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14.11.2014
Difference between throw and throws keyword with example in Java. Throw and Throws are the two keyword used in java for exception handling. Let us understand why and where to use throw and throws keyword, so as to understand the actual definition and difference between throw and throws. Now when another programmer wants to use play() function, he needs to call that method in try block and a catch block should be defined by the programmer to handle that exception.
If any method throws checked Exception as shown in below Example, than caller can either handle this exception by catching it or can re throw it by declaring another throws clause in method declaration.
The Throw clause can be used in any part of code where you feel a specific exception needs to be thrown to the calling method.
If a method is throwing an exception, it should either be surrounded by a try catch block to catch it or that method should have the throws clause in its signature. Below is a very simple example which explains the behavior of Throw, Throws, Try, Catch, Finally block in Java. The exception is caught by the first catch block whose associated exception class matches the class or a superclass of the thrown exception. If no matching catch block is found in the exception chain, the thread containing the thrown exception is terminated. The finally block after a try … catch statement is executed regardless whether an exception is caught or not.
Returning within a finally block breaks the exception chain to the invoker even for uncaught exceptions. Filed Under: Core Java and J2EE Tutorials and Tips, Eclipse IDE Tips and Tutorials, Latest Technology News, Tips and Tricks Tagged: finally block, interview, java, java interview questions, java throw, java throws, jvm, try catch blockEnjoyed this post? Be sure to subscribe to the Crunchify newsletter and get regular updates about awesome posts just like this one and more!


In the if block, an object of ArithmeticException is created and the message is passed to the constructor.
Everything is right, then what is the necessity to throw the exception in the main() method declaration?
Even though they look alike and used with exception handling mechanism only, they differ a lot in their meaning and usage. Some more discussion is available on printing exceptions messages in Java Exception Messages.
3When we use throw keyword as a part of method body, it is mandatory to the java programmer to write throws keyword as a part of method headingWhen we write throws keyword as a part of method heading, it is optional to the java programmer to write throw keyword as a part of method body. In the above example the avg() method throw an instance of ArithmeticException, which is successfully handled using the catch statement.
Any method capable of causing exceptions must list all the exceptions possible during its execution, so that anyone calling that method gets a prior knowledge about which exceptions to handle. NOTE : It is necessary for all exceptions, except the exceptions of type Error and RuntimeException, or any of their subclass. You can see in above example even if exception is thrown by the program, which is not handled by catch block, still finally block will get executed. To know this keyword, we should know about exception and why to handle exception, and how we can handle exception in java. Throw keyword is mostly used to throw the exception to raise user defined exception i.e if user define its own exception by extending the exception class, then that exception can be raise by only using throw keyword. Without the throws clause in the signature the Java JVM compiler does not know what to do with the exception. This can be done in a try … catch statement or by defining the exception in the method definition.


Claiming is nothing but informing the programmer about the potential problems that may arise while using the method. But almost every other method in the java library or even user defined may throw an exception or two. Throw keyword should be defined in either try catch block or the method should be defined using throws keyword. I recommend you to take more look on books which explains throw and throws keyword difference.
Apart from difference between final, finally and finalize, throw vs throws is one of the frequently asked Java interview question. The throws clause tells the compiler that this particular exception would be handled by the calling method. Program execution stops on encountering throw statement, and the closest catch statement is checked for matching type of exception. Using a finally block, lets you run any cleanup type statements that you want to execute, no matter what happens in the protected code. The NoBalanceException constructor calls the super class Exception constructor and passes the problem with super(). For any method that will “throw” an exception, it is mandatory that in the calling method, you use throws to list the exception thrown.



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