gistfile1.txt

public class ButtonOperator extends Button {
    /*public ButtonOperator(final CalculatorController controller,
        final AbstractOperator op) {
        super(op.label);
   
        this.addClickHandler(new ClickHandler() {

			@Override
			public void onClick(ClickEvent event) {
				controller.processOperator(op);
			}
        	
        });
        this.setStyleName(CalculatorConstants.STYLE_BUTTON);
    }*/
    
    public ButtonOperator(final CalculatorController controller,
            final BinaryOperator op) {
            super(op.label);
       
            this.addClickHandler(new ClickHandler() {

    			@Override
    			public void onClick(ClickEvent event) {
    				controller.processOperator(op);
    			}
            	
            });
            this.setStyleName(CalculatorConstants.STYLE_BUTTON);
        }
    
    public ButtonOperator(final CalculatorController controller,
            final UnaryOperator op) {
            super(op.label);
       
            this.addClickHandler(new ClickHandler() {

    			@Override
    			public void onClick(ClickEvent event) {
    				controller.processOperator(op);
    			}
            	
            });
            this.setStyleName(CalculatorConstants.STYLE_BUTTON);
        }
    
   
}