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You can not define attributes within a constructor, or any method for that matter.
Attributes of a class can only be defined outside of methods.

With the second approach you are not supposed to...

Thats not quite how the singleton pattern works.
Here, take a look at this example, maybe it can help you:

Our singleton

public class Config {

public static final Config INSTANCE = new...

What your "controller" classes are depends on your application.
There exists a certain programming paradigm which is called Model-View-Control (MVC). The idea is, that your classes are loosely...

This way you still keep the variable totalAttributes. It will forever stay in your memory as a package-private static variable of your Globals class.

By the way, a class like this is heavily...

Just so you know, the variable TOTAL_ATTRIBUTE_VALUES is NOT a constant at this point.
Its value can still be changed at any point in time.

If you want it to be a constant you need to do a little...

Several problems here:

int totalAttributes;
for( int value : attributesFinal ) {
totalAttributes =+ value;
}
public static int TOTAL_ATTRIBUTE_VALUES = totalAttributes;
First of all,...