summarizer16fev16_Exceptions
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An exception is a problem that occurs during program execution. In Java, exceptions are represented by classes that extend the Throwable class and allow programmers to handle exceptions using try/catch blocks. There is a hierarchy of exception classes that reflect different types of errors. Methods can declare that they throw specific exception types, and try/catch blocks allow catching and handling exceptions at runtime.
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Exception handling basic
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.
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This document discusses exception handling in Java. It covers key concepts like exception classes, throwing and catching exceptions, creating custom exceptions, and best practices. Exception handling allows programs to gracefully deal with errors and exceptional conditions. The try-catch block is used to catch exceptions, and exceptions can be propagated or chained. Finally blocks ensure cleanup code is always executed. Custom exceptions should be named appropriately and provide useful messages. Exceptions should only be thrown and caught when needed to handle errors.
Exception handling in java
The document discusses exception handling in Java. It defines that an exception occurs when the normal flow of a program is disrupted, such as by invalid user input, missing files, or lost network connections. There are different types of exceptions including runtime exceptions, compile-time errors, and checked and unchecked exceptions. The document outlines the steps for handling exceptions which include finding the problem, informing of the error, getting error information, and taking corrective action. Common Java exceptions and an example of exception handling code in Java are also provided.
Exception handling in JAVA
The document discusses exception handling in Java. It defines exceptions as problems that disrupt normal program flow and defines exception handling as a mechanism to handle runtime errors. It describes different types of exceptions like checked exceptions, unchecked exceptions, and errors. It explains the exception hierarchy and how to use try, catch, and finally blocks to handle exceptions. Finally, it discusses user-defined exceptions, the throw keyword to explicitly throw exceptions, and the throws keyword to declare exceptions.
Exception handling in java
what is exception?
what is exception handling?
When occur Exception in a program?
Why we use exception handling macanisum?
explain try, catch, finally keywords.
try,catch and finally-Rules.
Types of Exception.
example of Some java Pre-defined /Built-in exception class.
User-defined Eceptions
Exception in java?
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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.
Exception handling in java
Exception handling in java,try and catch, finally block,nested catch and try block,what happen when exception raise in java,
Exception handling
JAVA EXCEPTION HANDLING
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
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Exception handling basic
There are three main categories of exceptions in Java:
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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.
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Exception handling in java
The document discusses exception handling in Java. It defines that an exception occurs when the normal flow of a program is disrupted, such as by invalid user input, missing files, or lost network connections. There are different types of exceptions including runtime exceptions, compile-time errors, and checked and unchecked exceptions. The document outlines the steps for handling exceptions which include finding the problem, informing of the error, getting error information, and taking corrective action. Common Java exceptions and an example of exception handling code in Java are also provided.
Exception handling in JAVA
The document discusses exception handling in Java. It defines exceptions as problems that disrupt normal program flow and defines exception handling as a mechanism to handle runtime errors. It describes different types of exceptions like checked exceptions, unchecked exceptions, and errors. It explains the exception hierarchy and how to use try, catch, and finally blocks to handle exceptions. Finally, it discusses user-defined exceptions, the throw keyword to explicitly throw exceptions, and the throws keyword to declare exceptions.
Exception handling in java
what is exception?
what is exception handling?
When occur Exception in a program?
Why we use exception handling macanisum?
explain try, catch, finally keywords.
try,catch and finally-Rules.
Types of Exception.
example of Some java Pre-defined /Built-in exception class.
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Exception in java?
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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.
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JAVA EXCEPTION HANDLING
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
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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.
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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.
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summarizer16fev16_Exceptions
- 2. An exception is a problem that occurs during the execution of a program.
- 3. In Java there a way to deal with those problems. Our friend, the Exception class.
- 4. There is an hierarchy of these “problems” classes. It reflects the different type of errors that can occur. https://docs.oracle.com/javase/7/docs/api/java/lang/package-tree.html We can create our own Exceptions classes to fulfil our own needs. They are classes and they extend from the Throwable class.
- 5. theTHROW
- 6. Methods can handle exceptions. (we will see that later) But if it does not handle an exception, the method must declare it, using the throws throws keyword in his signature.
- 7. Causes and types of exceptions
- 8. Some are caused by hardware resources.
- 9. Others by user error.
- 10. And many by a programmer error.
- 11. These are not exceptions at all, but problems that arise beyond the control of the user or the programmer. You can rarely do anything about an error. Errors
- 12. Runtime exceptions A runtime exception could eventually be avoided by the programmer. They are ignored at the time of compilation.
- 13. Checked exceptionsA checked exception is typically a user error or a problem that cannot be foreseen by the programmer. These are the ones we should catch.
- 14. theTRYCATCH
- 15. Methods can detect exceptions when they occur. For this we should use the try/catch block. It is placed around the code that might generate an exception.
- 16. You always have to declare the type of exception, but being an object, exceptions benefit from all the good things of polymorphism.
- 17. A try block can be followed by multiple catch blocks so you can catch different exceptions. Be careful with Throwable hierarchy, blocks work similar to switches.
- 18. thefinallykeyword A finally block of code always executes, whether or not an exception has occurred. No matter what happens in the protected code, it allows you to run any “cleanupish” code that you want to execute.
- 19. public String getMessage() Returns a detailed message about the exception. This message is initialized in the constructor. public String toString() Returns the name of the class concatenated with the result of getMessage(). methodsThrowableclass public Throwable getCause() Returns the cause of the exception as represented by a Throwable object. public void printStackTrace() Prints the result of toString() along with the stack trace to System.err, the error output stream.
- 21. Exceptionsfilipe jorge 16 fev 2016