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About Question enthuware.ocajp.i.v8.2.908 :
Posted: Fri Jan 01, 2016 5:54 am
by rezebric
The correct answer is "It will not compile." not the "Exception at run time."
Re: About Question enthuware.ocajp.i.v8.2.908 :
Posted: Fri Jan 01, 2016 9:06 am
by admin
I see that "It will not compile" is indeed marked as the correct answer. Please let me know if you see something else.
HTH,
Paul.
Re: About Question enthuware.ocajp.i.v8.2.908 :
Posted: Sat Aug 21, 2021 1:09 am
by dev_khaled
Hi, thank you for the great work. There is a bit misleading term in the explanation:
Item 4. All case labels should be COMPILE TIME CONSTANTS.
You cannot have variables as case labels.
The highlighted sentence is a bit misleading. As you can have
final variables with
values evaluated at compile time as a case labels.
Try the following code
Code: Select all
public class Main {
public static void main(String args[]) {
int full = Integer.parseInt("20");
// Next line causes compilation error because half's value cannot be evaluated at compile time!
// final int half = full/2;
// Next line causes compilation error because half is not final!
// int half = 10;
// Next line works perfectly! A final variable with value evaluated at compile time!
final int half = 5 * 2;
switch(full/2){
case half: System.out.println("Final variable can work with case label!");
}
}
}
or run it directly from
https://www.online-java.com/p1Bs95m8Yt
Suggestion: add clarification to the 2nd sentence
4. All case labels should be COMPILE TIME CONSTANTS. By either being a
Literal value. eg: 50 or a
Final variable whose value is evaluated at compile time. eg: final int someLabel = 5 * 2
Thank you.
Re: About Question enthuware.ocajp.i.v8.2.908 :
Posted: Sat Aug 21, 2021 4:53 am
by admin
You are right.
Explanation has now been enhanced.
thank you for your feedback!