Saving Data on Android

Serialized
 when written to the file.
Serializable
Serializable
 is a standard Java tagging interface. This interface has no operation but 
it can be used to define the corresponding type as serializable. An object is 
serializable when it can be converted into an array of bytes and vice versa. If an 
object is 
Serializable
 it can also be written into a file or read from a file. 
Serialization is not very easy though. When you restore an object you still need a 
compatible version of the class used during serialization. Implementing the 
Serializable
 interface isn't enough - some properties are implicitly not serializable. 
Some examples are