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What modifications should I make in your classes to make them immutable?
In order to create an immutable class, you should follow the below steps: Make your class final, so that no other classes can extend it. Make all your fields final, so that they’re initialized only once inside the constructor and never modified afterward. Don’t expose setter methods.
Can we make a class immutable?
Immutable class in java means that once an object is created, we cannot change its content. In Java, all the wrapper classes (like Integer, Boolean, Byte, Short) and String class is immutable. We can create our own immutable class as well. The class must be declared as final so that child classes can’t be created.
What are the advantages of making a class immutable?
Some of the key benefits of immutable objects are:
- Thread safety.
- Atomicity of failure.
- Absence of hidden side-effects.
- Protection against null reference errors.
- Ease of caching.
- Prevention of identity mutation.
- Avoidance of temporal coupling between methods.
- Support for referential transparency.
Do you need a method to make a class immutable?
It’s immutable, but you do need to implement a few methods to make it work. Immutable persistent (in the functional, not write to desk sense) data structures. Even if you don’t use them as is, the source code should provide some inspiration.
Can a wrapper class be immutable in Java?
In Java, all the wrapper classes (like Integer, Boolean, Byte, Short) and String class is immutable. We can create our own immutable class as well. Following are the requirements: The class must be declared as final (So that child classes can’t be created)
Why is an immutable class good for caching?
An immutable class is good for caching purposes because you don’t have to worry about the value changes. Another benefit of immutable class is that it is inherently thread-safe, so you don’t have to worry about thread safety in case of multi-threaded environment.
How to create immutable class with mutable object references in Java?
Do not provide setter methods (methods that modify fields) for variables, so that it can not be set. Make all mutable fields final so that their values can be assigned only once. Initialize all the fields through a constructor doing the deep copy.