What are accessors and mutator method in java?

Answer 1

An accessor is a method that accesses the contents of an object but does not modify that object. In the simplest case, an accessor just returns the value of one of the fields. In general, an accessor performs some computation using the fields as long as that computation does not modify any of the fields. Mutators

A mutator is a method that can modify an object. In the simplest case, a mutator just assigns a new value to one of the fields. In general, a mutator performs some computation and modifies any number of fields. Sometimes, accessors are called 'getter' methods and mutators are called 'setter' methods.

Answer 2

One of the techniques in object-oriented programming is encapsulation. It concerns the hiding of data in a class and making them available only through its methods. In this way the chance of making accidental mistakes in changing values is minimized. Java allows you to control access to classes, methods, and fields via so-called access modifiers. The access to classes, constructors, methods and fields are regulated using access modifiers i.e. a class can control what information or data can be accessible by other classes. To take advantage of encapsulation, you should minimize access whenever possible.

Java provides a number of access modifiers to help you set the level of access you want for classes as well as the fields, methods and constructors in your classes. A member has package or default accessibility when no accessibility modifier is specified.

Access Modifiers

1. Private

2. Protected

3. Default

4. Public

Public is the most liberal access modifier and Private is the most restrictive access modifier.

Note: there is no such thing as an 'access specifier' in Java, only access modifiers.

Answer 3

accessor method returns value,where as mutator method doesnot return any value.

for example:

setPriority() method is mutator method ,this method present in Thread class from java.lang package

getPriority() method is accesor the method,this method also present in Thread class from java.lang package

by using setPriority() method,we can set the name to thread.

by using getPriority() method,we can retrive the name to thread

Answer 4

private, public, protected, and the default access.

Answer 5

Getter methods are accessor methods.