Java tutorial
package codeOrchestra.lcs.license; import org.eclipse.jface.dialogs.InputDialog; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.window.Window; import org.eclipse.swt.widgets.Display; import codeOrchestra.lcs.macAddress.SystemCheck; /** * @author Alexander Eliseyev */ public abstract class AbstractExpirationWithLocalSerialValidationStrategy extends AbstractExpirationWithSerialNumberStrategy { public boolean showSerialNumberDialog() { InputDialog inputDialog = new InputDialog(Display.getDefault().getActiveShell(), "Serial number", "Please type the serial number purchased", null, null); if (inputDialog.open() == Window.CANCEL) { return false; } String serialNumber = inputDialog.getValue(); if (serialNumber != null) { if (SystemCheck.getInstance().isValidMACAddress(serialNumber)) { MessageDialog.openInformation(Display.getDefault().getActiveShell(), "Serial number", "Thank you for choosing the Code Orchestra Livecoding Tool!"); registerProduct(serialNumber, null); return true; } else { MessageDialog.openError(Display.getDefault().getActiveShell(), "Serial number", "The serial number entered is invalid."); return showSerialNumberDialog(); } } return false; } }