Is there a best practice for writing maps literal style in Java?

Question

In short, if you want to write a map of e.g. constants in Java, which in e.g. Python and Javascript you would write as a literal,

T CON         


        

Answer 1

I like to do it this way:

Map map = new HashMap() {{
    put("foo", "bar");
    put(123, 456);
}};

The double {{ }} are an instance initialization block. They are a bit unusual but they are useful. No need for libraries or helpers.