Java Anti-Patterns. This page collects some bad code that may not look so obviously bad to beginners.
Beginners often struggle with the language syntax. They also have little knowledge about the standard JDK class library and how to make the best use of it. In fact I have collected all examples from everyday junior code. I have modified the original code to give it example character and such that it highlights the problems. 10 Examples of HotSpot JVM Options in Java. There are hundreds of JVM parameters or JVM Options exists inside sun JDK and its virtually impossible to keep track of every single JVM option and based on my experience we don't even use most of JVM flags except couple of important JVM option related to java heap size, java options for printing garbage collection details and most likely JVM switches for setting up remote debugging in Java. but there are many other useful category of JVM parameters which you at least like to be familiar even if not intending to use it more frequently.
In this article we will see examples of 10 different categories of JVM parameter which I found useful and use more frequently than other. I would recommend to get a full knowledge of what does a particular JVM options does by referring official list of JVM options. On the basis of how we specify JVM option it can be divided into two parts, JVM Options which starts with –X and those which starts with -XX: CamelCookbook/camel-cookbook-examples. Undertow · JBoss Community.
Preparation tips for SCJP- Sun Certified Java Programmer Exam | Java, JVM and beyond. I cleared SCJP 6.0 with 81% on January 25, 2010 (putting this up after a long gap), not a really good score, but happy to get a “PASS” :).
I did manage to do some 25 days of preparation (serious preparation), but my coding experience in Java helped me a lot- In understanding the basic concepts easily and giving more time to learn the less used concepts like Generics, Collections, Threading. Through out my preparation and after appearing for the exam there are few things I wanted to share with the aspirants: Which Is the book to be referred? Java Anti-Patterns. This page collects some bad code that may not look so obviously bad to beginners.
Beginners often struggle with the language syntax. They also have little knowledge about the standard JDK class library and how to make the best use of it. The 3 things you should know about hashCode() In Java, every object has a method hashCode that is simple to understand but still it’s sometimes forgotten or misused.
Here are three things to keep in mind to avoid the common pitfalls. An object’s hash code allows algorithms and data structures to put objects into compartments, just like letter types in a printer’s type case. The printer puts all “A” types into the compartment for “A”, and he looks for an “A” only in this one compartment. Java Anti-Patterns. IT Happens Here!: Understanding the Different ApplicationContexts in Spring Application. As a beginner to spring, one might often not know the difference between the several applicationContexts that we use in a spring application.
Spring documentation is the best place that can really guide you though the process of completely getting this clarified! But here is the abridged version for a quick understanding of the differences between the various configuration files that we use in a spring application. Open Source Rule Engines in Java. Drools Go To Drools Mandarax Go To Mandarax.
Vert.x- Effortless asynchronous application development for the modern web and enterprise. Project Lombok. 400+ Java Interview Questions and Answers blog. Java IAQ: Infrequently Answered Questions. By Peter Norvig Q: What is an Infrequently Answered Question?
A question is infrequently answered either because few people know the answer or because it is about an obscure, subtle point (but a point that may be crucial to you). I thought I had invented the term, but it also shows up at the very informative About.com Urban Legends site. Wouter Coekaerts » Puzzles. This is a series of Java puzzles that put your Java skills to the test, in a challenging and fun way!
A puzzle consists of some given Java code with a line in it that seems to be impossible to reach. It’s up to you to find the hole in it, abuse a subtle behavior of Java to make execution reach that line anyways. Rules. [JavaSpecialists 199] - Hacking Java Surreptitiously. The Java Specialists' Newsletter Issue 199 Category: Language Java version: Java 1 - Java 7 by Dr.
Overview. Commons Functor: Function Objects for Java A functor is a function that can be manipulated as an object, or an object representing a single, generic function. Functors support and encourage a number of powerful programming techniques including: programming in a functional style higher order functions internal iterators reuse and specialization through composition rather than inheritance and overloading generic "callback" or "extension point" APIs generic "filters" or predicate APIs many "behavioral" design patterns, such as Visitor, Strategy, Chain of Responsibility, etc.
Top 15 java threading interview questions asked in Investment banks. Thread interview questions Java Multi-threading and concurrency questions are essential part of any Java interview. If you are going for any Java interview on any Investment bank for equities front office position expect lots of muti-threading interview questions on your way. Multi-threading and concurrency is a favorite topics on Investment banking specially on electronic trading development and they grill candidate on many confusing java thread interview questions. Vanilla Java. Clean Code: A Handbook of Agile Software Craftsmanship. Section), Please Wait For 5-8 Second. Then You Can Click On Skip Ads! Button. Clean Code. Whew! Posted by Uncle Bob on 04/08/2008 I’ve been working on this book for several years now.
After a flurry of effort (you might have noticed I’ve been quiet lately) I’m very pleased to say that I’m done with the writing and am preparing the manuscript for production. See The Prentice Hall Listing Table of Contents Clean Code 1 There Will Be Code 1 Bad Code 2 The Total Cost of Owning a Mess. 3 Schools of Thought. 11 We are Authors. 12 The Boy Scout Rule 13 Prequel and Principles 14 Conclusion 14 Bibliography 15 Meaningful Names by Tim Ottinger 17 Introduction 17 Use Intention-revealing Names 17 Avoid Disinformation 19 Make Meaningful Distinctions 20 Use Pronounceable Names 21 Use Searchable Names 22 Avoid Encodings 23 Avoid Mental Mapping 24 Class Names 25 Method Names 25 Don't Be Cute 25 Pick One Word Per Concept 26 Don't Pun 26 Use Solution Domain Names 27 Use Problem Domain Names 27 Add Meaningful Context 27 Don't add Gratuitous Context 29 Final Words ... 30 Functions 31 Small!
Collections.png (PNG Image, 802x915 pixels) An Introduction to Generics in Java > Generic Methods. Like generic classes, methods and constructors can also have type parameters. These parameters are declared prior to the return type of the method and can be used as return types, argument types, and in the throws clause. For example, see Listing 4. Listing 4 Generic method—finds max T. Factory Chain: A Design Pattern for Factories with Generics by Hugo Troche - developer.*, Developer Dot Star. Java Generics FAQs - Frequently Asked Questions. Domain-Driven Design Community. Roma Framework: The new way to conceive Web Applications. An Introduction to Domain Driven Design. Desarrollo Aplicaciones Web. DDD Sample Application - Introduction. Javashot - Project Hosting on Google Code. GEF.
m2eclipse FAQ | Sonatype. Singleton in Java – the proper way « The guy who does not speak… Efficient way to implement singleton pattern in Java. Www.qi4j.org - www.qi4j.org. Neo4j open source nosql graph database » TinkerPop.