The UML Observer pattern represents a fundamental software design principle where an object (subject) maintains a list of dependents (observers) that it notifies automatically of any state changes. This behavioral pattern, depicted through specific UML notation in system documentation, decouples subjects from observers to promote flexible, maintainable code architecture. Software engineers frequently implement the Observer pattern in event handling systems, model-view-controller frameworks, and real-time data monitoring applications. The UML diagram for this pattern clearly illustrates the relationships between Subject and Observer interfaces, along with concrete implementations. When documenting systems using UML, precise representation of the Observer pattern helps development teams understand notification flows and class responsibilities. Modern programming languages often include built-in constructs that simplify Observer pattern implementation, though understanding its UML representation remains crucial for system design discussions.
Java Design Patterns: A Hands-On Experience with Real-World Examples
*post by Rita Jardón, images via: Coral at Abu Dabab Reefs, Red Sea, Egypt by Derek Keats, Brain Coral by Ryan Somma, Soft Corals by Matt Kieffer, Coral (Goniopora) by Samuel Chow, Coral Slime by Jason Hollinger, Brain Coral by Steve L. Martin, Coral by Markus Mindaugas Urban, Large coral polyps out at night by Derek Keats, Bubble Coral by Samuel Chow, Brain Coral by Hadley Paul Garland
My saves
Seamless abstract geometric pattern in retro memphis style, fashion 80-90s. It can be used in printing, website backdrop and fabric design.
Products
Abstract ribbon Digital Paper This digital product includes: – 1 digital papers in PNG format without watermark – Size: 12000 x 12000 pixels – Resolution: 300 dpi Please note: This is a digital product, no physical items will be shipped. Product photos are for display purposes only and are not included in the download. The rose gold as seen in this listing will not print as real foil. Thanks for looking 🙂 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * The images can be used for personal or commercial purposes. POD friendly! Commercial use does NOT require an additional license purchase! Hooray! * Images can be used to create any PHYSICAL or PRINTED goods to be sold commercially without attribution or limit. One exception: printed paper using the designs as-is without changes requires an additional license. * Any DIGITAL product using the images must be sold in the form of a flattened, complete design product. You may NOT sell as-is or make other digital design resources such as clipart, digital paper, digital kits, or add-ons. To clarify further: Digital design resources are not allowed. A digital design resource is something that your customer will use to further create with digitally. Finished digital artwork and products are OK. Finished products are ready to be printed or placed on products as-is with no or minimal creativity needed on the part of your customer. If you are unsure if use in your product is ok, please send me a convo. * Do not redistribute, resell, share or copy. Purchase does not transfer copyright. * Due to the nature of the product, there are no returns once the item has been downloaded.
Lenticular photos
Take a traditional quilt pattern and give it a modern spin with this simple and modern quilt pattern. This easy to make half square triangle quilt pattern is beginner friendly and lends itself well to bright colors or large patterns with its big blocks. Pattern includes instructions that make both a crib size and throw size quilt. Skill Level: Beginner, Easy Downloadable PDF Includes written instructions for Crib, Throw, Twin, Full/Queen, and King sizes. Fresh modern design Perfect for newer quilters! Finished Quilt Sizes Crib Size – 39\
PaTTerNs
You’ll craft rounds and rounds with the Circle Pattern Bold Prints Repositionable Rubber Stamps Clings from Hero Arts. There is one square shaped cling repositionable stamp included that has a pattern of overlapping circles. Made in the USA.
Graphics
*post by Victoria Snape, images via: (Top row right and 2nd row right) Pom by Pomegranate, (Top row left, 3rd row right and left ) Sea and stone studio, (Bottom row left) Oriba Shibori- S.Fennell
Patterns
Our Combed Cotton is a lightweight cloth that is easy to work with. This versatile fabric is perfect for sewing projects including quilting and appliqué. Content: 100% cotton Thread count: 210 inches (82cm) Width: 56” Stretch: None Weight: 3.82 oz per square yard Shrinkage: \u003c 1% Suitable for: Quilting, appliqué, and crafts Care Instructions: Machine Wash Separately, Cold Water, Gentle Cycle, No Bleach, Tumble Dry Low Heat, Cool Iron Print Technique: A direct print process that uses colorfast, pigment inks. Our state-of-the-art finishing process produces beautiful fabric prints with great clarity and a soft finish that will not fade over time or in the wash. Inspiration is at the heart of every DIY project. Whether you are creating a beautiful quilt, refreshing your home décor, or making crafts, our custom fabrics are uniquely designed to inspire you. Our high quality fabrics are fully customizable and printed on demand with eco-friendly inks, creating fabrics that are ‘sew’ perfect for any project. Select from 7 fabric types; learn more about each fabric type here Available as swatches, fat quarters, or by the yard Fabric widths vary by fabric type. See details of each fabric type below Fabrics by the yard print on 10 continuous yards All Zazzle fabrics are Consumer Product Safety Improvement Act (CPSIA) compliant Eco-friendly fabrics, printed with water-based inks. Contain no added chemicals or toxins Not suitable for children’s sleepwear or crib use Amount of selvage on each piece of fabric will vary Printed in U.S.A.
