Very detailed android serialization process Parcelable

public class Entry implements Parcelable{
public int userID;
public String username;
public boolean isMale;
public Book book;//Serialized objects can be nested with serialized objects, provided that both objects of the classes have been serialized by the serial number//Return 0 in almost all cases, you can ignore it@Override
public int describeContents() {
return 0;
}
//Serialize the object and write the object into the serial number data structure//flags: Most of the cases are 0@Override
public void writeToParcel(Parcel out, int flags) {
(userID);
(username);
(isMale ? 1:0);
(book, 0);
// (list); It can also have serial numbers list and map, provided that the data in the list and map are serial numbers// (Map);
}
public Entry(int userID,String username,boolean isMale) {
 = userID;
 = username;
 = isMale;
}
//Deserializationpublic static final <Entry> CREATOR = new Creator<Entry>() {
//Create an array of original objects of a specified length@Override
public Entry[] newArray(int size) {
// TODO Auto-generated method stub
return new Entry[size];
}
//Create the original object from the object with the serial number@Override
public Entry createFromParcel(Parcel source) {
// TODO Auto-generated method stub
return new Entry(source);
}
};
//Create the original object from the object after the sequence numberprivate Entry(Parcel in){
userID = ();
username = ();
isMale = () == 1;
(().getContextClassLoader());
}

}