[Java] What are the benefits of data field encapsulation

Encapsulation in Java is a mechanism wrapping the variables and code acting on the data (methods) together as as single unit. The variables of a class will be hidden from other classes by using it, and can be accessed only through the methods of their current class. Benefits of data field encapsulation are :

• The data fields of a class can be made read-only or write-only (for protecting data )
• A class can have total control over what is stored in its fields (for easy to maintain the class.)
• The user of a class don't know how the class stores its data. A class can change the data type of a field and users of the class do not need to change any of their code (for protecting data )

Remarks
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Reference:
1) Introduction to Java Programming, Y. Daniel Liang 9.21
2) http://www.tutorialspoint.com/java/java_encapsulation.htm