Codetown ::: a software developer's community
Hello all, I am “very” new to Java and fairly new to programming in general. I have been reading the “Head First Java” book and while doing one of the examples came across an observation. I created a colored circle and a button when you click the button the circle changes to a random color with the repaint() method. I have dual monitors set up and what I noticed was that If I were to drag the window to the second monitor it fires the repaint() method. Can anyone explain why this happens? I know this is probably something as a new programmer I don’t need to know right now but it did intrigue me so I thought I would ask.
Tags:
Codetown is a social network. It's got blogs, forums, groups, personal pages and more! You might think of Codetown as a funky camper van with lots of compartments for your stuff and a great multimedia system, too! Best of all, Codetown has room for all of your friends.
Created by Michael Levin Dec 18, 2008 at 6:56pm. Last updated by Michael Levin May 4, 2018.
Check out the Codetown Jobs group.

George Mao shares a deep dive into evolving a basic web application to a planet-scale, global architecture. He walks through 5 stages of maturity, focusing on adding enterprise-grade security, achieving global high availability and disaster recovery, optimizing content delivery costs with CDNs, and implementing globally consistent persistence using serverless technologies.
By George MaoThis eMag explores architecture through five distinct lenses: the socio-technical forces that invisibly shape our code, the paradox of infrastructure that succeeds by disappearing, the power of distributed intelligence over centralized control, the evolutionary advantage of iteration over revolution, and the pragmatic reality of designing for inevitable complexity.
By InfoQGabriele Columbro, managing director of the Linux Foundation Europe, discusses the differences in the open-source landscape between Europe, China and the US. Stressing that the open-source landscape is the last favorable ground for global innovation in the current geo-political landscape.
By Gabriele Columbro
BellSoft has launched Hardened Images for Java containers, claiming 95% fewer CVEs and 30% resource savings. Built on Alpaquita Linux, the 3-in-1 solution combines runtime optimisation, OS hardening, and CVE remediation. It offers a secure, flexible alternative to Chainguard and Distroless, available now in three tiers.
By Mark Silvester
This week's Java roundup for December 1st, 2025, features news highlighting: JDK 26 in Rampdown Phase One; the formation of the JDK 27 Expert Group; GA releases of TornadoVM 2.0 and Spring gRPC 1.0; a point release of GlassFish 7.1; the December 2025 edition of Open Liberty; the first beta release of JHipster 9.0 and the second release candidate of Hibernate Search 8.2.
By Michael Redlich
© 2025 Created by Michael Levin.
Powered by