public void actionPerformed(ActionEvent evt) { String actionCommand = evt.getActionCommand(); if (actionCommand.equals("Add")) { buttonPane.addVar = true; } else if (actionCommand.equals("Reset")) { canvasPane.clearCanvas(); } else if (actionCommand.equals("Down")) { buttonPane.addRel = true; } else if (actionCommand.equals("Export")) { canvasPane.exportClass(); } }