Briefly explain how to create instance variables, and show how to define a private integer instance variable called idNumber within a class called Employee.

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When you create a class, you declare the class's instance variables, which are its attributes or fields, within the curly braces using the same syntax you use to declare other variables-you provide a type and an identifier. For example, within an Employee class, you might declare an integer ID number. Then, when you create Employee objects, each will have its own idNumber. The definition of this instance variable is shown below:
class Employee
{
private int idNumber;
}