Immutable

• We cannot change the value of an object once it is created.
• Declare a class as final so that it cannot be extended.
• All class members should be private. So that direct access can be avoided.
• And class members are initialised only once using constructor.
• All the members of the collections framework are Returned with a deep copy.
• There should not be any setter methods, Which is generally used to change the value.
• Just getter methods And returns, copy of the member variable.
• Example string, Wrapper classes etc.
• Example
• https://github.com/gauravmatta/javacodes/blob/2be6738842c0a29995d184439a567b9b1b7f8da7/PojoClasses/src/javaimplant/immutableclass/ListImmutableClass.java