Win a copy of The Business Blockchain this week in the Cloud forum!
  • Post Reply
  • Bookmark Topic Watch Topic
  • New Topic

HFSJ mock question doubt

 
Napu Sun
Ranch Hand
Posts: 33
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
The following is the mock question in HFSJ.

One of the options "the MyFunctions class may be used by EL even though it has a public constructor." In the book, this option is correct. The comment say "because EL ignores all instance methods, EL doesn't care that it's dealing with a concrete class"

Three things I don't understand:
1. the option itself (the part after "even though")
2. the comment for this option.
3. Still I don't know if EL can use a constructor

What do you think?
 
Christophe Verré
Sheriff
Posts: 14691
16
Eclipse IDE Ubuntu VI Editor
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
This question is about what kind of Java classes/methods can be used for EL functions. Here are the requirements for such functions :
  • The class specified in the TLD must be a public class, and must be specified using a fully-qualified class name (including packages).
  • The specified method must be a public static method in the specified class, and must be specified using a fully-qualified return type followed by the method name, followed by the fully-qualified argument types in parenthesis, separated by commas


  • About the things you don't understand :
  • 1. It is a mean to disturb you. You can use any public class, having a default constructor or not.
  • 2. Refer to the above requirements
  • 3. EL calls static functions, so the constructor is not used. The class is not even instantiated.

  •  
    • Post Reply
    • Bookmark Topic Watch Topic
    • New Topic