What is difference between Errors and Exceptions

Question

Possible Duplicate    Differences betweeen Exception and Error       How can I differentiate between Errors and Exceptions in Java

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In general error is which nobody can control or guess when it occurs Exception can be guessed and can be handled  In Java Exception and Error are sub class of Throwable It is differentiated based on the program control Error such as OutOfMemory Error which no programmer can guess and can handle it It depends on dynamically based on architectire OS and server configuration Where as Exception programmer can handle it and can avoid application s misbehavior For example if your code is looking for a file which is not available then IOException is thrown Such instances programmer can guess and can handle it

User · Answer

Error is something that most of the time you cannot handle it      Exception was meant to give you an opportunity to do something with it  like try something else or write to the log   try      connect to database 1   catch DatabaseConnctionException err       connect to database 2     write the err to log

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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  amp  their subclasses are unchecked exceptions  All other Exception classes are checked exceptions   Checked exceptions are generally those from which a program can recover  amp  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 include ArrayIndexOutOfBoundException  ClassCastException  etc  Many applications will use try-catch or throws clause for RuntimeExceptions  amp  their subclasses but from the language perspective it is not required to do so  Do note that recovery from a RuntimeException is generally possible but the guys who designed the class exception deemed it unnecessary for the end programmer to check for such exceptions   Errors are also unchecked exception  amp  the programmer is not required to do anything with these  In fact it is a bad idea to use a try-catch clause for Errors  Most often  recovery from an Error is not possible  amp  the program should be allowed to terminate  Examples include OutOfMemoryError  StackOverflowError  etc    Do note that although Errors are unchecked exceptions  we shouldn t try to deal with them  but it is ok to deal with RuntimeExceptions also unchecked exceptions  in code  Checked exceptions should be handled by the code

User · Answer

Error and Exception both extend Throwable  but mostly Error is thrown by JVM in a scenario which is fatal and there is no way for the application program to recover from that error  For instance OutOfMemoryError   Though even application can raise an Error but its just not a good a practice  instead applications should use checked exceptions for recoverable conditions and runtime exceptions for programming errors

[java] What is difference between Errors and Exceptions?

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