HFSJ mock question doubt

[Napu Sun]

The following is the mock question in HFSJ.

  
package com.example;
public class MyFunctions {
   private int x;
   public MyFunctions() {
       x=0;
   }
 
   public int modX(int y) {
       return (y mod x); 
   }
   public static int funct(int x, int y) {
       return (2*x+y-5);
   }
}
which are true about EL functions?
 

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]

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.