public class Test{
public static void main(String args[]){
Store store = new Store();
FileOutputStream fos;
ObjectOutputStream oos = null;
try{
fos = new FileOutputStream(new File("table.obj"));
oos = new ObjectOutputStream(fos);
}catch(IOException e1){
e1.printStackTrace();
}
这继续包含一堆更多的代码,但我认为真正重要的是我的“Q”案例……
case "Q":
System.out.println("Good-Bye!");
try{
oos.writeObject(store);
oos.flush();
oos.close();
}catch(IOException e){
e.printStackTrace();
}
System.exit(0);
break;
当我尝试将所有数据保存到我的.obj文件并关闭流并退出我的程序时,我得到所有这些错误……
java.io.NotSerializableException：Item
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at java.util.Hashtable.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
在Test.main(Test.java:143)
我不确定这些错误大多数意味着什么,或者为什么我会得到它们,甚至不知道如何修复它们.谁能帮我？
编辑：商店类
import java.io.Serializable;
import java.util.Hashtable;
public class Store implements Serializable{
Hashtable<String,Item> stockedItems = new Hashtable<String,Item>();
public boolean addItem(String code){
if(stockedItems.containsKey(code)){
stockedItems.get(code).incrementQuantity();
return true;
}
return false;
}
public boolean removeItem(String code){
if(stockedItems.containsKey(code)){
stockedItems.get(code).decrementQuantity();
return true;
}
return false;
}
public boolean findItem(String code){
if(stockedItems.containsKey(code)){
return true;
}
return false;
}
}
**我的HashTable包含不实现Serializable的Item对象.我现在修复了哪个.程序运行和Q案例工作正常！现在是我的U案不起作用,这里是……
case "U":
try{
FileInputStream fis = new FileInputStream("table.obj");
ObjectInputStream ois = new ObjectInputStream(fis);
store = (Store)ois.readObject();
ois.close();
}catch(IOException | ClassNotFoundException e){
e.printStackTrace();
}
break;
这种情况的目的是允许用户选择是否要使用存储在我的.obj文件中的数据.我试图使用这种情况时得到这些错误
at java.io.ObjectInputStream $BlockDataInputStream.peekByte(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
在Test.main(Test.java:142)
解决方法
UPDATE
根据您更新的问题,看起来Item类也需要实现Serializable.实际上,这正是异常的第一行所说的：
java.io.NotSerializableException: Item
