Compilation Error and Run time exception

[Bhasker Komandur]

I am having hard time to identify whether a query is a compilaiton error or run time exception. Is there any key points that I need to look for when identifying both

[Noam Wolf]

What do you mean by "query"? Can you post some code? The differences between compile time and run time exceptions are relatively easy to explain but I don't want to do that if you're confused only about a small piece of code...

[Bhasker Komandur]

I meant in general. I am from DB2 background and my hand typed query.

[Ninad Kulkarni]

First give the code then we try to solve it
Ok

Regards
Ninad

[Noam Wolf]

Well in (very) general:

Compile time error - is an error that your compiler will catch, or one that your compiler "knows" is incorrect. For example if you try to assign an incorrect type:

Integer myInteger = new ArrayList();

Your compiler complain that there is a type mismatch... so it's "saving you from yourself" or in other words pointing out any syntactic error that can be picked up from Java's grammar.

Runtime errors - these are errors that could not have been for foreseen before the application actually *ran* and therefore the error will be thrown at runtime, or when the application is executing. So a good example is if you have a method that does simple division and accepts two integers, it's quite possible that one of the integers passed will be 0 and if you try to divide by zero you'll get a runtime error. There was no way for Java to foresee that you will pass that value. (this is a dumb example but illustrates the point)

After you get past this I suggest you read more into the differences between checked and unchecked errors in java...

[Nadeem Khan]

Compiler errors can be defined as the errors arising in your code due to some incorrect syntax (encountered while parsing) OR something whose meaning/semantics is wrong and can be found out just by looking at the syntax ....whereas the problem in logic OR something which produces undesired/incorrect results while execution comes as Run time error


I hope that helps a bit!