**2.C] Write a note on:i) ordinal()ii) compareTo()**

Answer:

In Java, both `ordinal()`

and `compareTo()`

methods are commonly used with enumerations (`enum`

) but can also be applied in other contexts. Here’s a detailed explanation of each:

**i) **`ordinal()`

`ordinal()`

- The
`ordinal()`

method returns the position of an enum constant in its enum declaration. The first constant is assigned an ordinal value of`0`

, the second`1`

, and so on. This method is useful when you need to know the order of constants within an enum. **Syntax:**

enumName.constantName.ordinal()

**Example:**

enum Day { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY } public class OrdinalExample { public static void main(String[] args) { Day day = Day.WEDNESDAY; System.out.println("The ordinal of " + day + " is: " + day.ordinal()); } }

**Output:**

The ordinal of WEDNESDAY is: 3

- In the example above,
`WEDNESDAY`

is the fourth constant in the enum`Day`

, so its ordinal value is`3`

.

**ii) **`compareTo()`

`compareTo()`

- The
`compareTo()`

method is used to compare the ordinal values of two enum constants. It returns: `0`

if the two enum constants are the same.- A negative integer if the current enum constant’s ordinal is less than the compared enum constant’s ordinal.
- A positive integer if the current enum constant’s ordinal is greater than the compared enum constant’s ordinal.
**Syntax:**

enumName.constantName1.compareTo(enumName.constantName2)

**Example:**

enum Day { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY } public class CompareToExample { public static void main(String[] args) { Day day1 = Day.MONDAY; Day day2 = Day.WEDNESDAY; int result = day1.compareTo(day2); if (result == 0) { System.out.println(day1 + " is equal to " + day2); } else if (result < 0) { System.out.println(day1 + " comes before " + day2); } else { System.out.println(day1 + " comes after " + day2); } } }

**Output:**

MONDAY comes before WEDNESDAY

- In this example,
`MONDAY`

has an ordinal value of`1`

and`WEDNESDAY`

has an ordinal value of`3`

. Since`1 < 3`

, the`compareTo()`

method returns a negative integer, indicating that`MONDAY`

comes before`WEDNESDAY`

.

**Summary:**

provides the position of an enum constant within the enum declaration.`ordinal()`

compares the ordinal values of two enum constants to determine their order relative to each other.`compareTo()`

These methods are particularly useful for managing and organizing enums in Java.