Static Attributes

Estimated time to read: 1 minute

Overview

Attributes, including method attributes, can be set up so that they have only one value across all instances in the the same system. These variables are created with the keyword static.

static int maxSpeed = 65;

If one Car object changes the value of maxSpeed, all other Car objects will also take on the new value.

This essentially creates a variable that can be shared by all objects of the same type.

Declaring Constants / Finals

Declaring an attribute to be final mans that its value cannot be changed once assigned a value.

The example below creates a publicly accessible, static / shared across the class, constant / final, integer named MAX_SPEED with the value of 65.

public static final int MAX_SPEED = 65;

Note

constant / final is written in UPPER_CASE.