Java: Method signature -

i want make interface mergeable declares method merge(). class implements have implement method follows:

someobject.java

public class someobject implements mergeable      @override     public someobject merge(someobject other) {...} 

see return , parameter type set implementing class. there way enforce , how set method signature in interface?

look @ comparable interface example. you'll have write like

interface mergeable<t> {    t merge(t other); } 

...and anytime want accept mergeable, write

<t extends mergeable<t>> void somethingwithmergeables(t merge1) {    ... }