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Our agents will determine if the content reported is inappropriate or not based on the guidelines provided and will then take action where needed. Thank you for notifying us. The page you are attempting to access contains content that is not intended for underage readers. This item has not been rated yet. Lack of good understanding in the core essentials can be a speed breaker to your career advancement.
If you have a java interview coming up in a few days or you want to impress your peers and superiors with your technical strengths during code review sessions, team meetings, and stand-ups, and concerned about how to make a good impression?
You don't need to worry if you are familiar with the fundamentals. How can I use this format? Lulu Sales Rank: Log in to rate this item. You must be logged in to post a review. Please log in. There are no reviews for the current version of this product Refreshing There are no reviews for previous versions of this product.
First Name. Last Name. Additional Comments. Moderation of Questionable Content Thank you for your interest in helping us moderate questionable content on Lulu. How does this content violate the Lulu Membership Agreement? It looks like Java 7 will have closures. Closures can make your life as a developer much easier. Not sure of the actual syntax for Closures at this stage, but it could be something like: For example, to run a function in a thread pool, myThreadPool.
Currently up to Java 6 , custom sorting of objects in a list requires an implementation of a Comparator interface. Closure could simplify this as follows to sort strings in a list by its length in an ascending order as shown here: Collections.
When using a closure, you will have access to all the variables in the enclosing i. The concept of "mixins inheritances" are great when you want to refactor common functionality from two classes having different super classes. Currently Java does not have "mixins" like Ruby does.
AOP compliments OO. Using interfaces and annotations or reflection, CGLIB, etc to mix at build time using annotations to generate the mixin code as demonstrated below. You could also fake mixins in Java with the inner classes, but it would be ideal to have true mixins that are easier to use out of the box.
Java Module System: JAR files are hard to distribute, hard to version, and hard to reference in general. Existing JAR format can lead to classpath and class loading problems when: a developer or deployer of a Java application has accidentally made two different versions of a library available to the system. If both versions of the third library use the same class names, there is no way to load both versions of the third library with the same classloader. The Java Module System defines a distribution format and a repos itory for collections of Java code and related resources.
It also defines the discovery, loading, and integrity mechanisms at runtime. It looks like Java 7 will have the Java Module System.
Until then the OSGi can handle all of these nicely. The OSGi Open Services Gateway initiative , which is also known as the dynamic module system for Java, defines an architecture for modular application development. The OSGi imple mentations such as Apache Felix, Equinox, and Knoplerfish allow you to break your 26 application into multiple modules, and thus allow you to better manage the cross dependencies between those modules Add some of the frequently used third party libraries like Apache commons collections, Apache commons lang, and more intuitive and easy to use libraries like Joda-Time to the Java core API Joda-Time may become part of Java SE 7.
You may also think of some of the features in other languages that you liked and keen to have those features added to Java if not already present in Java. For example, multi-line string literal in both Scala and Groovy as shown below is more readable and does not require special escape characters as in Java. Groovy comes to the rescue. In a POGO, if you have an access modifier, it will be treated as a property and if you don't specify an access modifier it will be a normal field.
The following code shows Groovy and Java code working together by using the -j compiler switch to enable the joint compilation. Most of these pitfalls are brought about by the effort to maintain the backward compatibility. Note: Being able to compare strengths and weaknesses of Java with other programming and scripting languages will demonstrate some of the recognizable qualities of good programmers. Good programmers get excited chatting about techno logies, and are passionate about diversifying on the technology stack.
So learn different technologies, frameworks, and tools, and be opinionated about which are better for various scenarios. The Unix environment is very robust, and offers powerful tools to automate tasks.
You might be asked a scenario based question as shown below: Q. Some of the Unix commands like grep, find, awk, sed, etc along with the power of regular expressions can make you more productive. Examples, Recursively delete.
Every copy of source code received from subversion repository has. However, if you want to use or distribute source code, these. When creating a new subversion project or folder based on an existing subversion project, it is imperative that the.
Otherwise you run the risk of corrupting the original subversion project with the newly copied and modified project. Finding files that are 7 days old or finding a file that has not been accessed for 30 days more, and files that are larger than k: 29 Knowing your way around Java find.
Search the log files to see if a particular user logged in. Since plethora of third party jar files are used in commercial applications, it is not uncommon to get an error like, java. QName is loaded by two or more different class loaders, and the versions are not compatible. Q13 Can you give some examples of where you used sed and awk utilities? Can you explain the following Unix command?
How will you list the top 5 largest files or directories? How will you find out the disk free space? Q15 Can you brief on a shell script that you had worked on? OEQ A15 Skipped Exposure to tools, technologies, and frameworks Using the right tools, technologies, and frameworks for the right job can not only make developers more productive, but also can significantly increase the robustness and quality of the applications built.
There are so many free online resources to master the tools if you know what tools to use and when to use them.
Core Java Career Essentials
Tools will not only help you become more productive, but also enable you to impress your superiors and peers by delivering your work on time without compromising on the quality. PF A16 Skipped Q17 What tools do you generally need to get your job done? Q18 What other languages have you used? LF A18 Skipped Q19 How would you go about? How would you go about identifying memory leaks or thread safety issues in an application?
How would you go about gathering requirements, designing, and documenting your applications? How would you go about identifying and fixing any potential transactional issues in your application? How would you go about determining the security requirements for your application? How would you go about describing the software development process you are familiar with?
Documenting your Java applications Good documentation is vital to any software project. As your documentation will be reviewed by your superiors and peers, a good documentation will also make a good impression and can surely help you progress in your career or get your contracts extended.
Q20 What are the different types of documents you refer to while designing or coding your system? Q22 What do you expect to see in a high level or detailed technical specification document? Q23 What do you expect to see in a high level or detailed business requirements document?
OEQ A23 Skipped Q24 What tips do you give to someone who wants to write a technical documentation? A24 Skipped Ensuring code quality. As a software engineer, you should ensure how your users will a have quality experience with the system you build. You must learn not only to think from a technology perspective, but also from a user experience and business objective perspective. No point in building something with a bleeding edge technology, if it does not add real value to your business and their users.
QOS Q25 Do you use test driven development?
CORE JAVA CAREER ESSENTIALS FREE PDF
Gives you a better understanding of what you're going to write. Gets you to clearly think what the inputs are and what the output is. Helps you separate the concerns by getting you to think about the single responsibility principle SRP. Enforces a better test coverage. This gives you the confidence to refactor your code in the future, since you have a good coverage. Q26 What tips do you give someone who is writing the unit testing?
Q27 How will you ensure quality of your design and code? Q29 What are mock objects and when do you use them? COQ A29 Skipped Q30 What development methodologies are you comfortable with? SP A30 Skipped In practice there is. Methods and constructors Recursive functions It is always pass-by-value in Java Class, instance, and local variables This section is mainly for beginner to intermediate level. It also contains useful information for senior level candidates, and worth having a quick browse through, especially if you are required to sit for a basic Java technical test.
Even among experienced profes sionals, there are a breed of developers who know how to get things done by using various frameworks, tools, and googling without fully understanding the fundamentals. Under standing the core Java fundamentals are essential not only from the point of view of passing the technical tests used for screening potential candidates and to perform well in technical job interviews, but also from the point of view of showing off your technical capabilities within limits to your peers and superiors during code review sessions, team meetings, and situations where you were able to resolve an intermittent, critical, or obscure problem more quickly than others as you understand the nitty-gritty details.
It's important to let others know about the good things you are accomplishing.
Don't think that by just working hard that you'll get noticed. You need to let people know, 35 Language Essentials especially your leaders like to know these things because they can't know everything that is going on, so speak up when required to. A little preparation prior to a code review session or an important team meeting that was going to discuss a class loading issue can make a huge difference in making an impact.
Core Java Career Essentials
All you have to do is refresh your memory on the basics. What does the following code do? Can you talk us through the code highlighting some of the key language and design features? Arrays; import java.
HashSet; import java. List; import java. Note that spaces are NOT allowed in identifiers. Identifiers are case-sensitive. This means that age and Age are considered as different identifiers. Identifiers cannot match any of Java's reserved words like for, int, etc or literals like null, true, and false..
Note: true, false, and null might seem like keywords, but they are actually literals; you cannot use them as identifiers in your programs.So, it will not need more times and even days to pose it and also various other books. Copyright Office website, http: The basics described here with examples and sample code can bring success in job interviews, technical tests, code reviews, and performance appraisals by learning to sell yourself more effectively.
Q30 Are 'volatile' and 'const' valid modifiers in Java?
You can't say that a leg is a dog. There is always a variety of tasks and responsibilities to be performed.
I swear, under penalty of perjury, that the information in the notification is accurate and that I am the copyright owner or am authorized to act on behalf of the owner of an exclusive right that is allegedly infringed. COQ package chapter2. OEQ A15 Skipped
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