Difference between try-catch and throw in java

Question

What is the difference between try-catch and throw clause  When to use these   Please let me know

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Others have already given thorough answers  but if you re looking for even more information  the Oracle Java tutorials are always a good resource  Here s the Java tutorial for Exceptions  which covers all of your questions in great detail  https   docs oracle com javase tutorial essential exceptions index html

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If you execute the following example  you will know the difference between a Throw and a Catch block   In general terms   The catch block will handle the Exception  throws will pass the error to his caller   In the following example  the error occurs in the throwsMethod   but it is handled in the catchMethod     public class CatchThrow    private static void throwsMethod   throws NumberFormatException       String  intNumber    5A        Integer parseInt intNumber      private static void catchMethod         try            throwsMethod           catch  NumberFormatException e            System out println  Convertion Error              public static void main String   args           TODO Auto-generated method stub      catchMethod

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The try block will execute a sensitive code which can throw exceptions The catch block will be used whenever an exception  of the type caught  is thrown in the try block The finally block is called in every case after the try catch blocks  Even if the exception isn t caught or if your previous blocks break the execution flow  The throw keyword will allow you to throw an exception  which will break the execution flow and can be caught in a catch block   The throws keyword in the method prototype is used to specify that your method might throw exceptions of the specified type  It s useful when you have checked exception  exception that you have to handle  that you don t want to catch in your current method      Resources     oracle com - Lesson  Exceptions     On another note  you should really accept some answers  If anyone encounter the same problems as you and find your questions  he she will be happy to directly see the right answer to the question

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try block contains set of statements where an exception can occur  catch block will be used to used to handle the exception that occur with in try block  A try block is always followed by a catch block and we can have multiple catch blocks  finally block is executed after catch block  We basically use it to put some common code when there are multiple catch blocks  Even if there is an exception or not finally block gets executed  throw keyword will allow you to throw an exception and it is used to transfer control from try block to catch block  throws keyword is used for exception handling without try  amp  catch block  It specifies the exceptions that a method can throw to the caller and does not handle itself     Java program to demonstrate working of throws  throw  try  catch and finally   public class MyExample                   static void myMethod   throws IllegalAccessException                         System out println  quot Inside myMethod    quot                 throw new IllegalAccessException  quot demo quot                                  This is a caller function           public static void main String args                            try                    myMethod                                catch  IllegalAccessException e                     System out println  quot exception caught in main method  quot                               finally                    System out println  quot I am in final block  quot                                      Output  Inside myMethod    exception caught in main method  I am in final block

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In my limited experience with the following details throws is a declaration that declares multiple exceptions that may occur but do not necessarily occur  throw is an action that can throw only one exception  typically a non-runtime exception  try catch is a block that catches exceptions that can be handled when an exception occurs in a method this exception can be thrown An exception can be understood as a responsibility that should be taken care of by the behavior that caused the exception  rather than by its upper callers  I hope my answer will help you

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Try catch and throw clause are for different purposes  So they are not alternative to each other but they are complementary     If you have throw some checked exception in your code  it should be inside some try catch in codes calling hierarchy   Conversely  you need try catch block only if there is some throw clause inside the code  your code or the API call  that throws checked exception     Sometimes  you may want to throw exception if particular condition occurred which you want to handle in calling code block and in some cases handle some exception catch block and throw a same or different exception again to handle in calling block

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try - Add sensitive code catch - to handle exception finally - always executed whether exception caught or not  Associated with try -catch  Used to close the resource which we opened in try block throw - To handover our created exception to JVM manually  Used to throw customized exception  throws - To delegate the responsibility of exception handling to caller method or main method

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All these keywords try  catch and throw are related to the exception handling concept in java  An exception is an event that occurs during the execution of programs  Exception disrupts the normal flow of an application  Exception handling is a mechanism used to handle the exception so that the normal flow of application can be maintained  Try-catch block is used to handle the exception  In a try block  we write the code which may throw an exception and in catch block we write code to handle that exception  Throw keyword is used to explicitly throw an exception  Generally  throw keyword is used to throw user defined exceptions   For more detail visit Java tutorial for beginners

[java] Difference between try-catch and throw in java

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