我已经在我的代码使用的策略模式,这里是一个简短的片段:奇怪未检查转换警告
public interface FindingStrategy<T> {
Callable<T> setAction();
}
class FindSomething implements BindingActionStrategy {
...
@Override
public Callable<SomeObject> setAction() {
return new Callable<SomeObject>() {
@Override
public SomeObject call() throws ... {
return (SomeObject)binding.findSomething(somethingsId);
}
};
}
...
}
别的地方我做的:
Callable<SomeObject> ts = (Callable<SomeObject>) strategy.setAction();
和编译器的信号:
unchecked conversion warning
required: Callable<SomeObject>
found: Callable
奇怪的是,如果我这样做,没有任何警告:
Callable<SomeObject> ts = new Callable<SomeObject>() {
@Override
public SomeObject call() throws ... {
return (SomeObject)binding.findSomething(somethingsId);
}
};
我该如何解决这个问题?我试图改变很多,但我仍然收到警告。请帮忙!
什么是'strategy'变量的类型? –