如何使用 JavaFX 将选择框、复选框和文本字段实现为一个按钮 [关闭]
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【中文标题】如何使用 JavaFX 将选择框、复选框和文本字段实现为一个按钮 [关闭]【英文标题】：How can a choice box, checkbox, and text field be implemented into one button with JavaFX [closed] 【发布时间】：2021-07-18 04:41:33 【问题描述】：我正在尝试创建一个程序，该程序可以从选择框、复选框和文本字段中获取数据，并将其作为输出放入单个 textArea 中。如何通过一个按钮组合所有信息。我已经创建了选择框、复选框和文本字段。
-有两个文本字段。其中一个取名字，另一个取数字。该数字将决定程序循环的次数。
-复选框将在名字前面加上什么样的前缀（先生、夫人等）。
-选择框给出了关于将给出什么后续声明的选项。 （今天过得怎么样？我喜欢你的帽子等）
点击按钮后，如果 textField 中的数字输入为 2，程序将在 textArea 中显示类似的内容
“1您好，Johnson 先生。今天过得怎么样？”
“2您好，Johnson 先生。今天过得怎么样？”
这就是我在按钮事件处理程序中的内容。它只实现文本字段
private class CreateButtonHandler implements EventHandler<ActionEvent>
@Override
public void handle(ActionEvent event)
int i = 0;
String myString = number.getText();
int foo = Integer.parseInt(myString);
do
OutputTxtArea.setText(OutputTxtArea.getText() + (i + 1) + "Hello " + firstNameTxtFld.getText() + "\n");
while(i<foo);
【问题讨论】：
您可以通过调用...getValue() 从ChoiceBox 中获取选定的值。您可以致电CheckBox.isSelected() 来确定@987654326@ 是否被...选中。
我还建议学习 Java naming conventions 并坚持下去。
【参考方案1】：
绑定！
如果您将布局与数据和动作分开，然后让动作作用于数据，事情会更容易做。这使得屏幕只是一个屏幕，您不必担心“我如何处理获取 CheckBox 值？”诸如此类的问题。
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import org.jetbrains.annotations.NotNull;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
public class Greeter extends Application
public static void main(String[] args)
launch(args);
@Override
public void start(Stage primaryStage)
Model model = new Model();
ChoiceBox<String> questionChoiceBox = new ChoiceBox<>(model.questionList);
TextArea textArea = new TextArea("");
textArea.textProperty().bind(model.greetingProperty());
VBox vBox = new VBox(20,
createBoundCheckBox("Miss", model.isMissProperty()),
createBoundCheckBox("Missus", model.isMissusProperty()),
createBoundCheckBox("Mister", model.isMisterProperty()),
questionChoiceBox,
createBoundTextField(model.nameProperty()),
createBoundTextField(model.loopCountProperty()),
textArea);
primaryStage.setScene(new Scene(vBox, 200, 300));
primaryStage.show();
@NotNull
private Node createBoundCheckBox(String label, BooleanProperty boundProperty)
CheckBox checkBox = new CheckBox(label);
boundProperty.bind(checkBox.selectedProperty());
return checkBox;
private Node createBoundTextField(StringProperty boundProperty)
TextField textField = new TextField();
boundProperty.bind(textField.textProperty());
return textField;
class Model
private StringProperty loopCount = new SimpleStringProperty("");
private BooleanProperty isMister = new SimpleBooleanProperty(false);
private BooleanProperty isMissus = new SimpleBooleanProperty(false);
private BooleanProperty isMiss = new SimpleBooleanProperty(false);
private StringProperty name = new SimpleStringProperty("");
private StringProperty question = new SimpleStringProperty("");
private ObservableList<String> questionList = FXCollections.observableArrayList();
Model()
questionList.add("How was your day?");
questionList.add("Would you like kippers for breakfast");
public StringProperty loopCountProperty()
return loopCount;
public BooleanProperty isMisterProperty()
return isMister;
public BooleanProperty isMissusProperty()
return isMissus;
public BooleanProperty isMissProperty()
return isMiss;
public StringProperty nameProperty()
return name;
public StringProperty questionProperty()
return question;
public ObservableList<String> getQuestionList()
return questionList;
public ObservableValue<String> greetingProperty()
return Bindings.createStringBinding(() -> buildGreeting(), loopCount, isMiss, isMissus, isMister, question, name);
private String buildGreeting()
int howMany;
try
howMany = Integer.parseInt(loopCount.get());
catch (Exception e)
return "";
String title = "Master of Time and Space";
if (isMiss.get())
title = "Miss";
if (isMissus.get())
title = "Mrs.";
if (isMister.get())
title = "Mr.";
String greeting = "Hello " + title + " " + name.get() + " " + question.get();
return IntStream.range(1, howMany + 1).mapToObj(idx -> idx + greeting).collect(Collectors.joining("\n"));
所以现在布局只是一个布局，屏幕上的所有控件的值属性都绑定到模型上。然后模型有代码把所有的东西放在一起来创建结果。从技术上讲，该代码应该属于某种业务逻辑类，但这至少应该让您有所了解。
我省略了按钮，因为它并没有真正添加任何有意义的功能，而且它对 UI 有一点问题。无法指示 TextArea 中的结果是否是最后一次单击按钮时的结果。例如，您可以单击按钮，然后选择另一个标题复选框，现在屏幕上的选择与 TextArea 不匹配。但是用户无法知道这一点，要实现它，您可能必须使用 DirtyFX 库之类的东西。
但如果你真的想要一个按钮，那么你所要做的就是为结果引入一个新的 StringProperty，然后让按钮在其 EventHandler 中调用 Model.buildGreeting()：
import javafx.application.Application;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import org.jetbrains.annotations.NotNull;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
public class GreeterButton extends Application
public static void main(String[] args)
launch(args);
@Override
public void start(Stage primaryStage)
Model model = new Model();
ChoiceBox<String> questionChoiceBox = new ChoiceBox<>(model.questionList);
TextArea textArea = new TextArea("");
textArea.textProperty().bind(model.greetingProperty());
Button button = new Button("Say Hi!");
button.setOnAction(evt -> model.updateGreeting());
VBox vBox = new VBox(20,
createBoundCheckBox("Miss", model.isMissProperty()),
createBoundCheckBox("Missus", model.isMissusProperty()),
createBoundCheckBox("Mister", model.isMisterProperty()),
questionChoiceBox,
createBoundTextField(model.nameProperty()),
createBoundTextField(model.loopCountProperty()),
button,
textArea);
primaryStage.setScene(new Scene(vBox, 200, 300));
primaryStage.show();
@NotNull
private Node createBoundCheckBox(String label, BooleanProperty boundProperty)
CheckBox checkBox = new CheckBox(label);
boundProperty.bind(checkBox.selectedProperty());
return checkBox;
private Node createBoundTextField(StringProperty boundProperty)
TextField textField = new TextField();
boundProperty.bind(textField.textProperty());
return textField;
class Model
private StringProperty loopCount = new SimpleStringProperty("");
private BooleanProperty isMister = new SimpleBooleanProperty(false);
private BooleanProperty isMissus = new SimpleBooleanProperty(false);
private BooleanProperty isMiss = new SimpleBooleanProperty(false);
private StringProperty name = new SimpleStringProperty("");
private StringProperty question = new SimpleStringProperty("");
private StringProperty greeting = new SimpleStringProperty("");
private ObservableList<String> questionList = FXCollections.observableArrayList();
Model()
questionList.add("How was your day?");
questionList.add("Would you like kippers for breakfast");
public StringProperty loopCountProperty()
return loopCount;
public BooleanProperty isMisterProperty()
return isMister;
public BooleanProperty isMissusProperty()
return isMissus;
public BooleanProperty isMissProperty()
return isMiss;
public StringProperty nameProperty()
return name;
public StringProperty questionProperty()
return question;
public ObservableList<String> getQuestionList()
return questionList;
String buildGreeting()
int howMany;
try
howMany = Integer.parseInt(loopCount.get());
catch (Exception e)
return "";
String title = "Master of Time and Space";
if (isMiss.get())
title = "Miss";
if (isMissus.get())
title = "Mrs.";
if (isMister.get())
title = "Mr.";
String greeting = "Hello " + title + " " + name.get() + " " + question.get();
return IntStream.range(1, howMany + 1).mapToObj(idx -> idx + greeting).collect(Collectors.joining("\n"));
public void updateGreeting()
greeting.set(buildGreeting());
public StringProperty greetingProperty()
return greeting;
【讨论】：
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