JavaFX Hello Worldの例

投稿日: 2019-11-05 2019-11-05
タグ: hello world, javafx

JavaFX is a set of graphics and media packages that enable developers to
design, create, test, debug, and deploy rich client applications that
operate consistently across diverse platforms.

(Source:

Oracle

)

JDK 7u6以降、古いJavaインストールを使用している場合は、標準のJDKおよびJREバンドルにJavaFXが含まれています。http://docs.oracle.com/javafx/2/installation/jfxpub-installation.htm[ここで]。

JavaFX Hello worldの例

背景を描画する4つの
Rectangle 'と
Button`と
Label`の
BorderPane`をレイアウトするために `GridPane`を使う単純な例です。

JavaFxHelloWorld.java

package com.techfou.helloworld;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Font;
import javafx.stage.Stage;

public class JavaFxHelloWorld extends Application {

    private int counter = 0;

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

    @SuppressWarnings("static-access")
    public void start(Stage stage) {
        stage.setTitle("Hello World!");

        GridPane grid = new GridPane();
        grid.setHgap(0);
        grid.setVgap(0);

        Rectangle r1 = new Rectangle();
        r1.setFill(Color.DARKKHAKI);
        r1.setHeight(125);
        r1.setWidth(125);

        Rectangle r2 = new Rectangle();
        r2.setFill(Color.rgb(189, 40, 40));
        r2.setHeight(125);
        r2.setWidth(125);

        Rectangle r3 = new Rectangle();
        r3.setFill(Color.hsb(235, 0.52, 0.36));
        r3.setHeight(125);
        r3.setWidth(125);

        Rectangle r4 = new Rectangle();
        r4.setFill(Color.web("b894cc"));
        r4.setHeight(125);
        r4.setWidth(125);

        grid.add(r1, 0, 0);
        grid.add(r2, 0, 1);
        grid.add(r3, 1, 0);
        grid.add(r4, 1, 1);

        Label l = new Label();
        l.setFont(new Font("Calibri", 15));
        l.setTextFill(Color.BLACK);

        Button button = new Button();
        button.setFont(new Font("Calibri", 15));
        button.setText("Say 'Hello World'");

        button.setOnAction(new EventHandler<ActionEvent>() {
            public void handle(ActionEvent event) {
                l.setText("You said Hello to the world:
                    " + ++counter + ((counter == 1) ? " time" : " times"));
            }
        });

        BorderPane bp = new BorderPane();
        bp.setBottom(l);
        bp.setAlignment(l, Pos.CENTER);
        bp.setCenter(button);

        StackPane root = new StackPane();
        root.getChildren().add(grid);
        root.getChildren().add(bp);
        stage.setScene(new Scene(root, 250, 250));
        stage.show();

    }

}

出力:

javafx-helloworld-1