如何在 JavaFX 中建立警報?
警報是一個對話方塊,它顯示預構建的對話方塊型別。你可以透過例項化 javafx.scene.control.Alert 類來建立一個 警報。此類是 Dialog 類的子類。你可以在例項化時透過傳遞相應引數來建立必需型別的對話方塊,如下所示 -
Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
示例
下面的示例演示瞭如何建立 Alert。
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.ButtonBar.ButtonData;
import javafx.scene.control.ButtonType;
import javafx.scene.control.Dialog;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
public class AlertExample extends Application {
public void start(Stage stage) {
//Creating a dialog
Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
//Setting the title
alert.setTitle("Alert");
ButtonType type = new ButtonType("Ok", ButtonData.OK_DONE);
//Setting the content of the dialog
alert.setContentText("This is a confirmmation alert");
//Adding buttons to the dialog pane
alert.getDialogPane().getButtonTypes().add(type);
//Setting the label
Text txt = new Text("Click the button to show the dialog");
Font font = Font.font("verdana", FontWeight.BOLD, FontPosture.REGULAR, 12);
txt.setFont(font);
//Creating a button
Button button = new Button("Show Dialog");
//Showing the dialog on clicking the button
button.setOnAction(e -> {
alert.showAndWait();
});
//Creating a vbox to hold the button and the label
HBox pane = new HBox(15);
//Setting the space between the nodes of a HBox pane
pane.setPadding(new Insets(50, 150, 50, 60));
pane.getChildren().addAll(txt, button);
//Creating a scene object
Scene scene = new Scene(new Group(pane), 595, 300, Color.BEIGE);
stage.setTitle("Alert");
stage.setScene(scene);
stage.show();
}
public static void main(String args[]){
launch(args);
}
}輸出

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