DataBindingLogic

DataBindingLogic.java

public class DataBindingLogic {
    private Property<String> input1 = new Property<String>(null);
    private Property<String> input2 = new Property<String>(null);
    private Property<String> output = new Property<String>(null);
    private CalculatorLogic logic = new CalculatorLogic();

    private Property<Object> button = new Property<String>(null) {
        @Override protected void onChange(Object unused) {
            output.set(logic.addStrings(input1.get(), input2.get()));
        }
    }
}