Question

Ok I feel really dumb asking this but I seem to be missing something really simple here. I have the following code in a class in my service layer –

public Items getItems(String category, float amount, String color,
            String type)

The code reads from a database and returns the results – I plan on placing it in a jframe. Nice and simple. But no matter how I call it from the jframe I get errors in eclipse that the code is wrong – either that their are illegal modifiers or such. So obviously I am calling it completely wrong, so my stupid question is how do you call that method into a jframe?

For example – if I try to call it this way:

public Items getItems();  

I get told that getItems is an illegal parameter.
If I call this.. Items getItems(); I am told its undefined

Answer 1

Since you put some code up there, you are invoking the method wrong; what you have is not valid Java.

First you need to get an instance of your service.

MyService service = new MyServiceImpl();

I’m assuming your service is defined as an interface (MyService), with a class that implements the interface (MyServiceImpl).

then you invoke the method on the instance

Items items = service.getItems(stuff);

what you have

public Items getItems();

is some sort of hybrid between a method definition and a method invocation.