[Java] What is an accessor method? What is a mutator method? What are the naming conventions for accessor methods and mutator methods

An accessor method is a method used to returns the value of the private member variable. They are also widely known as getter method.
A mutator method is a method used for controlling changes to a variable. Another name of a mutator method is setter.

The naming convention for accessor method is getDataFieldName() for non-boolean values and isDataFieldName() for boolean values, and the naming convention for mutator method is setDataFieldName(value). Here is an example from wiki:

 

Remarks
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Reference:
1) Introduction to Java Programming, Y. Daniel Liang
2) https://en.wikipedia.org/wiki/Mutator_method