:/tmp% cat Foo.java
class Obj {
  public Obj () {
    System.out.println ("public Obj ()");
  }
}

class Foo {
  private Obj o = new Obj ();

  public Foo() {
    System.out.println("public Foo ()");
  }

  public static void main(String[] args) {
    new Foo();
  }
}
:/tmp% javac Foo.java
:/tmp% java Foo
public Obj ()
public Foo ()
:/tmp%