) Is it necessary to use word this in method setName?

In the context of programming, when writing a method like `setName`, typically you wouldn't explicitly use "this" as an argument or parameter since "this" is already implied in most cases. The "this" keyword refers to the current object instance and is often used within the method to access its own properties or modify them.

A simple example of a setter method for a name property might look like:

public class Person {
    private String name;

    public void setName(String newName) {
        name = newName;
    }
}

// In this case, "this.name" would be used internally to set the value of the name property
person.setName("John Doe");

Here, "newName" acts as the input parameter that sets the `name` attribute of the current `Person` object.

So, in short, no, "this" is not needed as an argument when defining the `setName` method unless there's a specific reason to do so (e.g., passing a reference to another `this` instance).