ObjectInput stream ObjectOutput stream FileInputstream fileInputstream new FileInputstream (file) ObjectInputstream objInputstream new ObjectInput Stream(fileInputstream)i while (fileinputstream available()>0)t list. add((User) objInputstream readobject ()) objInputstream. close()iObjectInputStream、ObjectOutputStream FileInputStream fileInputStream = new FileInputStream(file); ObjectInputStream objInputStream = new ObjectInputStream(fileInputStream); while(fileInputStream.available() > 0) { list.add((User) objInputStream.readObject()); } objInputStream.close();