The document discusses exception handling in Java. It introduces exceptions as conditions caused by runtime errors and how exception handling helps detect and report these "exceptional circumstances." It explains the types of errors like runtime, logic, and syntax errors. It provides examples of exception handling using try-catch blocks to handle exceptions locally or declaring throws to pass exceptions to other methods. Finally, it discusses standard Java exceptions and provides code examples demonstrating exception handling.
Exceptions are a powerful mechanism for centralized processing of errors and exceptional situations. This mechanism replaces the procedure-oriented method of error handling in which each function returns a code indicating an error or a successful execution.
The exception hierarchy
Exception handling fundamentals
Try and catch
The consequences of an uncaught exception
Using multiple catch statements
Catching subclass exceptions
Nested try blocks
Throwing an exception
Re-throwing an exception
Using finally
Using throws
Java’s built-in exception
Creating exception subclasses
Exceptions are a powerful mechanism for centralized processing of errors and exceptional situations. This mechanism replaces the procedure-oriented method of error handling in which each function returns a code indicating an error or a successful execution.
The exception hierarchy
Exception handling fundamentals
Try and catch
The consequences of an uncaught exception
Using multiple catch statements
Catching subclass exceptions
Nested try blocks
Throwing an exception
Re-throwing an exception
Using finally
Using throws
Java’s built-in exception
Creating exception subclasses
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
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NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
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Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
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Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
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About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
2. Objectives
• Introduction
• What exceptions are for
• Catching & Throwing exceptions
• Exception Specifications
• Standard Java Exceptions
• Exceptions and Polymorphism
• The finally clause
• Resource Management
• Uncaught Exceptions
3. Introduction
• Due to design errors or coding errors, our
programs may fail in unexpected ways during
execution. An exception is a condition that is
caused by run time error in the program. The
purpose of the exception handling mechanism
is to provide a means to detect and report an
“ecxceptional circumstances” .
4. Error
• An error may produce an incorrect output or
may terminate the execution of the program
abruptly or even may cause the system to
crash. So it is our responsibility to detect and
manage the error properly.
5. Types of error
• Runtime Errors: occur while the program is
running if the environment detects an
operation that is impossible to carry out.
• Logic Errors: occur when a program doesn't
perform the way it was intended
• Syntax Errors: Arise because the rules of the
language have not been followed. They are
detected by the compiler.
6. Example of Run Time error
Class Error
{
public static void main(String args[])
{
int a=10;
int b=5;
int c=5;
int x=a/(b+c);
System.out.println("x=" +x);
int y=a/(b-c); // Errorr division by zero
System.out.println("y=" +y);
}
}
7. Errors and Error Handling
• Some typical causes of errors:
– Memory errors (i.e. memory incorrectly allocated,
memory leaks, “null pointer”)
– File system errors (i.e. disk is full, disk has been
removed)
– Network errors (i.e. network is down, URL does
not exist)
– Calculation errors (i.e. divide by 0)
8. Errors and Error Handling
• More typical causes of errors:
– Array errors (i.e. accessing element –1)
– Conversion errors (i.e. convert ‘q’ to a number)
– Can you think of some others?
9. Errors and Error Handling
• Exceptions – a better error handling
– Exceptions are a mechanism that provides the
best of both worlds.
– Exceptions act similar to method return flags in
that any method may raise and exception should it
encounter an error.
– Exceptions act like global error methods in that
the exception mechanism is built into Java;
exceptions are handled at many levels in a
program, locally and/or globally.
10. Exceptions
• How do you handle exceptions?
– To handle the exception, you write a “try-catch”
block. To pass the exception “up the chain”, you
declare a throws clause in your method or class
declaration.
– If the method contains code that may cause a
checked exception, you MUST handle the
exception OR pass the exception to the parent
class (remember, every class has Object as the
ultimate parent)
11. Coding Exceptions
• Coding Exceptions
• Try-Catch Mechanism
– Wherever your code may trigger an exception, the
normal code logic is placed inside a block of code
starting with the “try” keyword:
– After the try block, the code to handle the
exception should it arise is placed in a block of
code starting with the “catch” keyword.
13. Catching Exceptions
• Wrap code to be checked in a try-block
– checking occurs all the way down the execution
stack
• try-blocks can be nested
– control resumes at most enclosed matching
handler
16. Code Examples
• 1. Demonstration of an unchecked exception
(NullPointerException)
• 2. Demonstration of checked exceptions:
– Passing a DivideByZeroException
– Handling a DivideByZeroException
17. Example
class error2
{
public static void main(String arg[])
{
int a=10;
int b=5;
int c=5;
int x,y;
try
{
x=a/(b-c);
}
catch(ArithmeticException e)
{
System.out.println(“Division by Zero”);
}
Y=a/(b-c);
System.out.println(“y=“+y);
}
}
18. In the previous program we cannot see the
value of x just because of the error in the
value of y, that is division by zero but when we
use the try and catch blocks in exception
handling then we can see the value of y which
is correct and our program will display an
error message shown in the try block.
19. conclusion
– Exceptions are a powerful error handling
mechanism.
– Exceptions in Java are built into the language.
– Exceptions can be handled by the programmer
(try-catch), or handled by the Java environment
(throws).
– Exception handling can only hide the errors.
– It cannot correct the errors.