<分区>
我有很多 Java 类，但这是我第一次尝试序列化任何东西。我制作了自己的类(class)，其中包括一个数组列表。主要对象是这些类的数组列表。我相信我做的一切都是正确的，但是当我读回它时，arraylist 总是空的。
主要(主要是测试)类:
import java.io.*;
import java.util.ArrayList;
public class IOTest {
public static void main(String[] args) {
ArrayList<Info> master = new ArrayList <Info>();
Info a = new Info("a");
Info b = new Info("a");
Info c = new Info("a");
master.add(a);
master.add(b);
master.add(c);
print(master);
save(master);
ArrayList<Info> loaded = new ArrayList <Info>();
load(loaded);
System.out.println("Loaded List:");
System.out.println("Loaded Size:" + loaded.size());
print(loaded);
}
public static void save(ArrayList a){
File f = new File("savefile.dat");
try {
FileOutputStream fos = new FileOutputStream(f);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(a);
fos.flush();
fos.close();
} catch (IOException ioe) {
System.out.println("Failed to save");
};
}
public static void load(ArrayList a){
File f = new File("savefile.dat");
try {
FileInputStream fis = new FileInputStream(f);
ObjectInputStream ois = new ObjectInputStream(fis);
try {
a = (ArrayList<Info>) ois.readObject();
} catch (ClassNotFoundException cnfe) {
System.out.println("Failed to load");
}
fis.close();
} catch (IOException ioe) {
System.out.println("Failed to load");
}
}
public static void print(ArrayList a){
System.out.println(a);
}
}
自定义数据结构:
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
public class Info implements Serializable {
private static final long serialVersionUID = -5781559849007353596L;
ArrayList<String> list;
public Info( String e) {
list = new ArrayList<String>();
list.add(e);
}
@Override
public String toString() {
return list.toString();
}
private void readObject(ObjectInputStream aInputStream) throws ClassNotFoundException, IOException {
aInputStream.defaultReadObject();
}
private void writeObject(ObjectOutputStream aOutputStream) throws IOException {
aOutputStream.defaultWriteObject();
}
}
如果有人能指出我做错了什么，我将不胜感激。