The Object class is the ultimate ancestor of all Java classes. : Object « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Object

If a class does not extend any class, the compiler builds a class that extends directly from Object.

public class MainClass {
  public static void main(String[] argv) {
    System.out.println();
  }
}

class MyClass {
}

class MyAnotherClass extends Object {
}