# 12/18 正課作業8
## HW8_1 (15.1)
編寫一個程式，讓使用者可以點擊「刷新」按鈕，從一副52張牌的牌組中顯示四張隨機牌，如圖15.26a所示。（請參考程式設計練習14.3中的提示，了解如何獲取四張隨機牌。）
### 使用 GridPane 布局管理器

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class test1 extends Application {
    @Override
    public void start(Stage primaryStage) {
        GridPane gridPane = new GridPane();
        gridPane.setHgap(10);
        gridPane.setVgap(10);

        Button button1 = new Button("Button 1");
        Button button2 = new Button("Button 2");
        gridPane.add(button1, 0, 0); // 第一列第一行
        gridPane.add(button2, 1, 0); // 第一列第二行

        Scene scene = new Scene(gridPane, 300, 200);
        primaryStage.setTitle("GridPane Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

### 隨機數與 ArrayList 操作

import java.util.ArrayList;
import java.util.Collections;

public class test2 {
    public static void main(String[] args) {
        ArrayList<Integer> cards = new ArrayList<>();
        for (int i = 1; i <= 52; i++) {
            cards.add(i);
        }

        Collections.shuffle(cards);

        System.out.println("Shuffled cards: " + cards.subList(0, 4)); // 顯示前 4 張
    }
}

### 圖片的載入與顯示

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class test3 extends Application {
    @Override
    public void start(Stage primaryStage) {
        Image image = new Image(getClass().getResourceAsStream("/image/card/1.png"));
        //Image image = new Image(getClass().getResourceAsStream("/image/card/"+某個參數+".png"));
        ImageView imageView = new ImageView(image);
        imageView.setFitWidth(100);
        imageView.setFitHeight(150);

        StackPane root = new StackPane(imageView);
        Scene scene = new Scene(root, 300, 200);
        primaryStage.setTitle("Image Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

### 按鈕的動作事件

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class test4 extends Application {
    @Override
    public void start(Stage primaryStage) {
        Button button = new Button("Click Me");
        button.setOnAction(e -> System.out.println("Button Clicked!"));

        StackPane root = new StackPane(button);
        Scene scene = new Scene(root, 300, 200);
        primaryStage.setTitle("Button Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

---
## HW8_2 (15.3)
編寫一個程式，可以在面板中移動球。你應該定義一個面板類來顯示球，並提供將球向左、向右、向上和向下移動的方法，如圖15.26c所示。檢查邊界以防止球完全移出視野。
 

### 按鈕與事件處理

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

public class test extends Application {
    @Override
    public void start(Stage primaryStage) {
        Pane pane = new Pane();
        Circle circle = new Circle(100, 75, 20);
        circle.setFill(Color.LIGHTCORAL);
        pane.getChildren().add(circle);

        Button btnUp = new Button("Up");
        btnUp.setOnAction(e -> circle.setCenterY(circle.getCenterY() - 10));

        BorderPane borderPane = new BorderPane();
        borderPane.setCenter(pane);
        borderPane.setBottom(btnUp);

        Scene scene = new Scene(borderPane, 300, 200);
        primaryStage.setTitle("Move Circle");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

---
## HW8_3 (15.4)
編寫一個程式來執行加法、減法、乘法和除法運算，如圖15.27a所示。
### TextField 與 Label

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.scene.control.Button;

public class test extends Application {
    @Override
    public void start(Stage primaryStage) {
        TextField textField = new TextField();
        Label label = new Label("Enter something:");
        Button button = new Button("Click me");

        button.setOnAction(e -> label.setText("You entered: " + textField.getText()));

        VBox vbox = new VBox(10, label, textField, button);
        Scene scene = new Scene(vbox, 300, 200);
        primaryStage.setTitle("TextField Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

---
## HW8_4
    

### 隨機數生成

import java.util.Random;

public class test {
    public static void main(String[] args) {
        Random random = new Random();
        int num = random.nextInt(20); // 生成 0 到 19 的隨機數
        System.out.println("Generated number: " + num);
    }
}

### 遊戲狀態管理

private boolean gameStarted = false;

private void test() {
    if (!gameStarted) {
        gameStarted = true;
        System.out.println("Game started!");
    } else {
        System.out.println("Game already started!");
    }
}

### 錯誤處理與輸入驗證

try {
    int guess = Integer.parseInt(txtInput.getText());
    // 判斷邏輯
} catch (NumberFormatException ex) {
    lblMessage.setText("請輸入有效的數字");
    lblMessage.setTextFill(Color.BLACK);
}

---
## run.java

import javafx.application.Application;

public class run {
    public static void main(String[] args) { 
        test.main(args);
    }
}