Is it possible in Java to catch two exceptions in the same catch block

Question

I need to catch two exceptions because they require the same handling logic  I would like to do something like   catch  Exception e  ExtendsRuntimeException re           common logic to handle both exceptions     Is it possible to avoid duplicating the handler code in each catch block

User · Answer

Java  lt   6 x just allows you to catch one exception for each catch block   try      catch  ExceptionType name       catch  ExceptionType name         Documentation      Each catch block is an exception handler and handles the type of   exception indicated by its argument  The argument type  ExceptionType    declares the type of exception that the handler can handle and must be   the name of a class that inherits from the Throwable class    For Java 7 you can have multiple Exception caught on one catch block   catch  IOException SQLException ex        logger log ex       throw ex      Documentation      In Java SE 7 and later  a single catch block can handle more than one   type of exception  This feature can reduce code duplication and lessen   the temptation to catch an overly broad exception    Reference  http   docs oracle com javase tutorial essential exceptions catch html

User · Answer

Before the launch of Java SE 7 we were habitual of writing code with multiple catch statements associated with a try block  A very basic Example    try        some instructions   catch ATypeException e      catch BTypeException e      catch CTypeException e        But now with the latest update on Java  instead of writing multiple catch statements we can handle multiple exceptions within a single catch clause  Here is an example showing how this feature can be achieved   try      some instructions   catch ATypeException BTypeException CTypeException ex       throw e      So multiple Exceptions in a single catch clause not only simplifies the code but also reduce the redundancy of code   I found this article which explains this feature very well along with its implementation  Improved and Better Exception Handling from Java 7 This may help you too

User · Answer

Java 7 and later  Multiple-exception catches are supported  starting in Java 7   The syntax is   try           stuff   catch  Exception1   Exception2 ex            Handle both exceptions     The static type of ex is the most specialized common supertype of the exceptions listed   There is a nice feature where if you rethrow ex in the catch  the compiler knows that only one of the listed exceptions can be thrown     Java 6 and earlier  Prior to Java 7  there are ways to handle this problem  but they tend to be inelegant  and to have limitations   Approach  1  try           stuff   catch  Exception1 ex         handleException ex     catch  Exception2 ex         handleException ex      public void handleException SuperException ex            handle exception here     This gets messy if the exception handler needs to access local variables declared before the try   And if the handler method needs to rethrow the exception  and it is checked  then you run into serious problems with the signature   Specifically  handleException has to be declared as throwing SuperException     which potentially means you have to change the signature of the enclosing method  and so on   Approach  2  try           stuff   catch  SuperException ex         if  ex instanceof Exception1    ex instanceof Exception2                handle exception        else            throw ex             Once again  we have a potential problem with signatures     Approach  3  try           stuff   catch  SuperException ex         if  ex instanceof Exception1    ex instanceof Exception2                handle exception            If you leave out the else part  e g  because there are no other subtypes of SuperException at the moment  the code becomes more fragile   If the exception hierarchy is reorganized  this handler without an else may end up silently eating exceptions

User · Answer

For Java  lt  7 you can use if-else along with Exception   try          common logic to handle both exceptions   catch  Exception ex        if  ex instanceof Exception1    ex instanceof Exception2               else           throw ex             or if you don t want to have to declare Exception use            throw new RuntimeException ex             Edited and replaced Throwable with Exception

User · Answer

If you aren t on java 7  you can extract your exception handling to a method - that way you can at least minimize duplication  try         try something   catch ExtendsRuntimeException e    handleError e     catch Exception e    handleError e

User · Answer

http   docs oracle com javase tutorial essential exceptions catch html covers catching multiple exceptions in the same block    try           your code   catch  Exception1   Exception2 ex            Handle 2 exceptions in Java 7     I m making study cards  and this thread was helpful  just wanted to put in my two cents

[java] Is it possible in Java to catch two exceptions in the same catch block?

Examples related to java

Examples related to exception-handling

Examples related to try-catch