CODEWITHSUNDEEP
javac++
the_naive
the_naive

Reputation: 3064

why "throws exception" in java but not in c++?

I'm learning to use java, I think I already know the basics of C++. But, as I just started learning java, the first bits of 'hello world' program I noticed uses 'throws exception' when initiating the main function in the main class. Why is it used? Do we do something similar in c++? Is returning 0 in int type main function in c++ a similar thing?

Upvotes: 1

Views: 374

Answers (2)

James Kanze
James Kanze

Reputation: 153909

It isn't, or at least, I've never seen a main in Java which did it. I'm not even sure that it's legal. (Given the way Java uses exceptions, it shouldn't be. Only RuntimeException and Error should propagate out of main.)

Java tends to overuse exceptions; especially, it uses exceptions in cases where return values would be more appropriate (e.g. things like not being able to open a file). In a correct program, these exceptions must be handled (just as in a correct program, C++ returned error codes, or in the case of input and output, the stream state, must be handled). Java uses the exception specifier to declare these exceptions (and only these—it isn't necessary to declare things that would be an exception in C++).

Upvotes: 1

Rune Aamodt
Rune Aamodt

Reputation: 2611

In Java, specifying that a methodthrows SomeException means that any method calling that method will have to either catch or itself throw that exception. In the case of the main function, it just means that you don't have to catch any exceptions that may occur directly in the main method, they will instead be passed on to the underlying runtime, resulting in a stack trace print and program exit.

Upvotes: 2

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