Singleton or static

gistfile1.java

Singleton:

public class Vertx {
  public static Vertx instance = new Vertx();

  private Vertx() {
  }

  public void foo() {
  }

  public void bar() {
  }

  public void quux() {
  }

}

Usage:

Vertx.instance.foo();
Vertx.instance.bar();
Vertx.instance.quux();

Static:

public class Vertx {
  
  public static void foo() {
  }

  public static void bar() {
  }

  public static void quux() {
  }

}

Usage:

Vertx.foo();
Vertx.bar();
Vertx.quux();

Which do you prefer? The static version is less verbose for the reader.