Day 10 - Inner class

Which is true about an anonymous inner class?

• 
  It can extend exactly one class and implement exactly one interface.

• It can extend exactly one class and can implement multiple interfaces.

• It can extend exactly one class or implement exactly one interface.

• 
  It can implement multiple interfaces regardless of whether it also extends a class.

Which statement is true about a static nested class?

• You must have a reference to an instance of the enclosing class in order to instantiate it.

• It does not have access to nonstatic members of the enclosing class.

• It's variables and methods must be static.

• 
  It must extend the enclosing class.

class Foo 
{
    class Bar{ }
}
class Test 
{
    public static void main (String [] args) 
    {
        Foo f = new Foo();
        /* Line 10: Missing statement ? */
    }
}
which statement, inserted at line 10, creates an instance of Bar?

• Foo.Bar b = new Foo.Bar();

• Foo.Bar b = f.new Bar();

• Bar b = new f.Bar();

• Bar b = f.new Bar();

public class MyOuter 
{
    public static class MyInner 
    {
        public static void foo() { }
    }
}
which statement, if placed in a class other than MyOuter or MyInner, 
instantiates an instance of the nested class?

• MyOuter.MyInner m = new MyOuter.MyInner();

• MyOuter.MyInner m = new MyOuter.MyInner();

• MyOuter m = new MyOuter();

  MyOuter.MyInner mi = m.new MyOuter.MyInner();

• MyOuter m = new MyOuter();

  MyOuter.MyInner mi = m.new MyOuter.MyInner();

Which among the following best describes a nested class?

• Class inside a function

• Class inside a package

• Class inside a structure

• Class inside a class