如何更改窗口并从javaFX中的窗口获取输入？

Question

在我的javaFX程序中，我想从窗口（名称和收件人）获取输入并在控制台中显示输入（使用System.out.println（））。但它从不打印该值。

而我也想改变窗口，当我按“开始”按钮，我试图用一个标志“我”但它没有工作，我该如何解决它？请任何帮助，将非常感激。

public class Client extends Application{ 

String name, sname; 
TextField userTextField = new TextField(); 
TextField fTextField = new TextField(); 
String recip; 
TextFlow textFlow = new TextFlow(); 
ScrollPane sp = new ScrollPane(); 
Button button = new Button("Send"); 
int i=0; 
public Parent content() { 
    GridPane grid = new GridPane(); 
    grid.setAlignment(Pos.CENTER); 
    grid.setHgap(10); 
    grid.setVgap(10); 
    grid.setPadding(new Insets(25, 25, 25, 25)); 
    Text scenetitle = new Text("Welcome"); 
    scenetitle.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20)); 
    grid.add(scenetitle, 0, 0, 2, 1); 
    Label userName = new Label("User Name:"); 
    grid.add(userName, 0, 1); 
    grid.add(userTextField, 1, 1); 
    Label fName = new Label("Friend Name:"); 
    grid.add(fName, 0, 2); 
    grid.add(fTextField, 1, 2); 
    Button button = new Button("Start"); 
    DropShadow shadow = new DropShadow(); 
    button.addEventHandler(MouseEvent.MOUSE_ENTERED, (MouseEvent e) -> { 
     button.setEffect(shadow); 
    }); 
    button.addEventHandler(MouseEvent.MOUSE_EXITED, (MouseEvent e) -> { 
     button.setEffect(null); 
    }); 
    button.setOnAction(e -> grid.getScene().getWindow().hide()); 
    grid.add(button,1,6); 
    String name; 
    name = userTextField.getText(); 
    System.out.println(name); 
    recip = fTextField.getText(); 
    System.out.println(recip); 
    return grid; 
} 
public Parent createContent(){ 
    textFlow.setPadding(new Insets(10)); 
    textFlow.setLineSpacing(10); 
    TextField textField = new TextField(); 
    textField.setPrefSize(300,30); 
    button.setPrefSize(80,30); 
    VBox container = new VBox(); 
    VBox box = new VBox(); 
    box.getChildren().addAll(sp,textFlow); 
    container.setPadding(new Insets(10)); 
    container.getChildren().addAll(box, new HBox(textField, button)); 
    VBox.setVgrow(sp, Priority.ALWAYS); 
    VBox.setVgrow(textFlow, Priority.ALWAYS); 
    return container; 
    } 
    public void start(Stage stage) throws IOException { 
    Parent q= content(); 
    Scene scene = new Scene(q,300,400); 
    stage.setScene(scene); 
    stage.setTitle("Chit-Chat"); 
    stage.show(); 
     if (i == 1) { 
      VBox vb = new VBox(); 
      vb.getChildren().addAll(textFlow); 
      sp.setVmax(440); 
      sp.setPrefSize(400, 300); 
      sp.setContent(vb); 
      sp.vvalueProperty().bind((ObservableValue<? extends Number>) vb.heightProperty()); 
      Parent p = createContent(); 
      Scene scene2 = new Scene(p, 400, 300); 
      stage.setScene(scene2); 
      stage.setTitle("Chit-Chat"); 
      stage.show(); 
     } 
    } 
} 

public static void main(String[] args) throws IOException { 
    launch(args); 
} 

} 

Answer 1

我修复了您的代码。请检查注释。

String name, sname; 
TextFlow textFlow = new TextFlow(); 
ScrollPane sp = new ScrollPane(); 
TextField userTextField = new TextField(); 
TextField fTextField = new TextField(); 
String recip; 
Button button = new Button("Send"); 
//not used int i = 0; 

public Parent content() { 
    GridPane grid = new GridPane(); 
    grid.setAlignment(Pos.CENTER); 
    grid.setHgap(10); 
    grid.setVgap(10); 
    grid.setPadding(new Insets(25, 25, 25, 25)); 
    Text scenetitle = new Text("Welcome"); 
    scenetitle.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20)); 
    grid.add(scenetitle, 0, 0, 2, 1); 
    Label userName = new Label("User Name:"); 
    grid.add(userName, 0, 1); 
    grid.add(userTextField, 1, 1); 
    Label fName = new Label("Friend Name:"); 
    grid.add(fName, 0, 2); 
    grid.add(fTextField, 1, 2); 
    Button button = new Button("Start"); 
    DropShadow shadow = new DropShadow(); 
    button.addEventHandler(MouseEvent.MOUSE_ENTERED, (MouseEvent e) -> { 
     button.setEffect(shadow); 
    }); 
    button.addEventHandler(MouseEvent.MOUSE_EXITED, (MouseEvent e) -> { 
     button.setEffect(null); 
    }); 
    button.setOnAction(e -> 
    { 
     //Show value on console 
     System.out.println("user name\t"+userTextField.getText()); 
     System.out.println("friend name\t"+fTextField.getText()); 
     //should not hide. 
     //grid.getScene().getWindow().hide(); 

     if(userTextField.getText().equals("matched value") & fTextField.getText().equals("matched value")) 
     {     
      //show new pane onto current pane 
      createContent(); // you should fix the function 
      grid.setVisible(false); // hide current pane 
      textFlow.setVisible(true);// show up new pane 
     } 
     else 
     { 
      //do something to remind user 
     } 
    }); 
    grid.add(button, 1, 6); 

    // this should do in the Event Listener 
    //String name; 
    //name = userTextField.getText(); 
    //System.out.println(name); 
    //recip = fTextField.getText(); 
    //System.out.println(recip); 

    return grid; 
} 

//create your second pane here. 
public Parent createContent() { 
    textFlow.setPadding(new Insets(10)); 
    textFlow.setLineSpacing(10); 
    TextField textField = new TextField(); 
    textField.setPrefSize(300, 30); 
    button.setPrefSize(80, 30); 
    VBox container = new VBox(); 
    VBox box = new VBox(); 
    box.getChildren().addAll(sp, textFlow); 
    container.setPadding(new Insets(10)); 
    container.getChildren().addAll(box, new HBox(textField, button)); 
    VBox.setVgrow(sp, Priority.ALWAYS); 
    VBox.setVgrow(textFlow, Priority.ALWAYS); 
    return container; 
} 

@Override 
public void start(Stage stage) throws IOException { 
    Parent q = content(); 
    Scene scene = new Scene(q, 300, 400); 
    stage.setScene(scene); 
    stage.setTitle("Chit-Chat"); 
    stage.show(); 


    /* no, not work here 
    if (i == 1) { 
     VBox vb = new VBox(); 
     vb.getChildren().addAll(textFlow); 
     sp.setVmax(440); 
     sp.setPrefSize(400, 300); 
     sp.setContent(vb); 
     sp.vvalueProperty().bind((ObservableValue<? extends Number>) vb.heightProperty()); 
     Parent p = createContent(); 
     Scene scene2 = new Scene(p, 400, 300); 
     stage.setScene(scene2); 
     stage.setTitle("Chit-Chat"); 
     stage.show(); 
    }*/ 

} 

public static void main(String[] args) throws IOException { 
    launch(args); 
}