in java

$($Enhancing Class Date$)$ Modify class Date of Fig. $8\mathrm{.}7$ to perform error checking on the

initializer values for variables month, day and year $($currently it validates only the month

and day$).$ Provide a method nextDay to increment the day by one. Write a program that

tests method nextDay in a loop that prints the date during each iteration to illustrate that

the method works correctly. Test the following cases:

a$)$ incrementing into the next month and

b$)$ incrementing into the next year.

$($Enhancing Class Time$2)$ Modify class Time$2$ of Fig. $8\mathrm{.}5$ to include a tick method that

increments the time stored in a Time$2$ object by one second. Provide method

incrementMinute to increment the minute by one and method incrementHour to

increment the hour by one. Write a program that tests the tick method, the

incrementMinute method and the incrementHour method to ensure that they work

correctly. Be sure to test the following cases:

a$)$ incrementing into the next minute,

b$)$ incrementing into the next hour and

c$)$ incrementing into the next day $($i$.$e$.,11$:$59$:$59$ PM to $12$:$00$:$00$ AM$).$

$4.($Date and Time Class$)$ Create class DateAndTime that combines the modified Time$2$

class and the modified Date class of the previous question $3.$ Modify method

incrementHour to call method nextDay if the time is incremented into the next day.

Modify methods toString and toUniversalString to output the date in addition to

the time. Write a program to test the new class Date$-$AndTime. Specifically, test

incrementing the time to the next day.