Javafx：当我单击按钮时，如何对计算进行编码以获得结果？
您应该使用eventListener或FXML。第二，我认为会更容易。需要榜样吗 更新：我添加了一个示例 Main.java Sample.fxmlJavafx：当我单击按钮时，如何对计算进行编码以获得结果？,javafx,Javafx,您应该使用eventListener或FXML。第二，我认为会更容易。需要榜样吗 更新：我添加了一个示例 Main.java Sample.fxml 是的，请提供一个例子 package javafx_tipcalc; import javafx.application.Application; import javafx.geometry.Insets; import javafx.geometry.Orientation; import javafx.geometry.Pos;
是的，请提供一个例子
package javafx_tipcalc;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Orientation;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
import java.text.NumberFormat;
public class JavaFX_TipCalc extends Application {
// declare interface controls
// declare labels
Label titleLabel, checkAmtLabel, tipPercentLabel, splitLabel;
Label tipAmtLabel, totalLabel, amtPerPersonLabel;
// declare text fields
TextField checkAmtText, tipAmtText, totalText, amtPerPersonText;
// declare a slider
Slider tipPercentSlider;
// declare a choice box
ChoiceBox splitChoiceBox;
// declare a button
Button calcTipButton;
// declare currency and percent formatter
NumberFormat currency = NumberFormat.getCurrencyInstance();
NumberFormat persent = NumberFormat.getCurrencyInstance();
// declare a grid pane (8 rows and 2 columns)
GridPane grid;
@Override
public void start(Stage primaryStage) {
// instantiate labels and their properties
titleLabel = new Label("Tip Calculator");
titleLabel.setMaxWidth(Double.MAX_VALUE);
titleLabel.setAlignment(Pos.CENTER);
checkAmtLabel = new Label("Check Amount");
checkAmtLabel.setMaxWidth(Double.MAX_VALUE);
checkAmtLabel.setAlignment(Pos.CENTER_RIGHT);
tipPercentLabel = new Label("Tip Percent: 15%");
tipPercentLabel.setMaxWidth(Double.MAX_VALUE);
tipPercentLabel.setAlignment(Pos.CENTER_RIGHT);
splitLabel = new Label("Split");
splitLabel.setMaxWidth(Double.MAX_VALUE);
splitLabel.setAlignment(Pos.CENTER_RIGHT);
tipAmtLabel = new Label("Tip Amount");
tipAmtLabel.setMaxWidth(Double.MAX_VALUE);
tipAmtLabel.setAlignment(Pos.CENTER_RIGHT);
totalLabel = new Label("Total");
totalLabel.setMaxWidth(Double.MAX_VALUE);
totalLabel.setAlignment(Pos.CENTER_RIGHT);
amtPerPersonLabel = new Label("Amount per Person");
amtPerPersonLabel.setMaxWidth(Double.MAX_VALUE);
amtPerPersonLabel.setAlignment(Pos.CENTER_RIGHT);
// instantiate text fileds and their properties
double textFieldWidth = 100;
checkAmtText = new TextField();
checkAmtText.setOnMouseClicked(e -> ResetFields());
checkAmtText.setPrefWidth(textFieldWidth);
checkAmtText.setAlignment(Pos.CENTER_RIGHT);
tipAmtText = new TextField();
tipAmtText.setFocusTraversable(false);
tipAmtText.setPrefWidth(textFieldWidth);
tipAmtText.setAlignment(Pos.CENTER_RIGHT);
tipAmtText.setEditable(false);
totalText = new TextField();
totalText.setFocusTraversable(false);
totalText.setPrefWidth(textFieldWidth);
totalText.setAlignment(Pos.CENTER_RIGHT);
totalText.setEditable(false);
amtPerPersonText = new TextField();
amtPerPersonText.setFocusTraversable(false);
amtPerPersonText.setPrefWidth(textFieldWidth);
amtPerPersonText.setAlignment(Pos.CENTER_RIGHT);
amtPerPersonText.setEditable(false);
// instantiate a slider and its properties
tipPercentSlider = new Slider();
tipPercentSlider.setPrefWidth(10);
tipPercentSlider = new javafx.scene.control.Slider();
tipPercentSlider.setPrefWidth(150);
tipPercentSlider.setMin(0);
tipPercentSlider.setMax(25);
tipPercentSlider.setMajorTickUnit(5);
tipPercentSlider.setMinorTickCount(1);
tipPercentSlider.setBlockIncrement(1);
tipPercentSlider.setShowTickLabels(true);
tipPercentSlider.setShowTickMarks(true);
tipPercentSlider.setSnapToTicks(true);
tipPercentSlider.setValue(15);
tipPercentSlider.setOrientation(Orientation.HORIZONTAL);
tipPercentSlider.valueProperty().addListener(
(observable, oldvalue, newvalue) ->
{
tipPercentLabel.setText(String.format("Tip Percent:
%2d%s",newvalue.intValue(),"%"));
} );
// instantiate a choice box and its properties
splitChoiceBox = new ChoiceBox();
splitChoiceBox.getItems().addAll("1 Way", "2 Ways", "3 Ways", "4
Ways", "5 Ways");
splitChoiceBox.setValue("1 Way");
splitChoiceBox.setPrefWidth(150);
// instantiate a button and its properties
calcTipButton = new Button("Calculate Tip");
calcTipButton.setMaxWidth(Double.MAX_VALUE);
calcTipButton.setOnAction(e -> CalcButtonClick()) ;
// instantiate a grid pane and its properties
grid = new GridPane();
grid.setHgap(10);
grid.setVgap(10);
grid.setPadding(new Insets(10));
grid.add(titleLabel, 0, 0, 2, 1);
grid.addRow(1, checkAmtLabel, checkAmtText);
grid.addRow(2, tipPercentLabel, tipPercentSlider);
grid.addRow(3, splitLabel, splitChoiceBox);
grid.add(calcTipButton, 0, 4, 2, 1);
grid.addRow(5, tipAmtLabel, tipAmtText);
grid.addRow(6, totalLabel, totalText);
grid.addRow(7, amtPerPersonLabel, amtPerPersonText);
// instantiate the grid pane and put items in in grid
Scene scene = new Scene(grid);
scene.getRoot().setStyle("-fx-font: 20 'Comic Sans MS'");
primaryStage.setTitle("Tip Calculator");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
private void CalcButtonClick() {
/*
Get the check amount from checkAmtText
Get the tip percent from the slider
Get the split the choice box
Tip amount = check amount * tip percent
Total amount = check amount + tip amount
Amount per person = total amount / split
Print the tip amount in tipAmtText
Print the total amount in total Text
Print the split amtPerPerson Text
*/
double tipAmnt, checkAmnt, tipPercent,
totalAmnt, AmntPerPerson;
tipAmnt = Double.parseDouble(tipAmtText.getText());
AmntPerPerson =
Double.parseDouble(amtPerPersonText.getText());
checkAmnt = Double.parseDouble(checkAmtText.getText());
totalAmnt = Double.parseDouble(totalText.getText());
tipPercent = Double.parseDouble(tipPercentLabel.getText());
tipAmnt = checkAmnt * tipPercent;
totalAmnt = checkAmnt + tipAmnt;
tipAmtText.setText(currency.format(tipAmnt));
totalText.setText(currency.format(totalAmnt));
}
private void ResetFields() {
/*
Clear the check amount
Clear the tip amount
Clear the total amount
Clear the amount per person
Set the tip percent slider to 15%
Set the split choice box to “1 Way”
*/
}
}
package application;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) {
try {
FXMLLoader fxmlLoader = new FXMLLoader();
fxmlLoader.setLocation((getClass().getResource("Sample.fxml")));
Parent panel = fxmlLoader.load();
Scene scene = new Scene(panel, 300, 150);
primaryStage.setTitle("Sum of two numbers");
primaryStage.setScene(scene);
primaryStage.show();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
<?import javafx.geometry.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="150.0" prefWidth="300.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.SampleController">
<children>
<AnchorPane prefHeight="55.0" prefWidth="300.0">
<children>
<HBox prefHeight="25.0" prefWidth="200.0" AnchorPane.leftAnchor="50.0" AnchorPane.rightAnchor="50.0">
<children>
<Label text="x">
<HBox.margin>
<Insets left="31.0" />
</HBox.margin>
</Label>
<Label text="y">
<HBox.margin>
<Insets left="62.0" />
</HBox.margin>
</Label>
<Label text="z">
<HBox.margin>
<Insets left="62.0" />
</HBox.margin>
</Label>
</children>
</HBox>
<HBox prefHeight="100.0" prefWidth="200.0" AnchorPane.bottomAnchor="20.0" AnchorPane.leftAnchor="50.0" AnchorPane.rightAnchor="50.0" AnchorPane.topAnchor="20.0">
<children>
<TextField fx:id="xTextField" />
<TextField fx:id="yTextField" />
<TextField fx:id="zTextField" />
</children>
</HBox>
</children>
</AnchorPane>
<AnchorPane prefHeight="200.0" prefWidth="200.0">
<HBox AnchorPane.bottomAnchor="20.0" AnchorPane.leftAnchor="50.0" AnchorPane.rightAnchor="50.0" AnchorPane.topAnchor="20.0">
<children>
<Button mnemonicParsing="false" onAction="#sumIt" text="Sum it!" AnchorPane.bottomAnchor="20.0" AnchorPane.leftAnchor="50.0" AnchorPane.rightAnchor="50.0" AnchorPane.topAnchor="20.0" />
</children>
<children>
<Button mnemonicParsing="false" onAction="#clearAll" text="Clear all!" AnchorPane.bottomAnchor="20.0" AnchorPane.leftAnchor="50.0" AnchorPane.rightAnchor="50.0" AnchorPane.topAnchor="20.0" />
</children>
</HBox>
</AnchorPane>
</children>
</VBox>
package application;
import javafx.fxml.FXML;
import javafx.scene.control.TextField;
public class SampleController {
@FXML
TextField xTextField, yTextField, zTextField;
public void sumIt() {
int sum;
sum = Integer.parseInt(xTextField.getText()) + Integer.parseInt(yTextField.getText());
zTextField.setText(Integer.toString(sum));
}
public void clearAll() {
xTextField.setText("");
yTextField.setText("");
zTextField.setText("");
}
}