How can I make an interface instance method accept arguments of the same class only?

Question

I want to use an interface like this :

public interface ResultItem {
    public int getConfidence();
    public boolean equals(ResultItem item);
    public R         


        

Answer 1

There is a frequently-seen idiom that goes as follows:

public interface ResultItem> {
    public int getConfidence();
    public boolean equals(T item);
    public T cloneWithConfidence(int newConfidence);
}

public class IntResult implements ResultItem {
  //...
}