yet neither overrides other

Question

I have an interface, and when I try to implement one of its methods, I get this error : "name clash: enqueue(T#1) in GenericQueue and enqueue(T#2) in IGenericQueue have the same erasure, yet neither overrides the other where T#1 ,T#2 are type variables: T#1 extends Comparable declared in class GenericQueue T#2 extends Comparable declared in interface IGenericQueue " here's the code :

public interface IGenericQueue <T extends Comparable> {
public void enqueue(T j);
..
}

public class GenericQueue<T extends Comparable> implements IGenericQueue {
....

public void enqueue(T j) // the error is in this line.
{
    if(rear == maxSize -1)
        rear = -1; // means you have reached the last element start again ?

    queArray[++rear] = j;
    nItems ++ ;
}
}

Answer 1

Your GenericQueue is implementing the raw interface IGenericQueue, so its T is different than the T in IGenericQueue. Add the <T> in the implements clause:

public class GenericQueue<T extends Comparable> implements IGenericQueue<T> {
//                                                                      ^^^

so you are implementing the generic interface with the same T.