Java no name static method

java static-methods
AEIOU picture AEIOU · Dec 2, 2009 · Viewed 8.6k times · Source

What is this?

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

Will print: hello world

I don't really understand this, or what kind of method that static code is.

Answer

Noon Silk picture Noon Silk · Dec 2, 2009

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.

Related questions

When to use static methods

I am wondering when to use static methods? Say if I have a class with a few getters and setters, a method or two, and I want those methods only to be invokable on an instance object of the class. …

Read More
Cannot make a static reference to the non-static method

Building a multi-language application in Java. Getting an error when inserting String value from R.string resource XML file: public static final String TTT = (String) getText(R.string.TTT); This is the error message: Error: Cannot make a static reference …

Read More
Why can't I define a static method in a Java interface?

EDIT: As of Java 8, static methods are now allowed in interfaces. Here's the example: public interface IXMLizable<T> { static T newInstanceFromXML(Element e); Element toXMLElement(); } Of course this won't work. But why not? One of the possible issues …

Read More