java-tutorials/play-framework/introduction/app/services/Counter.java

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package services;
/**
* This interface demonstrates how to create a component that is injected
* into a controller. The interface represents a counter that returns a
* incremented number each time it is called.
*
* The {@link Modules} class binds this interface to the
* {@link AtomicCounter} implementation.
*/
public interface Counter {
int nextCount();
}