我有一个单例类：

@Singleton
class Inject_Class_A @Inject()(
                            wsClient: WSClient,
                          )(implicit executionContext: ExecutionContext) {
// ... does something

}

我有另一个主类，我想注入前一个类，它也有其他构造参数。IDE说它在语法上是正确的：

class Main_Class @Inject()(
                           inject_class_A: Inject_Class_A,
                           implicit val executionContext: ExecutionContext
                           )(key: String, value: String) {

// ... does something different using inject_class_A
}

现在我想创建对象为：

val main_class = new Main_Class(key: "KEY", value:"VALUE")

当然，它给出了错误：

Unspecified value parameters: inject_class_A: Inject_Class_A, executionContext: ExecutionContext

我也试过这种方法：

class Main_Class(key: String, value: String) {

  @Inject val inject_class_A: Inject_Class_A = new Inject_Class_A()

// ... does something different using inject_class_A
}

但这不起作用，因为我没有wsClient: WSClient和executionContext: ExecutionContext，这些我只能从注射只。