What is Double Brace initialization in Java?

Question

What is Double Brace initialization syntax ({{ ... }}) in Java?

Answer 1

For a fun application of double brace initialization, see here Dwemthy’s Array in Java.

An excerpt

private static class IndustrialRaverMonkey
  extends Creature.Base {{
    life = 46;
    strength = 35;
    charisma = 91;
    weapon = 2;
  }}

private static class DwarvenAngel
  extends Creature.Base {{
    life = 540;
    strength = 6;
    charisma = 144;
    weapon = 50;
  }}

And now, be prepared for the BattleOfGrottoOfSausageSmells and … chunky bacon!