There are many immutable classes like String, Boolean, Byte, Short, Integer, Long, Float, Double etc. In short, all the wrapper classes and String class is immutable. We can also create immutable class by creating final class that have final data members as the example given below:
In this example, we have created a final class named Employee. It have one final datamember, a parameterized constructor and getter method.
The above class is immutable because:
These points makes this class as immutable.