Button handling and output (Wicket framework)

I have got a task to write a calculator on wicket and I have faced with some problems.

How to get button value(1,2,3...-,+,/,*) handle it(multiply or divide) and output a result to text field to user? Could you help me, please.

In swing it is really easy, e.g. new JtextField.setText("Shalom world!"); How I can do the same in wicket? Thank you