What is immutable object? Can you write immutable object?

Question

Object Persistence as Non-Serializable
Assume that the Java programming languae does not have the serializable feature (or you want to mimic
the serializable feature manually).
Discuss the approach where you will need to write the object's state (the values of all member feilds of an
object) to a textfile.
State all possible cases where the manual approach will have pitfalls(at some instance, the manual
approach may either potentially fail or certainly will fail).

Answer 1

Immutable Objects are those objects whose state can not be changed once they are created, for example the String class is an immutable class. Immutable objects can not be modified so they are also thread safe in concurrent execution. Features of immutable classes: simple to construct.