it covers the following topics:
Java Evolution
Overview
Constants, variables & data types
Operators and expressions
Decision making and branching
Decision making and looping
Classes, objects & methods
Arrays, Strings and Vectors
Interface
Packages
Multi-threading
Managing errors and exceptions
Applet programming
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.
This slide set covers some Java tidbits you might not encounter on your day-to-day java development.
Perhaps some of them will improve your coding and save you some debugging!
it covers the following topics:
Java Evolution
Overview
Constants, variables & data types
Operators and expressions
Decision making and branching
Decision making and looping
Classes, objects & methods
Arrays, Strings and Vectors
Interface
Packages
Multi-threading
Managing errors and exceptions
Applet programming
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.
This slide set covers some Java tidbits you might not encounter on your day-to-day java development.
Perhaps some of them will improve your coding and save you some debugging!
An exception is a problem that arises during the time of execution of program. An exception can occur for many different reasons, including the following.
A user has enter invalid data.
A file that needs to be opened cannot be found.
A network connection has been lost in the middle of communicatons,or the JVM has run out of memory.
Some of these exception are caused by user error, others by programmer error, and others by physical resources, that have failed in some manner.
Java - Exceptions. An exception (or exceptional event) is a problem that arises during the execution of a program. When an Exception occurs the normal flow of the program is disrupted and the program/Application terminates abnormally, which is not recommended, therefore, these exceptions are to be handled.
Exception is an error event that can happen during the execution of a program and disrupts its normal flow. Java provides a robust and object oriented way to handle exception scenarios, known as Java Exception Handling.
How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
We describe the deployment and use of Globus Compute for remote computation. This content is aimed at researchers who wish to compute on remote resources using a unified programming interface, as well as system administrators who will deploy and operate Globus Compute services on their research computing infrastructure.
Listen to the keynote address and hear about the latest developments from Rachana Ananthakrishnan and Ian Foster who review the updates to the Globus Platform and Service, and the relevance of Globus to the scientific community as an automation platform to accelerate scientific discovery.
Enhancing Research Orchestration Capabilities at ORNL.pdfGlobus
Cross-facility research orchestration comes with ever-changing constraints regarding the availability and suitability of various compute and data resources. In short, a flexible data and processing fabric is needed to enable the dynamic redirection of data and compute tasks throughout the lifecycle of an experiment. In this talk, we illustrate how we easily leveraged Globus services to instrument the ACE research testbed at the Oak Ridge Leadership Computing Facility with flexible data and task orchestration capabilities.
Large Language Models and the End of ProgrammingMatt Welsh
Talk by Matt Welsh at Craft Conference 2024 on the impact that Large Language Models will have on the future of software development. In this talk, I discuss the ways in which LLMs will impact the software industry, from replacing human software developers with AI, to replacing conventional software with models that perform reasoning, computation, and problem-solving.
Accelerate Enterprise Software Engineering with PlatformlessWSO2
Key takeaways:
Challenges of building platforms and the benefits of platformless.
Key principles of platformless, including API-first, cloud-native middleware, platform engineering, and developer experience.
How Choreo enables the platformless experience.
How key concepts like application architecture, domain-driven design, zero trust, and cell-based architecture are inherently a part of Choreo.
Demo of an end-to-end app built and deployed on Choreo.
Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
- The Art of Effective Code Reviews
- Streamlining the Review Process
- Elevating Reviews with Automated Tools
By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
Exploring Innovations in Data Repository Solutions - Insights from the U.S. G...Globus
The U.S. Geological Survey (USGS) has made substantial investments in meeting evolving scientific, technical, and policy driven demands on storing, managing, and delivering data. As these demands continue to grow in complexity and scale, the USGS must continue to explore innovative solutions to improve its management, curation, sharing, delivering, and preservation approaches for large-scale research data. Supporting these needs, the USGS has partnered with the University of Chicago-Globus to research and develop advanced repository components and workflows leveraging its current investment in Globus. The primary outcome of this partnership includes the development of a prototype enterprise repository, driven by USGS Data Release requirements, through exploration and implementation of the entire suite of the Globus platform offerings, including Globus Flow, Globus Auth, Globus Transfer, and Globus Search. This presentation will provide insights into this research partnership, introduce the unique requirements and challenges being addressed and provide relevant project progress.
Software Engineering, Software Consulting, Tech Lead.
Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Security,
Spring Transaction, Spring MVC,
Log4j, REST/SOAP WEB-SERVICES.
Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
For more Tendenci AMS events, check out www.tendenci.com/events
Climate Science Flows: Enabling Petabyte-Scale Climate Analysis with the Eart...Globus
The Earth System Grid Federation (ESGF) is a global network of data servers that archives and distributes the planet’s largest collection of Earth system model output for thousands of climate and environmental scientists worldwide. Many of these petabyte-scale data archives are located in proximity to large high-performance computing (HPC) or cloud computing resources, but the primary workflow for data users consists of transferring data, and applying computations on a different system. As a part of the ESGF 2.0 US project (funded by the United States Department of Energy Office of Science), we developed pre-defined data workflows, which can be run on-demand, capable of applying many data reduction and data analysis to the large ESGF data archives, transferring only the resultant analysis (ex. visualizations, smaller data files). In this talk, we will showcase a few of these workflows, highlighting how Globus Flows can be used for petabyte-scale climate analysis.
Why React Native as a Strategic Advantage for Startup Innovation.pdfayushiqss
Do you know that React Native is being increasingly adopted by startups as well as big companies in the mobile app development industry? Big names like Facebook, Instagram, and Pinterest have already integrated this robust open-source framework.
In fact, according to a report by Statista, the number of React Native developers has been steadily increasing over the years, reaching an estimated 1.9 million by the end of 2024. This means that the demand for this framework in the job market has been growing making it a valuable skill.
But what makes React Native so popular for mobile application development? It offers excellent cross-platform capabilities among other benefits. This way, with React Native, developers can write code once and run it on both iOS and Android devices thus saving time and resources leading to shorter development cycles hence faster time-to-market for your app.
Let’s take the example of a startup, which wanted to release their app on both iOS and Android at once. Through the use of React Native they managed to create an app and bring it into the market within a very short period. This helped them gain an advantage over their competitors because they had access to a large user base who were able to generate revenue quickly for them.
How to Position Your Globus Data Portal for Success Ten Good PracticesGlobus
Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
Multiple Your Crypto Portfolio with the Innovative Features of Advanced Crypt...Hivelance Technology
Cryptocurrency trading bots are computer programs designed to automate buying, selling, and managing cryptocurrency transactions. These bots utilize advanced algorithms and machine learning techniques to analyze market data, identify trading opportunities, and execute trades on behalf of their users. By automating the decision-making process, crypto trading bots can react to market changes faster than human traders
Hivelance, a leading provider of cryptocurrency trading bot development services, stands out as the premier choice for crypto traders and developers. Hivelance boasts a team of seasoned cryptocurrency experts and software engineers who deeply understand the crypto market and the latest trends in automated trading, Hivelance leverages the latest technologies and tools in the industry, including advanced AI and machine learning algorithms, to create highly efficient and adaptable crypto trading bots
top nidhi software solution freedownloadvrstrong314
This presentation emphasizes the importance of data security and legal compliance for Nidhi companies in India. It highlights how online Nidhi software solutions, like Vector Nidhi Software, offer advanced features tailored to these needs. Key aspects include encryption, access controls, and audit trails to ensure data security. The software complies with regulatory guidelines from the MCA and RBI and adheres to Nidhi Rules, 2014. With customizable, user-friendly interfaces and real-time features, these Nidhi software solutions enhance efficiency, support growth, and provide exceptional member services. The presentation concludes with contact information for further inquiries.
SOCRadar Research Team: Latest Activities of IntelBrokerSOCRadar
The European Union Agency for Law Enforcement Cooperation (Europol) has suffered an alleged data breach after a notorious threat actor claimed to have exfiltrated data from its systems. Infamous data leaker IntelBroker posted on the even more infamous BreachForums hacking forum, saying that Europol suffered a data breach this month.
The alleged breach affected Europol agencies CCSE, EC3, Europol Platform for Experts, Law Enforcement Forum, and SIRIUS. Infiltration of these entities can disrupt ongoing investigations and compromise sensitive intelligence shared among international law enforcement agencies.
However, this is neither the first nor the last activity of IntekBroker. We have compiled for you what happened in the last few days. To track such hacker activities on dark web sources like hacker forums, private Telegram channels, and other hidden platforms where cyber threats often originate, you can check SOCRadar’s Dark Web News.
Stay Informed on Threat Actors’ Activity on the Dark Web with SOCRadar!
Unleash Unlimited Potential with One-Time Purchase
BoxLang is more than just a language; it's a community. By choosing a Visionary License, you're not just investing in your success, you're actively contributing to the ongoing development and support of BoxLang.
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Agenda
❖ Errors & Exceptions
❖ Stack Trace
❖ Types of Exceptions
❖ Exception Handling
❖ try-catch-finally blocks
❖ try with resources
❖ Multiple Exceptions in Single Catch
❖ Advantages of Exception Handling
❖ Custom exceptions
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Exceptions
➔ An "exceptional condition" that alters the normal program flow
➔ Derive from class Exception
➔ Exception is said to be "thrown" and an Exception Handler "catches" it
➔ Includes File Not Found, Network connection was lost, etc.
Errors
➔ Represent unusual situations that are not caused by, and are external
to, the application
➔ Application won't be able to recover from an Error, so these aren't
required to handle
➔ Includes JVM running out of memory, hardware error, etc
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Stack Trace
➔ A list of the method calls that the application was in the middle of when an
Exception was thrown.
➔ Example : Book.java
public String getTitle() {
System.out.println(title.toString()); <-- line 16
return title;
}
➔ Exception in thread "main" java.lang.NullPointerException
at com.example.myproject.Book.getTitle(Book.java:16)
at com.example.myproject.Author.getBookTitles(Author.java:25)
at com.example.myproject.Bootstrap.main(Bootstrap.java:14)
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What exception is not
➔ Exception is not a Message to be shown in the UI
➔ Exceptions are for programmers and support staff.
➔ For displaying in UI use externalized strings
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Types of Exceptions
➔ Checked Exceptions
◆ Checked at compile time
◆ Must be either handled or
specified using throws keyword
➔ Unchecked Exceptions
◆ Not checked at compile time
◆ Also called as Runtime Exceptions
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Checked Exception Example
➔ import java.io.*;
class Main {
public static void main(String[] args) {
FileReader file = new FileReader("a.txt");
BufferedReader fileInput = new BufferedReader(file);
}
}
➔ Compilation Error:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code -
unreported exception java.io.FileNotFoundException; must be caught or declared to be
thrown
at Main.main(Main.java:5)
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Runtime Exception Example
➔ class Main {
public static void main(String args[]) {
int x = 0;
int y = 10;
int z = y/x;
}
}
➔ Exception in thread "main" java.lang.ArithmeticException: / by zero
at Main.main(Main.java:5)
Java Result: 1
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Exception Handling
➔ Mechanism to handle runtime malfunctions
➔ Transferring the execution of a program to an appropriate exception
handler when an exception occurs
Java Exception Handling Keywords
◆ try
◆ catch
◆ finally
◆ throw
◆ throws
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try-catch blocks
➔ try block :
◆ Used to enclose the code that might throw an exception.
◆ Must be used within the method.
◆ Java try block must be followed by either catch or finally block.
➔ catch block
◆ Java catch block is used to handle the Exception. It must be used after the
try block only.
◆ You can use multiple catch block with a single try.
Syntax of java try-catch
try{
//code that may throw exception
}catch(Exception_class_Name ref){
}
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Example
public class Testtrycatch{
public static void main(String args[]){
try{
int data=50/0;
}catch(ArithmeticException e){
System.out.println(e);
}
System.out.println("Executing rest of the code...");
}
}
Output :
Exception in thread main java.lang.ArithmeticException:/ by zero
Executing rest of the code...
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finally block
➔ Follows a try block.
➔ Always executes, whether or not an exception has occurred.
➔ Allows you to run any cleanup-type statements that you want to execute, no
matter what happens in the protected code.
➔ Executes right before the return executes present in try block.
Syntax of try-finally block:
try{
// Protected Code that may throw exception
}catch(Exception ex){
// Catch block may or may not execute
}finally{
// The finally block always executes.
}
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Try with resources
➔ JDK 7 introduces a new version of try statement known as try-with-
resources statement. This feature add another way to exception handling
with resources management,it is also referred to as automatic resource
management.
try(resource-specification)
{
//use the resource
}catch()
{...}
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Multi catch block
➔ To perform different tasks at the occurrence of different Exceptions
➔ At a time only one Exception is occurred and at a time only one catch block is executed.
➔ All catch blocks must be ordered from most specific to most general i.e. catch for ArithmeticException
must come before catch for Exception
public class TestMultipleCatchBlock{
public static void main(String args[]){
try{
int a[]=new int[5];
a[5]=30/0;
}
catch(ArithmeticException e){System.out.println("task1 is completed");}
catch(ArrayIndexOutOfBoundsException e){System.out.println("task 2 completed");}
catch(Exception e){System.out.println("common task completed");}
System.out.println("rest of the code...");
}
}
Output:
task1 completed
rest of the code...
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Multiple Exceptions in Single Catch
Since Java 7, more than one exceptions can be handled using a single catch block
try{
// Code that may throw exception
} catch (IOException|FileNotFoundException ex) {
logger.log(ex);
}
Bytecode generated by compiling a catch block that handles multiple exception
types will be smaller (and thus superior) than 2 different catch blocks.
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throw keyword
➔ throw :
◆ Used to explicitly throw an exception
◆ Can be used to throw checked, unchecked and custom exception
public class TestThrow1{
static void validate(int age){
if(age<18)
throw new ArithmeticException("not valid");
else
System.out.println("welcome to vote");
}
public static void main(String args[]){
validate(13);
System.out.println("rest of the code...");
}
}
Output:
Exception in thread main java.lang.ArithmeticException:not valid
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throws keyword
➔ throws :
◆ Used to declare an exception
◆ Gives an information to the programmer that there may occur an exception so it is better for the
programmer to provide the exception handling code so that normal flow can be maintained.
import java.io.IOException;
class Testthrows{
void secondMethod() throws IOException {
throw new IOException("device error");//checked exception
}
void firstMethod() throws IOException {
secondMethod();
}
public static void main(final String args[]) {
final Testthrows obj = new Testthrows();
try {
obj.firstMethod();
} catch (final Exception e) {
System.out.println("exception handled");
}
System.out.println("normal flow...");
}
Output:
exception handled
normal flow...
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Exception Handling with Method Overriding
➔ If the superclass method does not declare an exception, subclass overridden method cannot declare the
checked exception but it can declare unchecked exception.
import java.io.*;
class Parent{
void msg(){System.out.println("parent");}
}
class TestExceptionChild extends Parent{
void msg()throws IOException{
System.out.println("TestExceptionChild");
}
public static void main(String args[]){
Parent parent=new TestExceptionChild();
parent.msg();
}
}
Output:
Compile Time Error
import java.io.*;
class Parent{
void msg(){System.out.println("parent");}
}
class TestExceptionChild1 extends Parent{
void msg()throws ArithmeticException{
System.out.println("child");
}
public static void main(String args[]){
Parent p=new TestExceptionChild1();
p.msg();
}
}
Output:
child
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Exception Handling with Method Overriding
➔ If the superclass method declares an exception, subclass overridden method can declare same, subclass
exception or no exception but cannot declare parent exception.
import java.io.*;
class Parent{
void msg()throws ArithmeticException{System.out.println("parent");}
}
class TestExceptionChild extends Parent{
void msg()throws Exception{System.out.println("child");}
public static void main(String args[]){
Parent p=new TestExceptionChild();
try{
p.msg();
}catch(Exception e){}
}
}
Output:
Compile Time Error
import java.io.*;
class Parent{
void msg()throws Exception{System.out.println("parent");}
}
class TestExceptionChild1 extends Parent{
void msg()throws ArithmeticException{System.out.println("child");}
public static void main(String args[]){
Parent p=new TestExceptionChild1();
try{
p.msg();
}catch(Exception e){}
}
}
Output:
child
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Advantages of Exception Handling
➔ To maintain the normal flow of the application
➔ Separating Error-Handling Code from "Regular" Code
➔ Propagating Errors Up the Call Stack
➔ Grouping and Differentiating Error Types
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Custom Exceptions
➔ If you are creating your own Exception that is known as custom
exception or user-defined exception. Java custom exceptions are used to
customize the exception according to user need.
➔ By the help of custom exception, you can have your own exception and
message.
➔ To create a custom checked exception, we have to sub-class from the
java.lang.Exception class. And that’s it! Yes, creating a custom exception in
java is simple as that!
public class CustomException extends Exception{}