Enumeration and Nested Class

Question 1

Enumeration

Answer 1

A data type that contains a fixed set of constants

Question 2

Using an enum

Answer 2

Period p;
p = Period.{enum data}

Question 3

ordinal()

Answer 3

Returns an integers that represent constant’s position in the list of contants.

Question 4

you can pass an invalid value and not find
out until runtime

Answer 4

numeric or String constants

Question 5

With enums

Answer 5

it is impossible to create an invalid enum value
without introducing a compiler error

Question 6

toString()

Answer 6

Returns the name of the calling constant object

Question 7

static member class

Answer 7

has access to all static methods of the top-
level class

Question 8

Non-static member class (inner class

Answer 8

requires an instance; it has
access to all data and methods of the top-level class.

Question 9

Local class

Answer 9

defined within a method body Anonymous class – a special case of a local class that has not identifier

Question 10

valueOf()

Answer 10

Accepts a string parameter and returns an enumeration constant

Question 11

values()

Answer 11

Returns an array of the enumerated constants

Question 12

equals()

Answer 12

Returns true if its argument is
equal to the calling object’s
value

Question 13

compareTo()

Answer 13

the calling object’s ordinal value is less than that of the argument, 0 if they are the
same, and a positive integer if
the calling object’s ordinal value
is greater than that of the
argument