Consider the following snippet: Here I am trying to understand how to interpret these two statements Expression:1 Here we say that the List on the RHS must be such that all the elements of the list will satisfy the condition ? super List<? super Integer> but doubleList / integerList / numberList are not…
Tag: jls
Unchecked Cast warning – shows up for Type parameters but not for Concrete types?
Consider the following snippet: From what I understand – whenever we convert Supertype -> Subtype Unchecked cast is flagged as the compiler does not know until the runtime if the type represented by the Supertype will ever match the SubType. Then over here – why is (Double) (Number)a not being …
Where is the description of Constant Folding in the Java Language Specification, Java SE 11 Edition (JLS SE 11)?
As far as I know, Java deals with constant variables §4.12.4 by constant folding in compile time. I’ve tried my best, but I couldn’t find its description from JLS. Could anybody tell me where I could find official description of the constant folding process for Java 11? Answer The specification do…
Why can’t we access static content via uninitialized local variable?
Take a look at below code: As you see while trying to access static field x via an uninitialized local variable Foo foo; code foo.x generates compilation error: Variable ‘foo’ might not have been initialized. It could seem like this error makes sense, but only until we realize that to access a sta…