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Oracle Java Standard Edition 5
Oracle Java commonplace version Runtime ambiance (often known as JRE SE, Java SE or Java SE Runtime ambiance) is a closed-supply and freely distributed computing device technology that presents an easy approach to run Java courses on any Linux-based working gadget.
Invented by way of sun Microsystems
in the beginning invented by way of sun Microsystems for interactive television, the utility become previously known as Java 2 Platform, typical edition or J2SE. It became later received with the aid of the Oracle enterprise that now actively develops and maintains the supply code.
it is known as Java SE (general version) because the technology is additionally disbursed as a Micro version (ME) and an business version (EE), which are available best for embedded methods/mobile instruments and enterprise computing systems respectively.
allotted as binary programs for all Linux distributions
The task permits users to get pleasure from the entire latest and top-rated Java applied sciences from both the cyber web and Java functions which are continually allotted as JAR information. it is disbursed as binary archives that will also be deployed on any sixty four-bit or 32-bit GNU/Linux distribution.
moreover the regular binary files, Oracle also provides Linux clients with binary applications for all RPM-primarily based Linux distributions, together with crimson Hat business Linux, Fedora, openSUSE and OpenMandriva.
Supported on numerous working methods
The JRE (Java Runtime environment) and JDK (Java building package) platforms are platform-impartial and suitable with many open source and business working techniques, corresponding to Linux, BSD, Solaris, Microsoft home windows and Mac OS X, helping the 64-bit, 32-bit and SPARC architectures.
while the Java Runtime ambiance platform is used simplest for enjoying rich net content and Java courses, the Java development kit platform helps Java developers to create contemporary content material for websites or feature-prosperous purposes that work on numerous systems.
Java building equipment incorporates Java Runtime environment
it's also crucial to grasp that JDK (Java building equipment) consists of the JRE (Java Runtime environment) platform, so that you don’t have to down load them one at a time if your main purpose is to strengthen in Java.
Java-primarily based (JDBC) records connectivity to SaaS, NoSQL, and massive records. down load Now.
Java became at the beginning designed for interactive tv, however it changed into too superior of technology for the cable television industry at the time. The background of Java starts with a team referred to as eco-friendly crew, who initiated this mission to strengthen a language for digital contraptions, reminiscent of set-right bins, televisions, and many others. despite the fact, it turned into acceptable for internet programming. Later, Java changed into incorporated through Netscape.
The main factors for creating Java were basic: we vital a language that changed into effective, transportable, platform-impartial, relaxed, excessive-performance, multithreaded, architecture-neutral, object-oriented, interpreted, and dynamic.
during this fast, competitive world the place Java programming construction has reached the subsequent stage, Java has evolved over the years. With the emergence of AI and ML, Java has shifted its focus in opposition t safety, secure transactions, and fitting an genuine tool for commercial enterprise networks.
Is Java altering?
There are loads of issues adjustments to the Java ecosystem within the closing year. The stewarding of Oracle has delivered enhancements focused on ongoing platform completeness, and Mark Reinhold’s keynote at Oracle Code One made it clear that Java continues to be open and free.
Oracle’s chief architect of the Java platform, Mark Reinhold, reassured the trustworthy that Java is stronger than ever, with an energetic community and entire parity between commercial and open-supply JDKs (Java development Kits). Mark Reinhold observed, "Don’t agonize — Java remains free."
A letter to Java from Matthew McCullough, vice chairman of field capabilities, proves that the maxim “when net companies grow up, they become Java shops,” Reinhold took to the stage for a demo of its new aspects.
Three largest adjustments of the 12 months
Reinhold pointed out that we are splitting the 23-year-old platform into 26 usual modules. To assist builders circulate their platform sooner in areas that are valuable to Java builders, Corba and Java business version (EE) modules that had been a part of the Java standard edition were removed. eventually, Reinhold breaks his silence and explains how the alternative of the multi-12 months liberate model with a quick six-month cadence introduced final year advantages Java developers.
If participation is a measure of fitness, then JDK 11 is thriving. Reinhold talked about, “JDK 11 has had the most outdoor contributions of any unlock we’ve considered.”
5 Myths About Java
Mark Reinhold addressed the true five misconceptions (otherwise referred to as fear, uncertainty, and doubt, or FUD) in regards to the new Java free up mannequin:
feature releases might be disruptive for previous releases — no longer real. Mark Reinhold stated, "The price of innovation has not modified, the fee of innovation distribution is changing."
For doing away with an historic function, it need to be deprecated three years in enhance. “now not proper, for removing a deprecated feature, it requires a creation-ready construct that concerns an appropriate warning at both assemble time or runtime as a result of a working construct, in any case, is the best free up formulation.”
Your guide will end for any non-LTS liberate after six months and less than three years for the LTS unlock. "that's no longer authentic; it depends upon what the non-Oracle individuals of the JDK community make a decision to do. Oracle has a confirmed track list and is already discussing how foremost to support JDK eight and JDK eleven for the lengthy haul.”
Non-lengthy-time period-aid releases are just a further name for a beta. “No, the only change with an LTS liberate is that it has a longer support timeline,” Reinhold pointed out, “you could nevertheless use a non-LTS liberate in creation in case you like, however you’ll ought to update it in six months or find a person to guide it or assist it your self.”
if you hold an rare migrated gadget, that you would be able to ignore non-LTS releases, " Reinhold claims here is additionally not actual, claiming, "in case you check with every function unlock, then you are able to migrate to the next long-time period aid release.”
What do you feel in regards to the new unlock cycle? tell us within the comments under!
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Java common version 6 Programmer certified knowledgeable examination
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particular explanations for suitable/mistaken solutions support you hold close underlying concepts
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three yr license
The Java regular version 6 Programmer certified professional examination is for skilled programmers using the Java platform language. The Oracle certified skilled, Java SE 6 Programmer (previously SCJP) designation demonstrates an figuring out of the primary syntax and structure of the Java programming language an skill to create Java technology functions.
critical examination counsel and aims
enhance declarations, initialization and scoping
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The web component developer certification for Java EE is hotter than other exams. Oracle offers two certifications for web component developers one for Java EE 5 and another one for Java EE 6.
Certifications offered to become JEE Web Component Developer
Oracle Certified Professional, Java EE 5 Web Component Developer. You need to complete 1Z0-858 Java Enterprise Edition 5 Web Component Developer Certified Professional Exam to achieve this certification. This exam tests Servlet and JSP knowldge based on Java EE 5 APIs.
Oracle Certified Expert, Java EE 6 Web Component Developer. You need to complete 1Z0-899 OCE for Java EE 6 Web Component Developer Certified Expert Exam to achieve this certification. This exam tests Servlet and JSP knowldge based on Java EE 6 APIs.
Which Web Component Developer Certification I can choose?
The OCEJWCD certification provides knowledge required to develop Java EE 6 Enterprise applications using JSP and Servlet. This exam covers major improvements in Java EE 6 like web fragments, asynchronous servlet, annotations to create servlet or filter, etc.
Topic 1 - Introduction to Java Servlets
Topic 2 - Introduction to Java Server Pages
Topic 3 - Implementing an MVC Design
Topic 4 - The servlet’s environment
Topic 5 - Container facilities for servlets and JSPs
Topic 6 - More view facilities
Topic 7 - Developing JSP pages
Topic 8 - Developing JSP pages using custom tags
Topic 9 - More Controller facilities
Topic 10 - More options for the Model
Topic 11 - Asynchronous web applications
Topic 12 - Web application security
The OCPJWCD (or SCWCD) certification provides knowledge required to develop Java EE 5 Web applications using JSP and Servlets. You cannot get the advantage of testing your skills in new changes like web fragments, servlet annotations, etc.
Topic 1 - The Servlet Technology Model
Topic 2 - The Structure and Deployment of Web Applications
Topic 3 - The Web Container Model
Topic 4 - Session Management
Topic 5 - Web Application Security
Topic 6 - The JavaServer Pages (JSP) Technology Model
Topic 7 - Building JSP Pages Using the Expression Language (EL)
Topic 8 - Building JSP Pages Using Standard Actions
Topic 9 - Building JSP Pages Using Tag Libraries
Topic 10 - Building a Custom Tag Library
Topic 11 - Java EE Patterns
My recommendation would be to prepare for OCE for Java EE 6 Web Component exam to know the latest Java EE APIs and improvements.
Why OCEJWCD isntead of OCPJWCD?
The answer is simple “to know the latest technology” and most of your clients may upgrade from older versions to latest in few months or so. If you take Java EE 6 web component developer you no need to worry about upgrade exam until Java EE 7 , but if you take OCPJWCD you have to upgrade again to Java EE 6.
Why Java EE 6 Web Component Certified?
There are many benefits about being Java certified, you can validate your knowledge, improve your work efficiency and even you may get higher promotions with better salary. Your project assignment experience may not be enough to learn all JSP and Servlet concepts. So certification adds more value to your profile.
Exam Preparation Tips
This Web Component Developer Exam is designed for having practical knowledge in Servlet and JSP Technologies. Coding is the best way to learn programming skills, so you must work at least developing a small web application using JSP and servlets. Remember to use EL tags covered in exam objectives to understand better.
Certification Exam Study Materials
Oracle’s Java EE 6 Tutorial. Read and workout all examples mentioned here. Those who want to know what is servlet and JSP can start here.
OCEJWCD, Java SE 6 OCE Web Component Certification Training Lab . Software simulator for this certification that comes with study notes and practice questions. I recommend this product for those who have some knowledge in JSP and Servlets.
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Google doesn't include JDK 7 in Android's system requirements, but it's still possible to use this JDK to develop Android apps. However, you need to be aware of three problems that can impact app development. Java expert Jeff Friesen launches a two-part series that introduces you to these problems and presents solutions. Part 1 focuses on JAR library creation and release mode APK signing problems.
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Google doesn't include JDK 7 in Android's system requirements, but you can still use this JDK to develop Android apps. Before doing so, you need to be aware of three problems that are bound to plague you during development. This article begins a two-part series that introduces you to these problems and shows you how to overcome them. Part 1 investigates problems related to JAR library creation and release mode APK signing.
You've created a JAR library whose source code doesn't reference Android-specific APIs, nor does it reference standard Java APIs newer than Java 5, except for the few Java 6 enhancements to Android's version of the java.io.File class (and maybe other Java 6 enhancements that are present in Android). Furthermore, the source code doesn't reference any language features introduced after Java 5.
You decide to incorporate this library into the app that you're building by copying its JAR file into your project's libs directory (which is located underneath the project home directory). You compile the source code and let Android merge the library into the resulting app, and note a successful build. You then install the APK and attempt to run the app, and are greeted with a message that the app has stopped.
To demonstrate this problem, create a UseUtils project. Execute the following command (spread across two lines for readability) to create UseUtils:
android create project -t 2 -p C:\prj\dev\UseUtils -a UseUtils
This command creates a UseUtils project directory whose src subdirectory contains a ca subdirectory, which contains a tutortutor subdirectory, which contains a useutils subdirectory. Furthermore, useutils contains a skeletal UseUtils.java source file. Replace this file's contents with Listing 1.
Listing 1—Toasting startup by presenting a randomly generated integer.
public class UseUtils extends Activity
public void onCreate(Bundle savedInstanceState)
Toast.makeText(this, "Random integer [0, 255]: "+Utils.rnd(256),
Listing 1 declares a UseUtils activity class that imports a Utils class from package ca.tutortutor.utils. UseUtils calls this other class's rnd(int) class method to return a randomly generated integer ranging from 0 through 255. This integer is included in a message that's presented to the user via a toast (a message that's displayed for a short time).
Listing 2 presents the contents of a Utils.java source file that declares the Utils class.
Listing 2—Utils consists of simple utility methods.
public class Utils
public static int rnd(int limit)
// Return random integer between 0 and limit (exclusive).
return (int) (Math.random()*limit);
Listing 2's Utils class is a placeholder for various simple utility methods, such as the int rnd(int limit) method that returns a randomly generated integer between 0 (inclusive) and limit (exclusive). Presumably, other utility classes offering more complex utilities could be added to the ca.tutortutor.utils package in the future.
Complete the following steps to create a utils.jar file:
Create a ca\tutortutor\utils directory hierarchy under the current directory.
Copy a Utils.java source file containing Listing 2 into utils.
From the current directory, execute javac ca/tutortutor/utils/Utils.java to compile this file.
From the current directory, execute jar cf utils.jar ca/tutortutor/utils/*.class to create utils.jar.
Copy utils.jar to the project's libs directory. Then, with UseUtils as the current directory, execute ant debug to build the APK.
Switch to the bin subdirectory, and you should observe a UseUtils-debug.apk file among other files. Assuming that an emulated device for Android 4.1 is running, execute the following command to install this APK file (which is really a ZIP file with an .apk file extension) onto this emulated device:
adb install UseUtils-debug.apk
Switch to the device's app launcher screen and locate the UseUtils icon. Click this icon and you should observe Figure 1's error message.
Figure 1 Android has forced UseUtils to close.
Why has Android closed the app? The following excerpt from the output generated while running Ant's build.xml file hints at the answer:
[dx] trouble processing:
[dx] bad class file magic (cafebabe) or version (0033.0000)
[dx] ...while parsing ca/tutortutor/utils/Utils.class
[dx] ...while processing ca/tutortutor/utils/Utils.class
[dx] 1 warning
Android's dx tool, which converts Java classfiles to their Android equivalent, silently excludes classes that target Java 7 (their classfiles have a major version number of 51 and a minor version number of 0) from the generated classes.dex file. This omission results in a thrown error, which can be viewed by executing adb logcat, whose output appears in Figure 2.
Figure 2 The close is caused by a thrown error.
The Dalvik virtual machine equivalent of Utils.class was not stored in classes.dex, and an attempt to reference this class (at startup) has resulted in a thrown instance of the Dalvik equivalent of the java.lang.NoClassDefFoundError class. You can further prove this cause to yourself by executing the following command from within the bin directory:
The classes.dex file contains Android's Dalvik equivalent of the project's compiled Java classfiles. The dexdump tool processes this file and generates a disassembly. Search this disassembly and you'll not find a reference to the Utils class, because this JDK 7-created class is not present.
To fix this problem, include the -source and -target options when compiling the source code via javac, as follows:
javac -source 1.5 -target 1.5 ca/tutortutor/utils/Utils.java
javac -source 1.6 -target 1.6 ca/tutortutor/utils/Utils.java
Execute either of these commands, and a Java 5- or Java 6-compatible classfile is generated. Furthermore, the dx tool will not exclude the Utils class from classes.dex. For proof, rebuild the project, reinstall UseUtils-debug.apk, and run the app. You should see a screen similar to that shown in Figure 3, with the toast near the bottom.
Figure 3 The Hello World, UseUtils message results from the default res\layout\main.xml file.
Java SE 8 Programmer II
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Java SE 8 significantly changes the way Java Programmers write code. Earning a Java SE 8 Certification gives you the tools to make the most of the new features within Java SE 8.
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Java Class Design
Advanced Java Class Design
Generics and Collections
Lambda Built-in Functional Interfaces
Java Stream API
Exceptions and Assertions
Use Java SE 8 Date/Time API
Java I/O Fundamentals
Java File I/O (NIO.2)
Building Database Applications with JDBC
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