如何获取值并将其从一个类传递到另一个类? [英] How to get and pass a value from a class to another?

问题描述

我正在尝试创建TextField以获取用户名.我创建了一个用于包含UI组件的新类.

I'm trying to create a TextField to get a users name. I've created a new class for containing UI components.

import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class start extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        Label label = new Label("Name:");
        TextField textField = new TextField();
        HBox hBox = new HBox();
        hBox.getChildren().addAll(label,textField);
        hBox.setSpacing(10);
        Scene scene = new Scene(hBox,300,200);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Hello");
        primaryStage.show();
    }
}

我想获得在"Hello"窗口中输入的名称，以便在另一个类ShowOff中使用它.

I want to get the name entered in the "Hello" window to use it in another class ShowOff.

ShowOff类

import javafx.application.Application;

public class ShowOff {
    ShowOff() {
        Application.launch(start.class,"myClass");
    }

    public static void main(String[] args)
    {

    }
}

我该怎么实现?

推荐答案

您将把标签的引用传递到类中.我建议阅读此以获取更多信息.

You would pass a reference of your label into the class. I recommend reading this for more information.

但是关于您的代码.这是我的修改方式:

But in regards to your code. Here is how I would revise it:

  public class Start extends Application {

  public static void main(String[] args)  {
      Application.launch(Start.class,"myClass");
  }

  @Override
  public void start(Stage primaryStage) throws Exception {
    Label label = new Label("Name:");
    TextField textField = new TextField();
    HBox hBox = new HBox();
    hBox.getChildren().addAll(label,textField);
    hBox.setSpacing(10);
    Scene scene = new Scene(hBox,300,200);
    primaryStage.setScene(scene);
    primaryStage.setTitle("Hello");
    primaryStage.show();

    textField.textProperty().addListener(new ChangeListener<String>() {
        @Override
        public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
          //Handle the change in the text value here
        }
    });
  }
}

现在在这种情况下，我删除了您的ShowOff类，但是如果您需要澄清，请告诉我.

Now in this case I removed your ShowOff class but if you need some clarification let me know.

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