This document discusses exception handling in Java. It defines exceptions as abnormal conditions that disrupt normal program flow. Exception handling allows programs to gracefully handle runtime errors. The key aspects covered include the exception hierarchy, try-catch-finally syntax, checked and unchecked exceptions, and creating user-defined exceptions.
The document discusses exception handling in Java. It defines exceptions as runtime errors that occur during program execution. It describes different types of exceptions like checked exceptions and unchecked exceptions. It explains how to use try, catch, throw, throws and finally keywords to handle exceptions. The try block contains code that might throw exceptions. The catch block catches and handles specific exceptions. The finally block contains cleanup code that always executes regardless of exceptions. The document provides examples of exception handling code in Java.
The document summarizes a presentation on exception handling given by the group "Bug Free". It defines what exceptions are, why they occur, and the exception hierarchy. It describes checked and unchecked exceptions, and exception handling terms like try, catch, throw, and finally. It provides examples of using try-catch blocks, multiple catch statements, nested try-catch, and throwing and handling exceptions.
- Java threads allow for multithreaded and parallel execution where different parts of a program can run simultaneously.
- There are two main ways to create a Java thread: extending the Thread class or implementing the Runnable interface.
- To start a thread, its start() method must be called rather than run(). Calling run() results in serial execution rather than parallel execution of threads.
- Synchronized methods use intrinsic locks on objects to allow only one thread to execute synchronized code at a time, preventing race conditions when accessing shared resources.
The document discusses exception handling in Java. It defines exceptions as abnormal conditions that arise during runtime and disrupt normal program flow. There are three types of exceptions: checked exceptions which must be declared, unchecked exceptions which do not need to be declared, and errors which are rare and cannot be recovered from. The try, catch, and finally blocks are used to handle exceptions, with catch blocks handling specific exception types and finally blocks containing cleanup code.
The document discusses arrays in Java, including how to declare and initialize one-dimensional and two-dimensional arrays, access array elements, pass arrays as parameters, and sort and search arrays. It also covers arrays of objects and examples of using arrays to store student data and daily temperature readings from multiple cities over multiple days.
This document discusses strings and string buffers in Java. It defines strings as sequences of characters that are class objects implemented using the String and StringBuffer classes. It provides examples of declaring, initializing, concatenating and using various methods like length(), charAt() etc. on strings. The document also introduces the StringBuffer class for mutable strings and lists some common StringBuffer functions.
This document discusses interfaces in Java. It defines an interface as a blueprint of a class that defines static constants and abstract methods. Interfaces are used to achieve abstraction and multiple inheritance in Java. They represent an "is-a" relationship. There are three main reasons to use interfaces - for abstraction, to support multiple inheritance functionality, and to achieve loose coupling. The document provides examples of interfaces, such as a Printable interface and implementations in different classes. It also demonstrates multiple inheritance using interfaces and interface inheritance.
The document discusses exception handling in Java. It defines exceptions as runtime errors that occur during program execution. It describes different types of exceptions like checked exceptions and unchecked exceptions. It explains how to use try, catch, throw, throws and finally keywords to handle exceptions. The try block contains code that might throw exceptions. The catch block catches and handles specific exceptions. The finally block contains cleanup code that always executes regardless of exceptions. The document provides examples of exception handling code in Java.
The document summarizes a presentation on exception handling given by the group "Bug Free". It defines what exceptions are, why they occur, and the exception hierarchy. It describes checked and unchecked exceptions, and exception handling terms like try, catch, throw, and finally. It provides examples of using try-catch blocks, multiple catch statements, nested try-catch, and throwing and handling exceptions.
- Java threads allow for multithreaded and parallel execution where different parts of a program can run simultaneously.
- There are two main ways to create a Java thread: extending the Thread class or implementing the Runnable interface.
- To start a thread, its start() method must be called rather than run(). Calling run() results in serial execution rather than parallel execution of threads.
- Synchronized methods use intrinsic locks on objects to allow only one thread to execute synchronized code at a time, preventing race conditions when accessing shared resources.
The document discusses exception handling in Java. It defines exceptions as abnormal conditions that arise during runtime and disrupt normal program flow. There are three types of exceptions: checked exceptions which must be declared, unchecked exceptions which do not need to be declared, and errors which are rare and cannot be recovered from. The try, catch, and finally blocks are used to handle exceptions, with catch blocks handling specific exception types and finally blocks containing cleanup code.
The document discusses arrays in Java, including how to declare and initialize one-dimensional and two-dimensional arrays, access array elements, pass arrays as parameters, and sort and search arrays. It also covers arrays of objects and examples of using arrays to store student data and daily temperature readings from multiple cities over multiple days.
This document discusses strings and string buffers in Java. It defines strings as sequences of characters that are class objects implemented using the String and StringBuffer classes. It provides examples of declaring, initializing, concatenating and using various methods like length(), charAt() etc. on strings. The document also introduces the StringBuffer class for mutable strings and lists some common StringBuffer functions.
This document discusses interfaces in Java. It defines an interface as a blueprint of a class that defines static constants and abstract methods. Interfaces are used to achieve abstraction and multiple inheritance in Java. They represent an "is-a" relationship. There are three main reasons to use interfaces - for abstraction, to support multiple inheritance functionality, and to achieve loose coupling. The document provides examples of interfaces, such as a Printable interface and implementations in different classes. It also demonstrates multiple inheritance using interfaces and interface inheritance.
This document discusses Java strings and provides information about:
1. What strings are in Java and how they are treated as objects of the String class. Strings are immutable.
2. Two ways to create String objects: using string literals or the new keyword.
3. Important string methods like concatenation, comparison, substring, and length; and string classes like StringBuffer and StringBuilder that allow mutability.
An exception is a problem that arises during program execution and can occur for reasons such as invalid user input, unavailable files, or lost network connections. Exceptions are categorized as checked exceptions which cannot be ignored, runtime exceptions which could have been avoided, or errors beyond the user's or programmer's control. The document further describes how to define, throw, catch, and handle exceptions in Java code using try/catch blocks and by declaring exceptions in method signatures.
The document discusses exception handling in Java. It begins by defining exceptions as abnormal runtime errors. It then explains the five keywords used for exception handling in Java: try, catch, throw, throws, and finally. It provides examples of using these keywords and describes their purposes. Specifically, it explains that try is used to monitor for exceptions, catch handles caught exceptions, throw explicitly throws exceptions, throws specifies exceptions a method can throw, and finally contains cleanup code. The document also discusses uncaught exceptions, multiple catch blocks, nested try blocks, and the finally block. It provides syntax and examples for different exception handling concepts in Java.
This is the presentation file about inheritance in java. You can learn details about inheritance and method overriding in inheritance in java. I think it's can help your. Thank you.
This document discusses exception handling in C++ and Java. It defines what exceptions are and explains that exception handling separates error handling code from normal code to make programs more readable and robust. It covers try/catch blocks, throwing and catching exceptions, and exception hierarchies. Finally, it provides an example of implementing exception handling in a C++ program to handle divide-by-zero errors.
Packages in Java allow grouping of related classes and interfaces to avoid naming collisions. Some key points about packages include:
- Packages allow for code reusability and easy location of files. The Java API uses packages to organize core classes.
- Custom packages can be created by specifying the package name at the beginning of a Java file. The class files are then compiled to the corresponding directory structure.
- The import statement and fully qualified names can be used to access classes from other packages. The classpath variable specifies locations of package directories and classes.
The document discusses exceptions handling in .NET. It defines exceptions as objects that deliver a powerful mechanism for centralized handling of errors and unusual events. It describes how exceptions can be handled using try-catch blocks, and how finally blocks ensure code execution regardless of exceptions. It also covers the Exception class hierarchy, throwing exceptions with the throw keyword, and best practices like ordering catch blocks and avoiding exceptions for normal flow control.
The document discusses exception handling in programming. It defines different types of errors like syntax errors, semantic errors, and logical errors. Runtime errors can occur due to issues like division by zero. Exception handling involves finding and throwing exceptions using try, catch, and throw keywords. The catch block handles the exception. Common Java exceptions include NullPointerException, FileNotFoundException, and ArrayIndexOutOfBoundsException.
This document provides an overview of Java input/output (I/O) concepts including reading from and writing to the console, files, and streams. It discusses different I/O stream classes like PrintStream, InputStream, FileReader, FileWriter, BufferedReader, and how to read/write characters, bytes and objects in Java. The document also introduces new I/O features in Java 7 like try-with-resources for automatic resource management.
The document discusses Java wrapper classes. Wrapper classes wrap primitive data types like int, double, boolean in objects. This allows primitive types to be used like objects. The main wrapper classes are Byte, Short, Integer, Long, Character, Boolean, Double, Float. They provide methods to convert between primitive types and their wrapper objects. Constructors take primitive values or strings to create wrapper objects. Methods like parseInt() convert strings to primitive types.
This document discusses Java collections framework and various collection classes like ArrayList, LinkedList, HashSet, HashMap etc. It provides definitions and examples of commonly used collection interfaces like List, Set and Map. It explains key features of different collection classes like order, duplicates allowed, synchronization etc. Iterators and generic types are also covered with examples to iterate and create typed collection classes.
This document discusses exception handling in Java. It defines exceptions as events that disrupt normal program flow. It describes try/catch blocks for handling exceptions and lists advantages like separating error handling code. It discusses different exception types like checked exceptions that must be declared, unchecked exceptions for logic errors, and Errors for JVM problems. It provides best practices like throwing exceptions for broken contracts and guidelines for when to catch exceptions. It also describes antipatterns to avoid, like catching generic exceptions, and exception logging and chaining techniques.
The document discusses exception handling in Java. It begins by defining what errors and exceptions are, and how traditional error handling works. It then explains how exception handling in Java works using keywords like try, catch, throw, throws and finally. The document discusses checked and unchecked exceptions, common Java exceptions, how to define custom exceptions, and rethrowing exceptions. It notes advantages of exceptions like separating error handling code and propagating errors up the call stack.
The document discusses various Java I/O streams including input streams, output streams, byte streams, character streams, buffered streams, properties class, print stream, file locking, serialization and print writer class. It provides examples of reading and writing files using FileInputStream, FileOutputStream, FileReader, FileWriter and other stream classes. Methods of different stream classes are also explained along with their usage.
String is a non-primitive and immutable data type in Java that represents a sequence of characters. It is stored in the String Constant Pool in the heap memory. Methods like equals(), concat(), contains(), indexOf() etc. are used to perform operations on strings. String is immutable to prevent unexpected behavior if the contents of a string are changed.
This document provides an overview of object-oriented programming concepts in Java including inheritance, polymorphism, abstraction, and encapsulation. It also discusses control structures like if/else statements and switches as well as repetition structures like while, do-while, and for loops. Arithmetic operations in Java like addition, subtraction, multiplication, and division are also mentioned.
This document discusses implementation of inheritance in Java and C#. It covers key inheritance concepts like simple, multilevel, and hierarchical inheritance. It provides examples of inheritance in Java using keywords like extends, super, this. Interfaces are discussed as a way to achieve multiple inheritance in Java. The document also discusses implementation of inheritance in C# using concepts like calling base class constructors and defining virtual methods.
The document discusses method overloading and overriding in Java. It defines method overloading as having multiple methods with the same name but different parameters, while overriding involves subclasses providing specific implementations of methods in the parent class. It provides examples of overloading methods by changing parameters and data types, and explains why overriding is not possible by only changing the return type due to ambiguity. The use of the super keyword to refer to parent class members is also explained.
Selection Statements
Using if and if...else
Nested if Statements
Using switch Statements
Conditional Operator
Repetition Statements
Looping: while, do, and for
Nested loops
Using break and continue
This document provides an overview of exception handling in Java. It discusses what exceptions are, what happens when exceptions occur, benefits of Java's exception handling framework such as separating error handling code and propagating exceptions up the call stack. It also covers catching exceptions using try-catch and finally blocks, throwing custom exceptions, the exception class hierarchy, and differences between checked and unchecked exceptions. The document concludes with a discussion of assertions.
The document discusses exception handling in Java programming. It covers the basics of exceptions, using try/catch blocks, throwing and catching multiple exceptions, and the finally block. It also discusses advantages of exception handling, specifying exceptions methods can throw, tracing exceptions through the call stack, creating custom exceptions, and using assertions. The key topics are exceptions, try/catch/finally, throwing exceptions, and creating and handling exceptions.
This document discusses Java strings and provides information about:
1. What strings are in Java and how they are treated as objects of the String class. Strings are immutable.
2. Two ways to create String objects: using string literals or the new keyword.
3. Important string methods like concatenation, comparison, substring, and length; and string classes like StringBuffer and StringBuilder that allow mutability.
An exception is a problem that arises during program execution and can occur for reasons such as invalid user input, unavailable files, or lost network connections. Exceptions are categorized as checked exceptions which cannot be ignored, runtime exceptions which could have been avoided, or errors beyond the user's or programmer's control. The document further describes how to define, throw, catch, and handle exceptions in Java code using try/catch blocks and by declaring exceptions in method signatures.
The document discusses exception handling in Java. It begins by defining exceptions as abnormal runtime errors. It then explains the five keywords used for exception handling in Java: try, catch, throw, throws, and finally. It provides examples of using these keywords and describes their purposes. Specifically, it explains that try is used to monitor for exceptions, catch handles caught exceptions, throw explicitly throws exceptions, throws specifies exceptions a method can throw, and finally contains cleanup code. The document also discusses uncaught exceptions, multiple catch blocks, nested try blocks, and the finally block. It provides syntax and examples for different exception handling concepts in Java.
This is the presentation file about inheritance in java. You can learn details about inheritance and method overriding in inheritance in java. I think it's can help your. Thank you.
This document discusses exception handling in C++ and Java. It defines what exceptions are and explains that exception handling separates error handling code from normal code to make programs more readable and robust. It covers try/catch blocks, throwing and catching exceptions, and exception hierarchies. Finally, it provides an example of implementing exception handling in a C++ program to handle divide-by-zero errors.
Packages in Java allow grouping of related classes and interfaces to avoid naming collisions. Some key points about packages include:
- Packages allow for code reusability and easy location of files. The Java API uses packages to organize core classes.
- Custom packages can be created by specifying the package name at the beginning of a Java file. The class files are then compiled to the corresponding directory structure.
- The import statement and fully qualified names can be used to access classes from other packages. The classpath variable specifies locations of package directories and classes.
The document discusses exceptions handling in .NET. It defines exceptions as objects that deliver a powerful mechanism for centralized handling of errors and unusual events. It describes how exceptions can be handled using try-catch blocks, and how finally blocks ensure code execution regardless of exceptions. It also covers the Exception class hierarchy, throwing exceptions with the throw keyword, and best practices like ordering catch blocks and avoiding exceptions for normal flow control.
The document discusses exception handling in programming. It defines different types of errors like syntax errors, semantic errors, and logical errors. Runtime errors can occur due to issues like division by zero. Exception handling involves finding and throwing exceptions using try, catch, and throw keywords. The catch block handles the exception. Common Java exceptions include NullPointerException, FileNotFoundException, and ArrayIndexOutOfBoundsException.
This document provides an overview of Java input/output (I/O) concepts including reading from and writing to the console, files, and streams. It discusses different I/O stream classes like PrintStream, InputStream, FileReader, FileWriter, BufferedReader, and how to read/write characters, bytes and objects in Java. The document also introduces new I/O features in Java 7 like try-with-resources for automatic resource management.
The document discusses Java wrapper classes. Wrapper classes wrap primitive data types like int, double, boolean in objects. This allows primitive types to be used like objects. The main wrapper classes are Byte, Short, Integer, Long, Character, Boolean, Double, Float. They provide methods to convert between primitive types and their wrapper objects. Constructors take primitive values or strings to create wrapper objects. Methods like parseInt() convert strings to primitive types.
This document discusses Java collections framework and various collection classes like ArrayList, LinkedList, HashSet, HashMap etc. It provides definitions and examples of commonly used collection interfaces like List, Set and Map. It explains key features of different collection classes like order, duplicates allowed, synchronization etc. Iterators and generic types are also covered with examples to iterate and create typed collection classes.
This document discusses exception handling in Java. It defines exceptions as events that disrupt normal program flow. It describes try/catch blocks for handling exceptions and lists advantages like separating error handling code. It discusses different exception types like checked exceptions that must be declared, unchecked exceptions for logic errors, and Errors for JVM problems. It provides best practices like throwing exceptions for broken contracts and guidelines for when to catch exceptions. It also describes antipatterns to avoid, like catching generic exceptions, and exception logging and chaining techniques.
The document discusses exception handling in Java. It begins by defining what errors and exceptions are, and how traditional error handling works. It then explains how exception handling in Java works using keywords like try, catch, throw, throws and finally. The document discusses checked and unchecked exceptions, common Java exceptions, how to define custom exceptions, and rethrowing exceptions. It notes advantages of exceptions like separating error handling code and propagating errors up the call stack.
The document discusses various Java I/O streams including input streams, output streams, byte streams, character streams, buffered streams, properties class, print stream, file locking, serialization and print writer class. It provides examples of reading and writing files using FileInputStream, FileOutputStream, FileReader, FileWriter and other stream classes. Methods of different stream classes are also explained along with their usage.
String is a non-primitive and immutable data type in Java that represents a sequence of characters. It is stored in the String Constant Pool in the heap memory. Methods like equals(), concat(), contains(), indexOf() etc. are used to perform operations on strings. String is immutable to prevent unexpected behavior if the contents of a string are changed.
This document provides an overview of object-oriented programming concepts in Java including inheritance, polymorphism, abstraction, and encapsulation. It also discusses control structures like if/else statements and switches as well as repetition structures like while, do-while, and for loops. Arithmetic operations in Java like addition, subtraction, multiplication, and division are also mentioned.
This document discusses implementation of inheritance in Java and C#. It covers key inheritance concepts like simple, multilevel, and hierarchical inheritance. It provides examples of inheritance in Java using keywords like extends, super, this. Interfaces are discussed as a way to achieve multiple inheritance in Java. The document also discusses implementation of inheritance in C# using concepts like calling base class constructors and defining virtual methods.
The document discusses method overloading and overriding in Java. It defines method overloading as having multiple methods with the same name but different parameters, while overriding involves subclasses providing specific implementations of methods in the parent class. It provides examples of overloading methods by changing parameters and data types, and explains why overriding is not possible by only changing the return type due to ambiguity. The use of the super keyword to refer to parent class members is also explained.
Selection Statements
Using if and if...else
Nested if Statements
Using switch Statements
Conditional Operator
Repetition Statements
Looping: while, do, and for
Nested loops
Using break and continue
This document provides an overview of exception handling in Java. It discusses what exceptions are, what happens when exceptions occur, benefits of Java's exception handling framework such as separating error handling code and propagating exceptions up the call stack. It also covers catching exceptions using try-catch and finally blocks, throwing custom exceptions, the exception class hierarchy, and differences between checked and unchecked exceptions. The document concludes with a discussion of assertions.
The document discusses exception handling in Java programming. It covers the basics of exceptions, using try/catch blocks, throwing and catching multiple exceptions, and the finally block. It also discusses advantages of exception handling, specifying exceptions methods can throw, tracing exceptions through the call stack, creating custom exceptions, and using assertions. The key topics are exceptions, try/catch/finally, throwing exceptions, and creating and handling exceptions.
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.
The document discusses exception handling in Java. It defines exceptions as errors encountered during program execution. Exception handling involves using try, catch, and finally blocks. The try block contains code that may throw exceptions. Catch blocks handle specific exception types, while finally blocks contain cleanup code that always executes. Common system-defined exceptions like NullPointerException and user-defined exceptions can be thrown using the throw keyword and handled using try-catch. Nested try-catch blocks and multiple catch blocks are also described.
This document discusses exception handling in Java. It defines an error as an unexpected result during program execution. Exceptions provide a better way to handle errors than errors by stopping normal program flow when an error occurs and handling the exception. There are two main types of exceptions in Java: checked exceptions which are checked at compile time, and unchecked exceptions which are checked at runtime. The try-catch block is used to handle exceptions by executing code that throws exceptions within a try block and catching any exceptions in catch blocks. Finally blocks allow executing code whether or not an exception occurs. Exceptions are thrown using the throw statement which requires a throwable object. Handling exceptions provides advantages like separating error code, grouping error types, consistency, flexibility and simplicity.
The document discusses exceptions in Java. It defines exceptions as errors that occur during program execution. The exception hierarchy is presented, dividing exceptions into checked, unchecked (which include errors), and runtime exceptions. Exception handling using try/catch blocks is explained along with the throws and throw statements. Creating custom exceptions by extending the Exception or RuntimeException classes is covered. Finally, examples of handling multiple exceptions and exception specifications in method signatures are provided.
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!
The document discusses effective use of exception handling in Java. It defines exceptions as abnormal conditions that occur during method execution. There are several types of exceptions, including checked exceptions that must be caught or declared, and unchecked exceptions that do not require handling. The document provides guidance on when to use checked vs unchecked exceptions and discusses approaches for designing exception handling in applications.
This document discusses exception handling in Java. It covers the key concepts of exceptions and errors, stack traces, checked and unchecked exceptions, try-catch-finally blocks, try with resources, multiple exceptions in a single catch, and advantages of exception handling like maintaining normal program flow. It also discusses custom exceptions by subclassing the Exception class.
The document discusses Java exceptions. It defines exceptions as abnormal conditions that disrupt normal program flow. It describes different types of exceptions like checked exceptions, unchecked exceptions, and errors. It explains exception handling in Java using try, catch, finally, throw and throws keywords. It provides examples to demonstrate various exceptions like NullPointerException, ArrayIndexOutOfBoundsException, and rethrowing exceptions.
1. Exception handling separates error-handling code from normal code to make programs more readable and robust.
2. There are two main types of exceptions: checked exceptions which must be caught or declared, and unchecked exceptions which do not typically need to be caught.
3. The try-catch block is used to catch exceptions, where code after the try is run inside a try block and any matching exceptions are caught and handled in corresponding catch blocks.
The document discusses various aspects of exception handling in Java such as the different types of exceptions (checked, unchecked, errors), keywords used in exception handling (try, catch, finally, throw, throws), and common scenarios where exceptions may occur. It provides examples of using try-catch blocks to handle exceptions, throwing custom exceptions using throw, and declaring exceptions in method signatures using throws. Finally, it discusses some key differences between concepts like final, finally and finalize in Java.
The document discusses exception handling in Java, including what exceptions are, the exception hierarchy, different types of exceptions, and how to handle exceptions using try, catch, throws, and finally. It also covers creating custom exceptions and methods for working with exceptions inherited from the Throwable class. The presentation covers exception concepts and best practices for anticipating, handling, and throwing exceptions in Java code.
unit 4 msbte syallbus for sem 4 2024-2025AKSHAYBHABAD5
The Intel 8086 microprocessor, designed by Intel in the late 1970s, is an 8-bit/16-bit microprocessor and the first member of the x86 family of microprocessors1. Here’s a brief overview of its internal architecture:
Complex Instruction Set Computer (CISC) Architecture: The 8086 microprocessor is based on a CISC architecture, which supports a wide range of instructions, many of which can perform multiple operations in a single instruction1.
Bus Interface Unit (BIU): The BIU is responsible for fetching instructions from memory and decoding them, while also managing data transfer between the microprocessor and memory or I/O devices1.
Execution Unit (EU): The EU executes the instructions1.
Memory Segmentation: The 8086 microprocessor has a segmented memory architecture, which means that memory is divided into segments that are addressed using both a segment register and an offset1.
Registers: The 8086 microprocessor has a rich set of registers, including general-purpose registers, segment registers, and special registers
An exception occurs when the normal flow of a program is disrupted, such as dividing by zero or accessing an out-of-bounds array element. Exceptions are handled using try-catch blocks to catch specific exceptions or finally blocks to clean up resources. Methods can throw exceptions using the throw statement or specify thrown exceptions in the method declaration using throws. Programmers can also create custom exception classes by extending the Exception class.
UNIT-3.pptx Exception Handling and MultithreadingSakkaravarthiS1
The document discusses exception handling and multithreading in Java. It covers exception handling basics like checked and unchecked exceptions. It describes try, catch, throw, throws and finally keywords used in exception handling. It also discusses multiple catch clauses, nested try blocks and built-in exceptions. For multithreading, it defines processes and threads, and how to create multiple threads and handle thread synchronization and priorities in Java.
The document discusses exception handling in Java. It defines exceptions as abnormal conditions that disrupt normal program flow. Exception handling allows the program to maintain normal flow when exceptions occur. There are two main types of exceptions: checked exceptions which must be declared, and unchecked exceptions which do not need to be declared. The try, catch, and finally keywords are used to handle exceptions, with try blocks enclosing code that might throw exceptions, catch blocks handling specific exceptions, and finally blocks containing cleanup code.
The document discusses exception handling in Java. It defines exceptions as abnormal conditions that disrupt normal program flow. Exception handling allows maintaining normal flow by catching and handling exceptions. There are two main exception types: checked exceptions which must be declared, and unchecked exceptions which do not. The try, catch, finally and throw keywords are used to define exception handling blocks to catch exceptions and define exception throwing methods. Finally blocks ensure code is always executed even if exceptions occur.
The document provides information about exceptions and applets in Java. It discusses exception handling in Java, including checked and unchecked exceptions. It also covers the try, catch, throw and throws keywords used in exception handling. Additionally, it describes applets in Java, including how applets extend the Applet class, their lifecycle through init(), start(), stop() and destroy() methods, and how to invoke an applet through HTML tags.
Exception handling in Java allows programs to gracefully deal with errors and unexpected conditions. There are five keywords used for exception handling: try, catch, throw, throws, and finally. Code that could generate an exception is placed in a try block. If an exception occurs, it is thrown and can be caught in an accompanying catch block. Finally blocks contain cleanup code that always executes whether an exception occurred or not. Exceptions are classified as either checked, which must be caught, or unchecked, which do not require catching but are good to handle for robust programs.
This document discusses exception handling in Java programming. It defines an exception as an unwanted event that interrupts normal program flow. Exceptions can be handled in Java to provide meaningful messages to users rather than system errors. The document covers checked and unchecked exceptions, try-catch blocks, multiple catch blocks, finally blocks, and throwing custom exceptions. It provides examples to illustrate exception handling concepts in Java.
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.
There are three main categories of exceptions in Java:
1. Checked exceptions must be handled by the programmer and cannot be ignored.
2. Unchecked exceptions occur during runtime due to programming errors. They can be ignored.
3. Errors are problems beyond the programmer's control, like stack overflows, and are also ignored.
Java uses five keywords to handle exceptions: try catches exceptions thrown within its block; catch handles caught exceptions; throw manually throws exceptions; throws declares exceptions a method may throw; and finally always executes regardless of exceptions. Programmers place exception-prone code in try blocks and use catch blocks to handle exceptions rationally.
The document discusses exceptions handling in Java. It begins by defining exceptions as unexpected events that occur during program execution and can terminate a program abnormally. It then discusses Java's exception hierarchy with Throwable at the root, and Error and Exception branches. Errors are irrecoverable while Exceptions can be caught and handled. It provides examples of different exception types like RuntimeException and IOException, and how to handle exceptions using try-catch blocks, the finally block, and throw and throws keywords. Finally, it provides a code example demonstrating try-catch-finally usage.
The document discusses different types of errors in Java including compile-time errors, run-time errors, and exceptions. It defines exceptions as events that disrupt normal program flow and describes Java's exception handling mechanism which includes throwing, catching, and handling exceptions using try, catch, throw, throws and finally keywords. The document also covers checked and unchecked exceptions, nested try blocks, and rethrowing and declaring exceptions using throws.
Better Builder Magazine brings together premium product manufactures and leading builders to create better differentiated homes and buildings that use less energy, save water and reduce our impact on the environment. The magazine is published four times a year.
Data Communication and Computer Networks Management System Project Report.pdfKamal Acharya
Networking is a telecommunications network that allows computers to exchange data. In
computer networks, networked computing devices pass data to each other along data
connections. Data is transferred in the form of packets. The connections between nodes are
established using either cable media or wireless media.
Cricket management system ptoject report.pdfKamal Acharya
The aim of this project is to provide the complete information of the National and
International statistics. The information is available country wise and player wise. By
entering the data of eachmatch, we can get all type of reports instantly, which will be
useful to call back history of each player. Also the team performance in each match can
be obtained. We can get a report on number of matches, wins and lost.
Sri Guru Hargobind Ji - Bandi Chor Guru.pdfBalvir Singh
Sri Guru Hargobind Ji (19 June 1595 - 3 March 1644) is revered as the Sixth Nanak.
• On 25 May 1606 Guru Arjan nominated his son Sri Hargobind Ji as his successor. Shortly
afterwards, Guru Arjan was arrested, tortured and killed by order of the Mogul Emperor
Jahangir.
• Guru Hargobind's succession ceremony took place on 24 June 1606. He was barely
eleven years old when he became 6th Guru.
• As ordered by Guru Arjan Dev Ji, he put on two swords, one indicated his spiritual
authority (PIRI) and the other, his temporal authority (MIRI). He thus for the first time
initiated military tradition in the Sikh faith to resist religious persecution, protect
people’s freedom and independence to practice religion by choice. He transformed
Sikhs to be Saints and Soldier.
• He had a long tenure as Guru, lasting 37 years, 9 months and 3 days
This is an overview of my current metallic design and engineering knowledge base built up over my professional career and two MSc degrees : - MSc in Advanced Manufacturing Technology University of Portsmouth graduated 1st May 1998, and MSc in Aircraft Engineering Cranfield University graduated 8th June 2007.
Online train ticket booking system project.pdfKamal Acharya
Rail transport is one of the important modes of transport in India. Now a days we
see that there are railways that are present for the long as well as short distance
travelling which makes the life of the people easier. When compared to other
means of transport, a railway is the cheapest means of transport. The maintenance
of the railway database also plays a major role in the smooth running of this
system. The Online Train Ticket Management System will help in reserving the
tickets of the railways to travel from a particular source to the destination.
Learn more about Sch 40 and Sch 80 PVC conduits!
Both types have unique applications and strengths, knowing their specs and making the right choice depends on your specific needs.
we are a professional PVC conduit and fittings manufacturer and supplier.
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Our main products include below:
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- For Australian and new Zealand market: AS/NZS 2053 PVC conduit and fittings.
- for Europe, South America, PVC conduit and fittings with ICE61386 certified
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2. Contents
What is an Exception ?
Error vs. Exception
Hierarchy of Java Exception classes
Java Exception Handling Keywords
Types of Exception in Java
Internal working of java try-catch block
Exception Handler
Java Multi Catch block
The Throws / Throw Keywords
The finally block
Common scenarios where exceptions may occur
Sequence of Events for throw
Checked Exceptions
Un-Checked Exceptions
User-defined Exceptions:
3. What is an exception?
Exception is an abnormal condition.
In java, exception is an event that disrupts the normal flow of the program. It is an
object which is thrown at runtime.
What is exception handling
Exception Handling is a mechanism to handle runtime errors such as ClassNotFound,
IO, SQL, Remote etc.
Advantage of Exception Handling
The core advantage of exception handling is to maintain the normal flow of the
application. Exception normally disrupts the normal flow of the application
that is why we use exception handling.
4. Error vs Exception
Errors: An error represents a
condition serious enough that
most reasonable applications
should not try to catch.
Virtual Machine Error
Out of memory
Stack overflow
Thread Death
Linkage Error
Exceptions: An error
which reasonable
applications should
catch.
Array index out of bounds
Arithmetic errors (divide by
zero
Null Pointer Exception
I/O Exceptions
6. Java Exception Handling Keywords
There are 5 keywords used in java exception handling.
Try : Java try block is used to enclose the code that might throw an exception. It must be used within
the method.
Java try block must be followed by either catch or finally block.
Catch : Java catch block is used to handle the Exception. It must be used after the try block only.
We can use multiple catch block with a single try.
Finally : Executes whether or not an exception is thrown in the corresponding try block or any of its
corresponding catch blocks.
Throw : You can throw an exception, either a newly instantiated one or an exception that you just
caught, by using the throw keyword.
Throws : If a method does not handle a checked exception, the method must declare it using
the throws keyword.
7. Types of Exception in Java
ArithmeticException
ArrayIndexOutOfBoundsException
ClassCastException
IllegalArgumentException
IndexOutOfBoundsException
NegativeArraySizeException
NullPointerException
NumberFormatException
NoSuchMethodException
8. Internal working of java try-catch block
int data = 10/0; Exception
object
An object of exception class is thrown
Is Handled ?
YES
NOJVM
1.Prints out exception
description
2.Prints the stack trace
3.Terminates the program
Rest of code
is executed
9. Exception Handler
Exception
"thrown" here
Exception
handler
Exception
handler
Thrown exception matched against
first set of exception handlers
Thrown exception matched against
first set of exception handlers
If it fails to match, it is matched against
next set of handlers, etc.
If it fails to match, it is matched against
next set of handlers, etc.
If exception matches none of handlers,
program is abandoned
If exception matches none of handlers,
program is abandoned
11. The Throws / Throw Keywords
If a method does not handle a checked exception, the method must
declare it using the throws keyword. The throws keyword appears at
the end of a method's signature.
You can throw an exception, either a newly instantiated one or an
exception that you just caught, by using the throw keyword.
***throws is used to postpone the handling of a checked exception
and throw is used to invoke an exception explicitly.***
import java.io.*;
public class className
{ public void deposit(double amount) throws RemoteException
{ // Method implementation
throw new RemoteException();
}
//Remainder of class definition
}
12. The finally block
The finally block follows a try block or a catch block. A finally block of code
always executes, irrespective of occurrence of an Exception.
Using a finally block allows you to run any cleanup-type statements that
you want to execute, no matter what happens in the protected code.
A finally block appears at the end of the catch blocks and has the following
syntax:
try
{ //Protected code
}catch(ExceptionType1 e1)
{ //Catch block }
catch(ExceptionType2 e2)
{ //Catch block }
finally { //The finally block always executes. }
13. Common scenarios where exceptions may occur
ArithmeticException occurs
int a=50/0; //ArithmeticException
NullPointerException occurs
String s=null;
System.out.println(s.length()); //NullPointerException
NumberFormatException occurs
String s="abc";
int i=Integer.parseInt(s); //NumberFormatException
ArrayIndexOutOfBoundsException occurs
int a[]=new int[5];
a[10]=50; //ArrayIndexOutOfBoundsException
14. Sequence of Events for throw
Preceding step
try block
throw
statement
unmatched catch
matching catch
unmatched catch
next step
15. Checked Exceptions
Inherit from class Exception but not from
RuntimeException
Compiler enforces catch-or-declare requirement
Compiler checks each method call and method
declaration
Checked exceptions are checked at compile-time.
e.g. IOException, SQLException etc.
16. Unchecked Exceptions
Inherit from class RuntimeException or class Error
Compiler does not check code to see if exception caught
or declared
If an unchecked exception occurs and not caught
- Program terminates or runs with unexpected results
Can typically be prevented by proper coding
17. User-defined Exceptions:
We can create your own exceptions in Java. Keep the following
points in mind when writing your own exception classes.
All exceptions must be a child of Throwable.
If you want to write a checked exception that is automatically
enforced by the Handle or Declare Rule, you need to extend the
Exception class.
If you want to write a runtime exception, you need to extend the
RuntimeException class.
We can define our own Exception class as below:
class MyException extends Exception{ }
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