java - How to implement interface that uses templates? -

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i'm expected implement immutable list interface looks this:

public interface interflist<t> extends iterable<t> {     public interflist<t> append(t t);     //more abstract methods follow }

when i've let netbeans implement interface me, appeared:

public class mylist implements interflist  {   private object value;   @override   public interflist append(object t) {       throw new unsupportedoperationexception("not supported yet.");   } }

however, want keep template proper type of object accepted. eg.:

public class mylist<t> implements interflist  {   private t value;   @override   public interflist<t> append(t t) {       throw new unsupportedoperationexception("not supported yet.");   } }

the first approach allow kinds objects stored in list making quite mess.

the first approach, however, marked error in netbeans:

mylist not abstract , not implement method append(object) in interflist

you should do:

public class mylist<t> implements interflist<t>  {    private t value;    @override   public interflist<t> append(t t) {       throw new unsupportedoperationexception("not supported yet.");   } }

you want implement interflist<t>.

since implementing interflist without type parameters, you're implementing interflist<object>, causes error append method, takes t instead of object. want implement interflist<t>.


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