Java Policy-Based Design

I have a while loop, and the user should be able to decide when the loop stops. After x seconds, after x loops, ... This problem should be implemented according to policy-based design. I know how to do this in C++ but can't get it to work in Java.

What I do now is the following.

There is a class Auctioneer with the method "start()" where the policies should be applicable:

public <E extends AbstractEndAuctionPolicy> void start(E policy) { //use policy here }

Because AbstractEndAuctionPolicy has the method "endAuction()", we are able to do: policy.endAuction(). In C++ there is no need for "extends AbstractEndAuctionPolicy" ...

But I can not figure out how to use this method, the following开发者_如何学Python is not working:

this.auctioneer.start<NewBidPolicy>(n);

Hope you guys can help me and inform me a bit about policy-based design in Java because Google is not giving me answers.

Thanks in advance.

Usually the compiler is able to figure out the generic type from the parameter type, i.e. simply

this.auctioneer.start(n);

may work (it is hard to tell for sure, since you give so little context). But if this does not satisfy the compiler, try

this.auctioneer.<NewBidPolicy>start(n);

Since Java generics are so much less powerful than C++ templates, I haven't even heard the term "policy" being used much in the Java realm. However, your approach seems to be a good approximation.