File file = new File("person.txt");
boolean toWrite = false;
boolean toModify = false;
if (file.exists())
{
if (file.length() == 0)
{
toWrite = true;
}
else
{
toModify = true;
}
}
if (toWrite || !file.exists())
{
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(list);
fos.close();
oos.close();
}
else if (toModify)
{
FileInputStream fins = new FileInputStream(file);
ObjectInputStream oins = new ObjectInputStream(fins);
LinkedList<Person> temp = (LinkedList<Person>)oins.readObject();
fins.close();
oins.close();
temp.add(per);
temp.add(per2);
temp.add(per3);
temp.add(per4);
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(temp);
fos.close();
oos.close();
}
FileOutputStream打开一个新文件,并在创建文件时将其删除
FileOutputStream打开一个新文件,并在创建文件时将其删除
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