Java no name static method

Question

What is this?

public class ABC {
   public ABC() {
         System.out.println(\"world\");
   }
   static {
         System.out.println(\"hello\");
   }
}


        

Answer 1

I think it's worth noting the static block will be run exactly once each time a classloader loads a class. This means if you have more than one classloader, the block can execute more than once.

Answer 2

It's called a "static initialisation block".

It runs when the class is first loaded; only once.

For example, a constructor will run each time the class is instantiated; the static block only runs once, when it's first loaded statically by the VM/Class loader.