Use of Static variables in Java:

Static members are unusual in that they exist without you creating an object of the class. They have a limited number of correct uses. You should not be tempted to use them as a way of avoiding constructing objects. Constants A common use is to define some constant associated with the class. For example, the Java package associated with mathematical processing implements the mathematical constant PI in this way. One value for all objects A second use of class variables and methods is to implement data that has only one value for every object of that class. One common example of this is to keep count of the
number of objects of a class type that have been created. It might lead to errors if each object kept its own version of this count, as each object would have to update the count every time a new object came into existence and it would be easy to forget to update some object's copy of this variable.

Suppose that class User has a public static variable day, recording the day of the week as an integer:

public class User
{
public static int day;
// etc.

}

This could be used to ensure that all objects of the class User record the same value for the day of the week. We can create an object of type User referenced by jane: User jane = new User(); However, to access day it is preferable to write User.day
rather than jane.day, as the latter suggests instance data.  

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