Although they look similar, there is a massive difference between both.
>> operator does the job of right shifting the sign bits
>>> operator is used in shifting out the zero-filled bits
Delete Function is faster in linked lists as the user needs to make a minor update to the pointer value so that the node can point to the next successor in the list.
A minimal set of plugins that you need to build a rich client application is known as the Rich Client Platform.
Creating a sample application Eclipse IDE needs only two plugins like ‘org.eclipse.ui’ and ‘org.eclipse.core.runtime’.
Projects created in Eclipse IDE have zero or more ‘builders’ associated with it. A builder is responsible for compiling the source code and generating classes for the associated project. A Java project is associated with a java builder.
While creating a project using some IDE we may add ‘class’ files, create a model for the project and create an XML schema for the same. If we have a better modeling framework, we need to create only one of these entities and the rest of them will get created along. This is done by EMF (Eclipse Modelling Framework).
So, EMF is a set of Eclipse plug-ins, which can be used to model a data model and to generate code from it. This framework is a Java /XML framework.
JDK is an abbreviation for Java Development Kit. It is a combined Package of JRE and Developer tools used for designing Java Applications and Applets. Oracle has the following variants.
JDK Standard Edition
JDK Enterprise Edition
JDK Micro Edition
When the main method is not declared as static, then the program may be compiled correctly but ends up with a severe ambiguity and throws a run time error that reads "NoSuchMethodError."
To get right of entry to precise library from a plugin, the library needs to be added to the classpath of a plug-in. There are 4 approaches of doing this. The JAR can be delivered to the boot classpath
The JAR may be introduced to the declared libraries for a plug-in
Create a brand new plug-in that can be delivered to the library
By the use of OSGI discern loader.
In a wealthy purchaser platform,it includes: Eclipse Runtime
JFace
Workbench
SWt
Import-Package’ is used to claim a dependency on a bundle without knowing which actual bundle will provide it
‘Require-Bundle’ specifies your plugin challenge’s dependency on other unique package deal and variations explicitly.
The term final is a predefined word in Java that is used while declaring values to variables. When a value is declared using the final keyword, then the variable's value remains constant throughout the program's execution.
Java Virtual Machine takes care of memory management implicitly. Java's primary motto was to keep programming simple. So, accessing memory directly through pointers is not a recommended action. Hence, pointers are eliminated in Java.
In Java, when you declare primitive datatypes, then Wrapper classes are responsible for converting them into objects(Reference types).
Java is not considered as a 100% object-oriented programming language because it still makes use of eight or more primitive data types like int, float double, etc.
An ability to recreate an object entirely similar to an existing object is known as Object Cloning in Java. Java provides a clone() method to clone a current object offering the same functionality as the original object.
An empty interface in JavaJava is referred to as a Marker interface. Serializable and Cloneable are some famous examples of Marker Interface.
A Copy Constructor in Java is a constructor that initializes an object through another object of the same class.
An Association can be defined as a relationship that has no ownership over another. For example, a person can be associated with multiple banks, and a bank can be related to various people, but no one can own the other.
public class Simplilearn
{
public static void main (String args[])
{
System.out.println(100 + 100 +“Simplilearn");
System.out.println(“E-Learning Company" + 100 + 100);
}
}
The answers for the two print statements are as follows.
* 200Simplilearn
* E-Learning Company100100
Neither the Local Variables nor any primitives and Object references have any default value stored in them.
Yes, the program will successfully execute if written so. Because, in Java, there is no specific rule for the order of specifiers.
There are two complementary ways of depending on something from outside a given plug-in; Require-Bundle and Import-Package.
Eclipse Runtime, SWt, JFace, Workbench
The Eclipse Modeling Framework is a Java/XML framework for generating tools and other applications based on simple class models. EMF helps you rapidly turn models into efficient, correct, and easily customizable Java code. It is intended to provide the benefits of formal modeling, but with a very low cost of entry. In addition to code generation, it provides the ability to save objects as XML documents for interchange with other tools and applications.
plug-in prerequisite elements can be made optional by adding the optional="true" attribute in Manifest file(see below for an example). Marking an import as optional simply states that if the specified plug-in is not found at runtime, the dependent plug-in should be left enabled. This is used when a plug-in can be used in many scenarios or it is reasonable to operate with reduced function. It allows the creation of minimal installs that cover functional subsets. Require-Bundle: org.eclipse.swt; optional="true"
Define a product via the products extension point and specify the windowImages property to refer to two image files, a 16x16 one and a 32x32 one.
To determine if a literal is valid with respect to a simple type, you can use either XSDSimpleTypeDefinition.isValidLiteral or XSDSimpleTypeDefinition.assess.
A layout is only performed automatically on a Composite's children when the Composite is resized, including when it is initially shown. To make a Composite lay out its children under any other circumstances, such as when children are created or disposed, its layout() method must be called.
Application code must explicitly invoke the Image.dispose() method to release the operating system resources managed by each instance when those instances are no longer required. This is because that the Java finalization is too weak to reliably support management of operating system resources.
Define the 'Eclipse-AutoStart=true' header in Manifest file.
SWT implements a single-threaded UI model often called apartment threading. In this model, only the UI-thread can invoke UI operations. SWT strictly enforces this rule. If you try and access an SWT object from outside the UI-thread, you get the exception "org.eclipse.swt.SWTException: Invalid thread access". The following code sets the text of a label from a background thread and waits for the operation to complete: display.syncExec( new Runnable() { public void run(){ label.setText(text); } });
Two ways to implement it in code: generating OS level key event use Display.post(Event) or use Widge.notifyListeners(...) to just notify a widget's listeners.
Loose coupling in Eclipse is achieved partially through the mechanism of extensions and extension points. When a plug-in wants to allow other plug-ins to extend or customize portions of its functionality, it will declare an extension point. The extension point declares a typically a combination of XML markup and Java interfaces, that extensions must conform to. Plug-ins that want to connect to that extension point must implement that contract in their extension.
To access UI objects from a non-ui thread, use command
Display.getDefault().asyncExec(new Runnable()…)
This will cause the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity.
To access particular library from a plugin, the library needs to be added to the classpath of a plug-in. There are four ways of doing this.
<> The JAR can be added to the boot classpath
<> The JAR can be added to the declared libraries for a plug-in
<> Create a new plug-in that can be added to the library
<> By using OSGI parent loader
The classpath of a plugin is “OSGI parent class loaderâ€. In OSGI, all class loaders have a common parent class loader.
In a rich client platform, it includes
1. Eclipse Runtime
2. JFace
3. Workbench
4. SWt
The Shell class represents windows while the Display class represents the GUI process(thread).
1. ‘Import-Package’ is used to declare a dependency on a package without knowing which exact bundle will provide it.
2. ‘Require-Bundle’ specifies your plugin project’s dependency on other specific bundle and versions explicitly.
To hide menu contributed by other plugins, you can use org.eclipse.ui.activities extension.
An eclipse modeling framework is a Java/XML framework. It is used for generating tools and other applications based on simple class models.
To hide menu contributed by other plugins, you can use org.eclipse.ui.activities extension.
Whenever a plug-in wants to allow other plug-ins to extend or customize portions of its functionality, it will declare an extension point.
To generate JavaDoc documentation for your code,
In Eclipse, you have to follow the following steps,
1. Go to File menu
2. Select Export
3. Select Java
4. JavaDoc
5. Choose the projects, other properties and output directory for which JavaDoc is to be created
6. Click Finish
Eclipse IDE is a cross-platform, hence it can be successfully installed and used as a development environment in almost all the operating systems like Windows, Mac, Linux, Solaris, etc.
If you have developed a Java project using Eclipse IDE and added codes to meet the project requirements, then you can find ‘.java’ files in the ‘src’ folder and corresponding ‘.class’ files in the ‘bin’ folder. (When we run a Java Project; ‘.java’ files are compiled to ‘.class’ files).
In Eclipse, you can do following activities,
<> Create generic projects.
<> Edit files in a generic text editor.
<> Share files and project in a CVS (Concurrent Version System) server.
Eclipse is used in several different areas, e.g. as a development platform for Android or Java applications. It is also used for managing and deploying software across the entire software lifecycle.
The key Eclipse projects and technologies are;
<> Eclipse platform
<> Eclipse project
<> JDT or Java Development Tools
<> Plug-in Development Tools (PDE)
A classloader in Java is a subsystem of Java Virtual Machine, dedicated to loading class files when a program is executed; ClassLoader is the first to load the executable file.
Java has Bootstrap, Extension, and Application classloaders.
Eclipse IDE is the most widely used Java development environment. It is also used to develop applications in other programming languages like Python, C#, C++, etc.