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school hosting school hosting Sometimes, you want to have variables that are common to all objects. This is accomplished with the modifier in their declaration are called . They are associated with the class, rather than with any object. Every instance of the class shares a class variable, which is in one fixed location in memory. Any object can change the value of a class variable, but class variables can also be manipulated without creating an instance of the class.

school hosting For example, suppose you want to create a number of objects and assign each a serial number, beginning with 1 for the first object. This ID number is unique to each object and is therefore an instance variable. At the same time, you need a field to keep track of how many objects have been created so that you know what ID to assign to the next one. Such a field is not related to any individual object, but to the class as a whole. For this you need a class variable, , as follows: public class Bicycle{ private int cadence; private int gear; private int speed; private int id; private int numberOfBicycles = 0; } Class variables are referenced by the class name itself, as in Bicycle.

school hosting numberOfBicycles This makes it clear that they are class variables.  You can also refer to static fields with an object reference like myBike.numberOfBicycles but this is discouraged because it does not make it clear that they are class variables. You can use the instance variable and increment the class variable: public class Bicycle{ private int cadence; private int gear; private int speed; private int id; private static int numberOfBicycles = 0; public Bicycle(int startCadence, int startSpeed, int startGear){ gear = startGear; cadence = startCadence; speed = startSpeed; // increment number of Bicycles and assign ID number id = ++numberOfBicycles; } public int getID() { return id; } } The Java programming language supports static methods as well as static variables. Static methods, which have the modifier in their declarations, should be invoked with the class name, without the need for creating an instance of the class, as in ClassName.

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