In Java, as you may know, exceptions can be categorized into two: One that needs the throws clause or must be handled if you don’t specify one and another one that doesn’t. Now, see the following figure: In Java, you can throw anything that extends the Throwable class. However, you don’t need to specify a … Read more
catch an exception only if you can handle it in a meaningful way declare throwing the exception upward if it is to be handled by the consumer of the current method throw exceptions if they are caused by the input parameters (but these are more often unchecked)
The op is asking about the C# equivalent of Java’s throws clause – not the throw keyword. This is used in method signatures in Java to indicate a checked exception can be thrown. In C#, there is no direct equivalent of a Java checked exception. C# has no equivalent method signature clause. // Java – … Read more
throws : Used when writing methods, to declare that the method in question throws the specified (checked) exception. As opposed to checked exceptions, runtime exceptions (NullPointerExceptions etc) may be thrown without having the method declare throws NullPointerException. throw: Instruction to actually throw the exception. (Or more specifically, the Throwable). The throw keyword is followed by … Read more
void showfile() throws java.io.IOException <—– Your showfile() method throws IOException, so whenever you use it you have to either catch that exception or again thorw it. Something like: try { showfile(); } catch(IOException e) { e.printStackTrace(); } You should learn about exceptions in Java.