共計 1254 個字符，預計需要花費 4 分鐘才能閱讀完成。

Java 可以使用 JavaFX 或 Swing 來實現畫圖板功能。下面是一個簡單的示例代碼，演示如何使用 JavaFX 實現一個簡單的畫圖板：

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class DrawingBoard extends Application {
private double startX, startY, endX, endY;
@Override
public void start(Stage primaryStage) {Canvas canvas = new Canvas(800, 600);
GraphicsContext gc = canvas.getGraphicsContext2D();
gc.setStroke(Color.BLACK);
gc.setLineWidth(1.0);
canvas.addEventHandler(MouseEvent.MOUSE_PRESSED, event -> {if (event.getButton() == MouseButton.PRIMARY) {startX = event.getX();
startY = event.getY();}
});
canvas.addEventHandler(MouseEvent.MOUSE_DRAGGED, event -> {if (event.getButton() == MouseButton.PRIMARY) {endX = event.getX();
endY = event.getY();
gc.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());
gc.strokeRect(startX, startY, endX - startX, endY - startY);
}
});
VBox root = new VBox(canvas);
Scene scene = new Scene(root, 800, 600);
primaryStage.setTitle("Drawing Board");
primaryStage.setScene(scene);
primaryStage.show();}
public static void main(String[] args) {launch(args);
}
}

運行這段代碼，將會彈出一個窗口，你可以在窗口內點擊并拖動鼠標左鍵來繪制矩形。

丸趣 TV 網 – 提供最優質的資源集合！