Do you use this keyword or throw some validation runtime exception? What benefits it gives to you or why you think it's not worth to use?
Thanks.
Effective Java (Second Edition), Item 4, discusses using private constructors to enforce noninstantiability. Here's the code sample from the book:
public final class UtilityClass {
private UtilityClass() {
throw new AssertionError();
}
}
However, AssertionError doesn't seem like the right thing to throw. Nothing is being "asserted", which is how the API defines the use of Ass...
Java's checked exceptions sometimes force you to catch a checked exception that you believe will never be thrown. Best practice dictates that you wrap that in an unchecked exception and rethrow it, just in case. What exception class do you wrap with in that case?
What exception would you wrap with in the "// Should never happen" case?
most of the time i will use exception to check for condition in my code, i wonder when is appropriate time to use assertion
for instance,
Group group=null;
try{
group = service().getGroup("abc");
}catch(Exception e){
//i dont log error because i know whenever error occur mean group not found
}
if(group !=null)
{
//do something
}
1.can comment on this code and how assertion fit in here ...
I want to throw a runtime exception in case my class invariants are invalidated. Since this is a programming error (similar to a NullPointerException), clients should not catch that exception.
Should the exception class be declared private or public (or something else)?
class Foo
{
// ...
private static class InvariantsViolated
{
// ...
}
}
Are there any guidelines ...
What exactly happens when a Java assertion fails? How does the programmer come to know that an assertion has failed?
Thanks.
In Java, I will occasionally throw an AssertionError directly, to assert that a particular line will not be reached. An example of this would be to assert that the default case in a switch statement cannot be reached (see this JavaSpecialists page for an example).
I would like to use a similar mechanism in .Net. Is there an equivalent exception that I could use? Or is there another method tha...
i am reading assertions in java.i have material and i had seen some e - material too about assertions.But i am not able to get the main theme why we are using assertions and what it will do.can any one explain to me in general statements?
In the class I am testing, there are a few assert statements that check for various conditions.
One of the methods is
GetNames(string id){
assert(! id.Equals("")); // Causes all junit tests to stop
...
}
and there is an assert statement to check if id is not blank.
In my unit tests, I have one test where I pass it a blank string, and a few others. The problem is that when the ass...
