Error Definition In Java
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Error Vs Exception In Java pramodbablad April 15, 2015 3 Both java.lang.Error and java.lang.Exception classes are sub classes of java.lang.Throwable class, but there exist some significant differences between them. definition of java class java.lang.Error class represents the errors which are mainly caused by the environment in which
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application is running. For example, OutOfMemoryError occurs when JVM runs out of memory or StackOverflowError occurs when stack overflows. Where definition of java array as java.lang.Exception class represents the exceptions which are mainly caused by the application itself. For example, NullPointerException occurs when an application tries to access null object or ClassCastException occurs when an application tries definition of java in computer terms to cast incompatible class types. In this article, we will discuss the differences between Error and Exception in java. Below is the list of differences between Error and Exception in java. Error Vs Exception In Java : 1) Recovering from Error is not possible. The only solution to errors is to terminate the execution. Where as you can recover from Exception by using
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either try-catch blocks or throwing exception back to caller. 2) You will not be able to handle the Errors using try-catch blocks. Even if you handle them using try-catch blocks, your application will not recover if they happen. On the other hand, Exceptions can be handled using try-catch blocks and can make program flow normal if they happen. 3) Exceptions in java are divided into two categories - checked and unchecked. Where as all Errors belongs to only one category i.e unchecked. Click here for more info on Checked and Unchecked Exceptions. 4) Compiler will not have any knowledge about unchecked exceptions which include Errors and sub classes of RunTimeException because they happen at run time. Where as compiler will have knowledge about checked Exceptions. Compiler will force you to keep try-catch blocks if it sees any statements which may throw checked exceptions. 5) Exceptions are related to application where as Errors are related to environment in which application is running. Below is the quick recap of above points. Errors Exceptions Errors in java are of type java.lang.Error. Exceptions in java are of type java.lang.Exception. All errors in java are unchecked type.
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Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join http://javaconceptoftheday.com/difference-between-error-vs-exception-in-java/ them; it only takes a minute: Sign up What is difference between Errors and Exceptions? [duplicate] up vote 69 down vote favorite 34 Possible Duplicate: Differences betweeen Exception and Error How can I differentiate between Errors and Exceptions in Java? java exception share|improve this question edited Apr 28 '11 at 4:31 Michael Petrotta 44.5k11108151 asked Apr 28 '11 at http://stackoverflow.com/questions/5813614/what-is-difference-between-errors-and-exceptions 4:24 hiren gamit 41331322 marked as duplicate by Bill the Lizard Apr 28 '11 at 11:23 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. add a comment| 4 Answers 4 active oldest votes up vote 95 down vote accepted An Error "indicates serious problems that a reasonable application should not try to catch." while An Exception "indicates conditions that a reasonable application might want to catch." Error along with RuntimeException & their subclasses are unchecked exceptions. All other Exception classes are checked exceptions. Checked exceptions are generally those from which a program can recover & it might be a good idea to recover from such exceptions programmatically. Examples include FileNotFoundException, ParseException, etc. A programmer is expected to check for these exceptions by using the try-catch block or throw it back to the caller On the other hand we have unchecked exceptions. These are those exceptions that might not happen if everything is in order, but they do occur. Examples
Method java.lang Class Error java.lang.Object java.lang.Throwable java.lang.Error All Implemented Interfaces: https://docs.oracle.com/javase/7/docs/api/java/lang/Error.html Serializable Direct Known Subclasses: AnnotationFormatError, AssertionError, AWTError, CoderMalfunctionError, FactoryConfigurationError, FactoryConfigurationError, IOError, LinkageError, ServiceConfigurationError, ThreadDeath, TransformerFactoryConfigurationError, VirtualMachineError public class Error extends Throwable An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch. definition of Most such errors are abnormal conditions. The ThreadDeath error, though a "normal" condition, is also a subclass of Error because most applications should not try to catch it. A method is not required to declare in its throws clause any subclasses definition of java of Error that might be thrown during the execution of the method but not caught, since these errors are abnormal conditions that should never occur. That is, Error and its subclasses are regarded as unchecked exceptions for the purposes of compile-time checking of exceptions. Since: JDK1.0 See Also:ThreadDeath, Serialized FormSee The Java™ Language Specification: 11.2 Compile-Time Checking of Exceptions Constructor Summary Constructors Modifier Constructor and Description Error() Constructs a new error with null as its detail message. Error(Stringmessage) Constructs a new error with the specified detail message. Error(Stringmessage, Throwablecause) Constructs a new error with the specified detail message and cause. protected