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Oct 15, 2010 · 2. throw - It is used to throw an Exception.The throw statement requires a single argument : a throwable class object. throws - This is used to specifies that the method can throw exception. Throwable - This is the superclass of all errors and exceptions in the Java language. you can throw only objects that derive from the Throwable class ...
Throwable is the top of the hierarchy of things that can be thrown and is made up of Exceptions and Errors. Since Errors by definition arise from unsalvagable conditions, it is pointless to include them in your method declaration. That leaves just Exception. You should declare your method with throws Exception instead.
Mar 17, 2011 · And if you do want to use interrupt() to terminate the dispatcher, you certainly don't want to throw it; simply return from run() -- unless, of course, your dispatcher isn't the only thing that thread is doing, but even there, you almost certainly don't want to blindly throw. –
By default, Java 8 Function does not allow to throw exception and as suggested in multiple answers there are many ways to achieve it, one way is: @FunctionalInterface. public interface FunctionWithException<T, R, E extends Exception> {. R apply(T t) throws E; }
In Java 8 and JUnit 5 (Jupiter) we can assert for exceptions as follows. Using org.junit.jupiter.api.Assertions.assertThrows. public static < T extends Throwable > T assertThrows (Class< T > expectedType, Executable executable) Asserts that execution of the supplied executable throws an exception of the expectedType and returns the exception.
You should either: Catch the exception and handle it; in which case the throws is unnecesary. Remove the try/catch; in which case the Exception will be handled by a calling method. Catch the exception, possibly perform some action and then rethrow the exception (not just the message) answered Dec 8, 2010 at 21:32. Damo.
But the Java compiler won't let me do that and suggests that I surround it with try/catch. The problem is that by surrounding it with a try/catch I make that particular run() useless. I do want to throw that exception. If I specify throws for run() itself, the compiler complains that Exception is not compatible with throws clause in Runnable.run().
May 22, 2011 · Catching Throwable is sometimes necessary if you are using libraries that throw Errors over-enthusiastically, otherwise your library may kill your application. However, it would be best under these circumstances to specify only the specific errors thrown by the library, rather than all Throwables.
Throwable catches really everything even ThreadDeath which gets thrown by default to stop a thread from the now deprecated Thread.stop() method.
The rule is: be as specific as you can when catching exceptions - that means for example catching Exception instead of Throwable, and IOException instead of Exception. Don't catch Errors - errors are bugs. Fix the code instead. If you have to catch absolutely everything, use "catch Throwable", but this is bad form.
