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我的程序應該在按下按鈕時使圖像可見（rbutton1），並且我應該使用setVisible(true)，但我無法爲rbutton1工作制作事件處理程序。如何使用.setVisible（）方法？
方法public static ArrayList<Piece> read(String fileName)讀取二進制文件。
package project4;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.RadioButton;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Pane;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;
public class Project4 extends Application {
Body b;
Head head1, head2;
Hat hat1, hat2;
Weapon w1, w2, w3;
Companion c1, c2, c3;
@Override
public void start(Stage primaryStage) {
//fetch objects
ArrayList<Piece> pieces = read("pieces.dat");
//parent pane, one row only,
//contains Pane int he left column for images, and a grid pane in the right for controls
GridPane root = new GridPane();
//pane for images
Pane granny = new Pane();
root.add(granny, 0, 0);
//load images
for (Piece p : pieces) {
//only the body starts visible
if (p instanceof Body) {
granny.getChildren().add(((Body) p).image);
b = (Body) p;
} //everything else is added in the right place but is made invisible
else if (p instanceof Head) {
granny.getChildren().add(((Head) p).image);
if (head1 == null) {
head1 = (Head) p;
} else {
head2 = (Head) p;
}
} else if (p instanceof Hat) {
granny.getChildren().add(((Hat) p).image);
if (hat1 == null) {
hat1 = (Hat) p;
} else {
hat2 = (Hat) p;
}
} else if (p instanceof Weapon) {
granny.getChildren().add(((Weapon) p).image);
if (w1 == null) {
w1 = (Weapon) p;
} else if (w2 == null) {
w2 = (Weapon) p;
} else {
w3 = (Weapon) p;
}
} else if (p instanceof Companion) {
granny.getChildren().add(((Companion) p).image);
if (c1 == null) {
c1 = (Companion) p;
} else if (c2 == null) {
c2 = (Companion) p;
} else {
c3 = (Companion) p;
}
}
}
//controls pane
GridPane controls = new GridPane();
controls.setAlignment(Pos.TOP_CENTER);
controls.setPadding(new Insets(10, 10, 10, 10));
controls.setHgap(15);
controls.setVgap(15);
Label headLabel = new Label("Choose Head:");
RadioButton rbutton1 = new RadioButton("Esme with bees");
CheckBox check1 = new CheckBox("Face the other way");
RadioButton rbutton2 = new RadioButton("Esme normal");
CheckBox check2 = new CheckBox("Face the other way");
Label hatLabel = new Label("Choose Hat:");
RadioButton rbutton3 = new RadioButton("Disreputable hat");
RadioButton rbutton4 = new RadioButton("Hat with pins");
RadioButton rbutton5 = new RadioButton("No hat");
Label weaponLabel = new Label("Weapon:");
ComboBox< String> cbox = new ComboBox<>();
cbox.getItems().addAll(
"broom",
"scythe",
"stick"
);
Label companionLabel = new Label("Companion:");
ListView<String> clv = new ListView<>();
clv.getItems().addAll("DEATH of Rats", "Gaspode", "Luggage");
clv.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
clv.setPrefSize(2, 90);
Button exportButton = new Button("Export Character");
Label exportFileName = new Label("export.oscar.dat");
ToggleGroup group = new ToggleGroup();
rbutton1.setToggleGroup(group);
rbutton2.setToggleGroup(group);
ToggleGroup group2 = new ToggleGroup();
rbutton3.setToggleGroup(group2);
rbutton4.setToggleGroup(group2);
rbutton5.setToggleGroup(group2);
controls.add(headLabel, 1, 5);
controls.add(rbutton1, 2, 6);
controls.add(check1, 3, 6);
controls.add(rbutton2, 2, 7);
controls.add(check2, 3, 7);
controls.add(hatLabel, 1, 8);
controls.add(rbutton3, 2, 9);
controls.add(rbutton4, 2, 10);
controls.add(rbutton5, 2, 11);
controls.add(weaponLabel, 1, 13);
controls.add(cbox, 2, 14);
controls.add(companionLabel, 1, 15);
controls.add(clv, 2, 16);
controls.add(exportButton, 2, 17);
controls.add(exportFileName, 3, 17);
rbutton1.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
}
});
root.add(controls, 1, 0);
Scene scene = new Scene(root, 900, 700);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
/* read the file - Binary I/O
* input - String fileName
* returns ArrayList<Piece> of objects
*/
public static ArrayList<Piece> read(String fileName) {
ArrayList<Piece> pieces = new ArrayList<>();
//try with resources
try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName))) {;
//flag should keep reading
boolean go = true;
//if the flag still gives the go ahead
while(go) {
//try to read
try{
//read, set the image dimensions and position, add to arraylist
Piece p = (Piece)in.readObject();
p.setImage();
pieces.add(p);
//if there is no more left to read, an IO exception will be thrown
} catch(IOException ex) {
//set the flag to signal end of file
go = false;
}
}
//neede dexception catches for this type of stream
} catch(IOException ioex) {
System.out.println("Input file is missing. " + ioex.getMessage());
System.exit(-1);
} catch (ClassNotFoundException cnfex) {
System.out.println("Incompatible class. ");
System.exit(-1);
}
//return the list with objects from the file
return pieces;
}