以下是此类的代码：MainMenu和SupplierRegistration。我在MainMenu类中只有一个名为“添加新的供应商”的按钮，我想添加功能，这样，一旦单击此按钮，我便可以移至SupplierRegistration屏幕，并且当我在vendorRegistration屏幕我可以切换到MainMenu屏幕，但要求是两个屏幕不能同时打开。我正在努力实现此功能。有人可以提供我的代码吗，我将非常感谢，谢谢！
public class MainMenu extends Application {
Scene mainMenuScene;
Button addSupplierBtn;
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setTitle("Main Menu");
addSupplierBtn = new Button("Add a new Supplier");
// the layout.
StackPane layout = new StackPane();
layout.getChildren().add(addSupplierBtn);
mainMenuScene = new Scene(layout, 300, 250);
primaryStage.setScene(mainMenuScene);
primaryStage.show();
}
}
// now the supplierRegistration class.
public class supplierRegistration extends Application {
Stage window;
@Override
public void start(Stage primaryStage) throws Exception {
window = primaryStage;
window.setTitle("Supplier Registration Form");
GridPane gridPane = registrationPane();
addUI(gridPane);
Scene scene = new Scene(gridPane, 800, 500);
window.setScene(scene);
window.show();
}
public static void main(String[] args) {
launch(args);
}
// now the layout.
private GridPane registrationPane() {
// declare and initliase a new GridPane layout.
GridPane gridPane = new GridPane();
// position the pane at the center.
gridPane.setAlignment(Pos.CENTER);
// set padding
gridPane.setPadding(new Insets(40, 40, 40, 40));
gridPane.setHgap(10);
gridPane.setVgap(10);
// add column constraints
ColumnConstraints columnone = new ColumnConstraints(100, 100, Double.MAX_VALUE);
columnone.setHalignment(HPos.RIGHT);
ColumnConstraints columntwo = new ColumnConstraints(200, 200, Double.MAX_VALUE);
columntwo.setHgrow(Priority.ALWAYS);
gridPane.getColumnConstraints().addAll(columnone, columntwo);
return gridPane;
}
private void addUI(GridPane gridPane) {
// add header
Label header = new Label("Register Supplier");
header.setFont(Font.font("Arial Nova Light", FontWeight.BOLD, 22));
gridPane.add(header, 0, 0, 3, 1);
GridPane.setHalignment(header, HPos.CENTER);
GridPane.setMargin(header, new Insets(20, 0, 20, 0));
// full name label.
Label fullName = new Label("Full Name");
fullName.setMaxWidth(222); // 1240
gridPane.add(fullName, 0, 1);
// name textfield.
TextField inputName = new TextField();
inputName.setPrefHeight(28);
inputName.setMaxWidth(222);
gridPane.add(inputName, 1, 1);
// addressline1 label.
Label addressline1 = new Label("Address Line 1");
addressline1.setMaxWidth(164);
gridPane.add(addressline1, 0, 2);
// addressline 1 textfield.
TextField inputAddressLine1 = new TextField();
inputAddressLine1.setPrefHeight(28);
inputAddressLine1.setMaxWidth(222);
gridPane.add(inputAddressLine1, 1, 2);
// addressline 2 label.
Label addressline2 = new Label("Address Line 2");
addressline2.setMaxWidth(164);
gridPane.add(addressline2, 0, 3);
// addressline 2 textfield.
TextField inputAddressLine2 = new TextField();
inputAddressLine2.setPrefHeight(28);
inputAddressLine2.setMaxWidth(222);
gridPane.add(inputAddressLine2, 1, 3);
// postcode label.
Label postCode = new Label("Post Code");
postCode.setMaxWidth(164);
gridPane.add(postCode, 0, 4);
// textfield for postcode
TextField inputPostCode = new TextField();
inputPostCode.setPrefHeight(28);
inputPostCode.setMaxWidth(108);
gridPane.add(inputPostCode, 1, 4);
// email label.
Label email = new Label("Email");
email.setMaxWidth(164);
gridPane.add(email, 0, 5);
// textfield for email.
TextField inputEmail = new TextField();
inputEmail.setPrefHeight(28);
inputEmail.setMaxWidth(222);
gridPane.add(inputEmail, 1, 5);
// label for cell phone number.
Label mobilePhone = new Label("Mobile Phone");
mobilePhone.setMaxWidth(164);
gridPane.add(mobilePhone, 0, 6);
// textfield for cell number.
TextField mobileNumber = new TextField();
mobileNumber.setPrefHeight(28);
mobileNumber.setMaxWidth(222);
gridPane.add(mobileNumber, 1, 6);
// submit button.
Button submitBtn = new Button("Submit");
submitBtn.setId("submitBtn");
submitBtn.setPrefHeight(36);
submitBtn.setDefaultButton(true);
submitBtn.setPrefWidth(82);
gridPane.add(submitBtn, 0, 7, 2, 1);
GridPane.setHalignment(submitBtn, HPos.LEFT);
GridPane.setMargin(submitBtn, new Insets(30, 0, 30, 0));
// back button which will take the user to the main menu.
Button backBtn = new Button("Back");
backBtn.setId("backBtn");
backBtn.setPrefHeight(36);
backBtn.setDefaultButton(true);
backBtn.setPrefWidth(82);
gridPane.add(backBtn, 0, 8, 2, 1);
GridPane.setHalignment(backBtn, HPos.RIGHT);
GridPane.setMargin(backBtn, new Insets(30, 0, 30, 0));
submitBtn.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
if (inputEmail.getText().isEmpty() && mobileNumber.getText().isEmpty()) {
alertBox(Alert.AlertType.ERROR, gridPane.getScene().getWindow(), "Error",
"Please provide either a valid email address or contact no");
return;
} else if (inputName.getText().isEmpty()) {
alertBox(Alert.AlertType.ERROR, gridPane.getScene().getWindow(), "Error",
"Name Field cannot be empty!");
return;
} else if (inputAddressLine1.getText().isEmpty() && inputAddressLine2.getText().isEmpty()) {
alertBox(Alert.AlertType.ERROR, gridPane.getScene().getWindow(), "Error",
"Address field cannot be empty!");
return;
} else if (postCode.getText().isEmpty()) {
alertBox(Alert.AlertType.ERROR, gridPane.getScene().getWindow(), "Error",
"Post Code cannot be empty");
return;
}
alertBox(Alert.AlertType.CONFIRMATION, gridPane.getScene().getWindow(), "Confirmation",
"Supplier has been successfully registered!");
}
});
// backBtn.setOnAction(e -> window.setScene(mainMenuScene));
}
private void alertBox(Alert.AlertType alertType, Window admin, String title, String message) {
Alert alert = new Alert(alertType);
alert.setTitle(title);
alert.setHeaderText(null);
alert.setContentText(message);
alert.initOwner(admin);
alert.show();
}
}
答案 0 :(得分：0)
一个程序应该只有一个类Application。 Remove扩展了SupplierRegistration类的Aplication并将方法设置为public。
在MainMenu中：
Button addSupplierBtn = new Button();
addSupplierBtn.setOnAction(event -> {
SupplierRegistration regis = new SupplierRegistration();
GridPane gridPane = regis.registrationPane();
regis.addUI(gridPane);
primaryStage.setTitle("Supplier Registration Form");
primaryStage.setScene(new Scene(gridPane));
});
所以，另一种方法是使用param将所有内容放入构造函数中：window和show方法
public SupplierRegistration( Stage stage) {
this.window= stage;
}
public void show(){
GridPane gridPane = registrationPane();
addUI(gridPane);
window.setTitle("Supplier Registration Form");
window.setScene(new Scene(gridPane));
}