Packages and interfaces are two of Java's most innovative features. Packages are used to group related classes and avoid naming conflicts by providing a mechanism to partition the class namespace into more manageable chunks. Packages also provide access control, with protected and default members having package-level access. To define a package, the package statement is included at the top of a Java file specifying the package name. Import statements are used to make classes in other packages visible. Packages can be built-in, from the Java API, or user-defined.
Gives You the brief idea about packages in JAVA
By N.V.Raja Sekhar Reddy
www.technolamp.co.in
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Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of parent object. The idea behind inheritance in java is that you can create new classes that are built upon existing classes.
Java abstract class & abstract methods,Abstract class in java
Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.
Gives You the brief idea about packages in JAVA
By N.V.Raja Sekhar Reddy
www.technolamp.co.in
Want more interesting...
Watch and Like us @ https://www.facebook.com/Technolamp.co.in
subscribe videos @ http://www.youtube.com/user/nvrajasekhar
Inheritance in java is a mechanism in which one object acquires all the properties and behaviors of parent object. The idea behind inheritance in java is that you can create new classes that are built upon existing classes.
Java abstract class & abstract methods,Abstract class in java
Abstract classes are classes that contain one or more abstract methods. An abstract method is a method that is declared, but contains no implementation. Abstract classes may not be instantiated, and require subclasses to provide implementations for the abstract methods.
A package allows a developer to group classes (and interfaces) together. These classes will all be related in some way – they might all have to do with a specific application or perform a specific set of tasks.
This presentation includes Inheritance in C++ with the 5 categories of Inheritance. Main part of the presentation is the 1st type of Inheritance i.e SINGLE LEVEL INHERITANCE including the Block Diagram,Example Code & Simple Program with Corresponding output. This slide was created & edited in OFFICE 13.
in this tutorial we will discuss about
exception handling in C#
Exception class
creating user-defined exception
throw keyword
finally keyword
with examples'
Course 102: Lecture 24: Archiving and Compression of Files Ahmed El-Arabawy
This lecture discusses the different commands and utilities used for archiving and compression of files and directories in Linux
Video for this lecture on youtube:
http://www.youtube.com/watch?v=R6ZQ6PJyy28
Check the other Lectures and courses in
http://Linux4EnbeddedSystems.com
or Follow our Facebook Group at
- Facebook: @LinuxforEmbeddedSystems
Lecturer Profile:
Ahmed ElArabawy
- https://www.linkedin.com/in/ahmedelarabawy
This keyword is a reference variable that refer the current object in java.
This keyword can be used for call current class constructor.
http://www.tutorial4us.com/java/java-this-keyword
A package allows a developer to group classes (and interfaces) together. These classes will all be related in some way – they might all have to do with a specific application or perform a specific set of tasks.
This presentation includes Inheritance in C++ with the 5 categories of Inheritance. Main part of the presentation is the 1st type of Inheritance i.e SINGLE LEVEL INHERITANCE including the Block Diagram,Example Code & Simple Program with Corresponding output. This slide was created & edited in OFFICE 13.
in this tutorial we will discuss about
exception handling in C#
Exception class
creating user-defined exception
throw keyword
finally keyword
with examples'
Course 102: Lecture 24: Archiving and Compression of Files Ahmed El-Arabawy
This lecture discusses the different commands and utilities used for archiving and compression of files and directories in Linux
Video for this lecture on youtube:
http://www.youtube.com/watch?v=R6ZQ6PJyy28
Check the other Lectures and courses in
http://Linux4EnbeddedSystems.com
or Follow our Facebook Group at
- Facebook: @LinuxforEmbeddedSystems
Lecturer Profile:
Ahmed ElArabawy
- https://www.linkedin.com/in/ahmedelarabawy
This keyword is a reference variable that refer the current object in java.
This keyword can be used for call current class constructor.
http://www.tutorial4us.com/java/java-this-keyword
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UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
2. 2
Packages and Interfaces
Two of Java’s most innovative features:
packages and interfaces
Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
3. 3
Packages
In general, a unique name had to be used for each class to
avoid name collisions
After a while, without some way to manage the name
space, you could run out of convenient, descriptive names
for individual classes.
Java provides a mechanism for partitioning the class name
space into more manageable chunks. - Package
A package in Java is used to group related classes.
Think of it as a folder in a file directory. We use packages
to avoid name conflicts, and to write a better
maintainable code.
The package is both a naming and a visibility control
mechanism. --- HOW??
Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
4. 4
Uses
Packages are used for:
A Preventing naming conflicts.
For example there can be two classes with name
Employee in two packages,
college.staff.cse.Employee and
college.staff.ee.Employee
Providing controlled access:
protected and default have package level access
control. A protected member is accessible by classes in
the same package and its subclasses. A default member
(without any access specifier) is accessible by classes
in the same package only.
Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
5. 5
Defining a Package
To create a package simply include a package command
as the first statement in a Java source file.
Any classes declared within that file will belong to the
specified package.
The package statement defines a name space in which
classes are stored.
If you omit the package statement, the class names are
put into the default package, which has no name.
Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
6. 6
Defining a Package
C:UsersYour Name>javac -d . Package_Ex.java
C:UsersYour Name>java mypack.Package_Ex
To execute, class name must be qualified with its package name.
Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
7. Defining a Package
This forces the compiler to create the "mypack" package.
The -d keyword specifies the destination for where to
save the class file.
You can use any directory name, like c:/user (windows),
or, if you want to keep the package within the same
directory, you can use the dot sign ".", like in the example
above.
Note: The package name should be written in lower case
to avoid conflict with class names.
7Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
8. Access Protection
Classes and packages are both means of encapsulating and
containing the name space and scope of variables and
methods.
Classes act as containers for data and code.
The class is Java’s smallest unit of abstraction.
Packages act as containers for classes and other
subordinate packages.
Java addresses four categories of visibility for class
members:
Subclasses in the same package
Non-subclasses in the same package
Subclasses in different packages
Classes that are neither in the same package nor subclasses
8Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
9. Access Protection
Public - Anything declared public can be accessed from
anywhere.
Private - Anything declared private cannot be seen outside
of its class.
Package - When a member does not have an explicit
access specification, it is visible to subclasses as well as to
other classes in the same package. - This is the default
access.
Protected - If you want to allow an element to be seen
outside your current package, but only to classes that
subclass your class directly
9Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
11. Access within Same Package
Demo
11Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
12. Access from other Package
Importing Packages
Java includes the import statement to bring certain
classes, or entire packages, into visibility.
Once imported, a class can be referred to directly, using
only its name.
In a Java source file, import statements occur
immediately following the package statement (if it exists)
and before any class definitions.
This is the general form of the import statement:
12Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
13. Access from other Package
pkg1 is the name of a top-level package, and pkg2 is the
name of a subordinate package inside the outer package
separated by a dot (.).
There is no practical limit on the depth of a package
hierarchy.
Finally, you specify either an explicit classname or a star
(*), which indicates that the Java compiler should import
the entire package.
This code fragment shows both forms in use:
13Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
14. Accessing Classes in a Package
Fully Qualified class name:
Example:
java.util.Scanner s=new java.util.Scanner(System.in);
import packagename.classname;
Example: import java.util. Scanner;
or
import packagename.*;
Example: import java.util.*;
Import statement must appear at the top of the file, before
any class declaration.
14Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
15. Info bits!!!!
The star form may increase compilation time—especially if you
import several large packages.
For this reason it is a good idea to explicitly name the classes
that you want to use rather than importing whole packages.
However, the star form has absolutely no effect on the run-time
performance or size of your classes.
All of the standard Java classes included with Java are stored in
a package called java.
The basic language functions are stored in a package inside of
the java package called java.lang.
Normally, you have to import every package or class that you
want to use, but since Java is useless without much of the
functionality in java.lang, it is implicitly imported by the
compiler for all programs.
15Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
16. Package Types
Packages are divided into two categories:
Built-in Packages (packages from the Java API)
User-defined Packages (create your own packages)
Built-in Packages
The Java API is a library of prewritten classes, that are free to use,
included in the Java Development Environment.
The complete list can be found at Oracles website:
https://docs.oracle.com/javase/8/docs/api/.
User-defined Packages
These are the packages that are defined by the user.
To create your own package, you need to understand that Java
uses a file system directory to store them. Just like folders on your
computer
16Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
17. Example Built-in Packages
1) java.lang: Contains language support classes(e.g classed
which defines primitive data types, math operations). This
package is automatically imported.
2) java.io: Contains classed for supporting input / output
operations.
3) java.util: Contains utility classes which implement data
structures like Linked List, Dictionary and support ; for Date /
Time operations.
4) java.applet: Contains classes for creating Applets.
5) java.awt: Contain classes for implementing the components
for graphical user interfaces (like button , ;menus etc).
6) java.net: Contain classes for supporting networking
operations.
17Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
18. Example1-Package
package p1;
public class ClassA
{
public void displayA( )
{
System.out.println(“Class A”);
}
}
import p1.*;
Class testclass
{
public static void main(String str[])
{
ClassA obA=new ClassA();
obA.displayA();
}
}
18Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
19. Example2-Package
package p2;
public class ClassB
{
protected int m =10;
public void displayB()
{
System.out.println(“Class B”);
System.out.println(“m= “+m);
}
}
import p1.*;
import p2.*;
class PackageTest2
{
public static void main(String str[])
{
ClassA obA=new ClassA();
Classb obB=new ClassB();
obA.displayA();
obB.displayB();
}
}
19Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
20. Example 3- Package
import p2.ClassB;
class ClassC extends ClassB
{
int n=20;
void displayC()
{
System.out.println(“Class C”);
System.out.println(“m= “+m);
System.out.println(“n= “+n);
}
}
class PackageTest3
{
public static void main(String args[])
{
ClassC obC = new ClassC();
obC.displayB();
obC.displayC();
}
}
20Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam
21. The End…
21Dr. P. Victer Paul, Indian Institute of Information Technology Kottayam