Java实验五参考答案

1.找错误

btOK.setOnAction(
    new EventHandler<ActionEvent> {
        public void handle
            (ActionEvent e) {
            System.out.println
            (e.getSource()); 
        }
}
); // Something missing here

编程题15.1

import javafx.application.Application;
import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.control.Button;
import javafx.scene.layout.VBox;
import javafx.geometry.*;
import javafx.scene.layout.*;
import javafx.scene.image.*;
import java.util.*;

public class getcards extends Application {
@Override
public void start(Stage primaryStage){
    VBox pane=new VBox(5);
    pane.setPadding(new Insets(5,5,5,5));
    Cardspane cards=new Cardspane();
    pane.getChildren().add(cards);
    Button btRefresh = new Button("Refresh");
    pane.getChildren().add(btRefresh);
    pane.setAlignment(Pos.CENTER);
    VBox.setMargin(btRefresh, new Insets(5,5,5,5));
    btRefresh.setOnAction(e->{cards.refresh();});
    Scene scene=new Scene(pane,400,400);
    primaryStage.setTitle("etcards");
    primaryStage.setScene(scene);
    primaryStage.show();
    }

    public class Cardspane extends HBox{
        private Integer[] cardsNum ={1,2,3,4,5,6,7,8,9
               ,10,11,12,13,14,15,16,17,18,19,120,21,22
               ,23,24,25,26,27,28,29,30,31,32,33,34,35,
               36,37,38,39,40,41,42,43,44,45,46,47,48,49,50
               ,51,52,53,54
        };
        private ArrayList<Integer>list =new ArrayList<>(Arrays.asList(cardsNum));
        private ImageView p1;
        private ImageView p2;
        private ImageView p3;
        private ImageView p4;
        public void CardsPane()
        {
            setSpacing(5);
            Collections.shuffle(list);
            p1=new ImageView("实验五/card/"+Integer.valueOf(list.get(0))+".png");
            p2=new ImageView("实验五/card/"+Integer.valueOf(list.get(1))+".png");
            p3=new ImageView("实验五/card/"+Integer.valueOf(list.get(2))+".png");
            p4=new ImageView("实验五/card/"+Integer.valueOf(list.get(3))+".png");
            super.getChildren().addAll(p1,p2,p3,p4);
        }
　　public void refresh(){
　　　　Collections.shuffle(list);
　　　　super.getChildren().removeAll(p1,p2,p3,p4);
　　　　p1=new ImageView("实验五/card/"+Integer.valueOf(list.get(0))+".png");
　　　　p2=new ImageView("实验五/card/"+Integer.valueOf(list.get(1))+".png");
　　　　p3=new ImageView("实验五/card/"+Integer.valueOf(list.get(2))+".png");
　　　　p4=new ImageView("实验五/card/"+Integer.valueOf(list.get(3))+".png");
　　　　super.getChildren().addAll(p1,p2,p3,p4);
}
    }   

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

编程题15.2

package javaseniorprograme;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

/**
 * 15.2 (旋转一个四边形）
 * @author ASUS
 */
public class Exercise15_02 extends Application{
    private double angle = 0;
    @Override
    public void start(Stage primaryStage){
        
        BorderPane root = new BorderPane();
        BorderPane bottom = new BorderPane();
        // 创建一个按钮
        Button btOK = new Button("Rotate");
        // 创建一个矩形
        Rectangle rec = new Rectangle(150, 80);
        // 设置矩形轮廓颜色
        rec.setStroke(Color.BLACK); 
        // 设置矩形填充色
        rec.setFill(Color.WHITE);
        // 按钮事件处理
        btOK.setOnAction((ActionEvent e) -> {
            angle += 15;
            rec.setRotate(angle); 
            System.out.println(e.getSource());
        });
        // 控件布局
        root.setCenter(rec);
        bottom.setCenter(btOK);
        root.setBottom(bottom);
        // 场景
        Scene scene = new Scene(root, 320, 200);
        primaryStage.setTitle("Exercise15_02");
        primaryStage.setScene(scene);
        primaryStage.show(); 
    }
    // 主方法 
    public static void main(String[] args){
        launch(args);
    }
}