Singleton instantiation

Question

Below show is the creation on the singleton object.

public class Map_en_US extends mapTree {

    private static Map_en_US m_instance;

    private Map_en_US         


        

Answer 1

How about this approach for eradicating the static block:

private static Map_en_US s_instance = new Map_en_US() {{init();}};

It does the same thing, but is way neater.

Explanation of this syntax:
The outer set of braces creates an anonymous class.
The inner set of braces is called an "instance block" - it fires during construction.
This syntax is often incorrectly called the "double brace initializer" syntax, usually by those who don't understand what is going on.

Also, note:
m_ is a naming convention prefix for instance (ie member) fields.
s_ is a naming convention prefix for class (ie static) fields.
So I changed the name of the field to s_....