While sheet was the previous implementation of what? Of an interface seems to me.Īnd which method they are using, if interfaces provide abstract method? No problem the first line, I create a new element, a label (that is a text cell) īut the second? again, addCell is a interface method seeing the api! Then in the sample code I arrive to this: Label lblNome = new Label(0, 1, 'Nome:') While, then, using the createSheet method (provided by WritableWorkbook), it seems I'm creating a WritableSheet. But, I thought that I wasn't able to create an object from an interface. And 'WritableSheet' is a subinterface of another interface, which is 'Sheet'. The sheet is a 'WritableSheet', but this is an interface! And seeing the api, there are no implementing classes. And until this, I'm there.īut, then, what am I doing in the second instruction? I'm creating the workbook using the static method provided by Workbook that is a superclass of WritableWorkbook. That is, the workbook object was previously instantiated and is a WritableWorkbook object. WritableSheet sheet = workbook.createSheet('first sheet', 0) So I was studying a sample code of jxl api, to write and read an excel file, and I arrived to this point: workbook = Workbook.createWorkbook(new File('/home/me/workspace/files/output.xls')) Well I know that an interface 'provides' only abstract methods to be implemented by the concrete subclasses. I'm quite new to Java and am stuck with this, please.

Jxl api example