Global Variables

Question:
One of the things left out of Java that we had in C++ wasglobal variables. Is there a way to use global variables in Java?

Answer:
Even though Java requires that all variables and functions must bedeclared within the scope of a class, it is possible to have globalvariables. Think of System.in and System.out for example. They are globalvariables accessible to all parts of an application. You canimplement global variables in a Java application by declaring them asstatic members of a class. For an application it will sometimes makesense to declare an ApplicationGlobals class that only containspublic static variables and methods intended for use throughout the entireapplication.

More often than not, however, the aggregation of globalsinto a single class can be avoided. As your application evolves, youwill often find that global variables are a source of problems whenadding new functionality. It is often possible to provide globallyaccessible instances of objects through default factory methods, suchas java.awt.Toolkit.getDefaultToolkit(). It can also be a good ideato use synchronized set and get methods to access the global data inorder to avoid potential conflicts between threads modifying publicvariables.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS