我使用ACM 图形库创建了 Atari Breakout 游戏的克隆,并刚刚添加了高分界面和功能。玩家的名字和分数应该会显示在 GUI 窗口上(它是成功的),并且会被写入一个.dat
二进制文件。
但是,当代码尝试加载现有文件时,出现以下错误。
writing aborted; java.io.NotSerializableException: acm.graphics.GCanvasListener
我在网上研究了这个错误,似乎可以通过编辑类来Serializable
解决它。但是,抛出此错误的类不是我自己的,而是属于第三方 ACM 图形库的类。我该如何解决这个问题?
我什至不确定为什么首先会导致此错误,因为我尝试序列化的数据只是一个名称和分数,我没有尝试序列化对象画布或类似的东西。
主类(称为 Breakout)
public class Breakout extends GraphicsProgram {
... // game variables
public void run() {
... // this if clause runs when game ends
if (brickCounter > 0) {
removeAll(); // clears screen
printGameOver(); // displays game over message
HighscoreManager hm = new HighscoreManager();
String name = getHighScoreName();
hm.addScore(name, score);
hm.displayHighscores();
}
}
... // game functionality methods
private String getHighScoreName(){
IODialog dialog = new IODialog();
String name = dialog.readLine("Enter your name: ");
return name;
}
成绩等级
private class Score implements Serializable {
private int score;
private String name;
public Score(String name, int score) {
this.score = score;
this.name = name;
}
public int getScore() { return score; }
public String getName() { return name; }
}
分数比较器类
private class ScoreComparator implements Comparator<Score> {
public int compare(Score score1, Score score2) {
int sc1 = score1.getScore();
int sc2 = score2.getScore();
if (sc1 > sc2) {
return -1;
} else if (sc1 < sc2) {
return 1;
} else {
return 0;
}
}
}
HighscoreManager 类
private class HighscoreManager {
private ArrayList<Score> scores;
private static final String HIGHSCORE_FILE = ".//bin//scores.dat";
ObjectOutputStream outputStream = null;
ObjectInputStream inputStream = null;
public HighscoreManager() {
scores = new ArrayList<Score>(10);
}
public ArrayList<Score> getScores() {
loadScoreFile();
sort();
return scores;
}
private void sort() {
ScoreComparator comparator = new ScoreComparator();
Collections.sort(scores, comparator);
}
public void addScore(String name, int score) {
loadScoreFile();
scores.add(new Score(name, score));
updateScoreFile();
}
public void loadScoreFile() {
try {
inputStream = new ObjectInputStream(new FileInputStream(HIGHSCORE_FILE));
scores = (ArrayList<Score>) inputStream.readObject();
}
catch (FileNotFoundException e) {
System.out.println("[Load] File Not Found Error: " + e.getMessage());
}
catch (IOException e) {
System.out.println("[Load] Input/Output Error: " + e.getMessage());
}
catch (ClassNotFoundException e) {
throw new RuntimeException("[Load] Class Not Found Error: " + e.getMessage());
}
finally {
try {
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
} catch (IOException e) {
System.out.println("[Load] Input/Output Error: " + e.getMessage());
}
}
}
public void updateScoreFile() {
try {
outputStream = new ObjectOutputStream(new FileOutputStream(HIGHSCORE_FILE));
outputStream.writeObject(scores);
}
catch (FileNotFoundException e) {
System.out.println("[Update] File Not Found Error: " + e.getMessage());
}
catch (IOException e) {
System.out.println("[Update] Input/Output Error: " + e.getMessage());
}
finally {
try {
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
} catch (IOException e) {
System.out.println("[Update] Input/Output Error: " + e.getMessage());
}
}
}
public void displayHighscores() {
int max = 10;
ArrayList<Score> scores;
scores = getScores();
int x = scores.size();
if (x > max) {
x = max;
}
removeAll(); // clears screen
int npos = 160;
int spos = 160;
for (int i = 0; i < x; i++) {
GLabel showName = new GLabel(scores.get(i).getName(), (getWidth() / 2.0) - 100, (getHeight() / 2.0) - npos);
showName.move(-showName.getWidth() / 2, -showName.getHeight());
showName.setColor(Color.WHITE);
add(showName);
npos -= 40;
}
for (int i = 0; i < x; i++) {
GLabel showScore = new GLabel(Integer.toString(scores.get(i).getScore()), (getWidth() / 2.0) + 100, (getHeight() / 2.0) - spos);
showScore.move(-showScore.getWidth() / 2, -showScore.getHeight());
showScore.setColor(Color.WHITE);
add(showScore);
spos -= 40;
}
}
运行应用程序后:
[Load] Input/Output Error: writing aborted; java.io.NotSerializableException: acm.graphics.GCanvasListener
[Update] Input/Output Error: acm.graphics.GCanvasListener
[Load] Input/Output Error: writing aborted; java.io.NotSerializableException: acm.graphics.GCanvasListener