Generics problem

[ankur.trapasiya]

abstract class ABS<K extends Number>
{
	public abstract <K> K useMe(Object k);// understood ..  
	public abstract <K> ABS<? extends Number> useMe(ABS<? super K> k)	; //1
	public abstract <K> ABS<? super Number> useMe(ABS<? extends K> k); //2
	public abstract <K> ABS<K> useMe(ABS<K> k);// understood ..  
}

1 and 2 this both should not work because K can be anything here....

can anyone please explain???

Thanks in advance....

[doWhile]

Cross posted Generics problem - Java Programming Forums

[Petr]

Hi.
You have methods this a same name useMe.
I changed your code as follows

public abstract class ABS<K extends Number> {
	public abstract <K> K useMe(Object k);

    public abstract <K extends Number> ABS<? extends Number> useMeExtends(ABS<? super K> k);

	public abstract <K> ABS<? super Number> useMeSuper(ABS<? extends K> k);

	public abstract <K extends Number> ABS<K> useMe(ABS<K> k);
}