how can I finish this code $?$ public class CreateCourses $\{$

public static void main$($String$[]$ args$)$

$\{$

Scanner keyboard $=$ new Scanner$($System$.$in$)$;

ArrayList courses $=$ new ArrayList$<>()$;

$/*$

TODO $1$: write a while loop that iterates until user enters $"$N$"$ when asked whether they have a course to enter.

Within the loop, call the method getACourse, and add the course to the arraylist courses.

$*/$

System.out.println$("$Do you have a course to enter $($Y$,$N$)?")$;

String answer $=$ keyboard.nextLine$()$;

while $($answer$.$equals$("$Y$"))\{$

$//$ need to call the getACourse method

$//$ add the returned course to the array list course

System.out.println$("$Do you have a course to enter $($Y$,$N$)?")$;

answer $=$ keyboard.nextLine$()$;

$\}$

if $($courses$.$size$()==0)\{$

System.out.println$("$No courses entered."$)$;

return;

$\}$

printCourses$($courses$)$;

System.out.println$("$Enter a course name to search:"$)$;

String name $=$ keyboard.nextLine$()$;

Course c $=$ searchCourse$($courses$,$ name$)$;

if $($c$!=$ null$)\{$

System.out.println$("$Course found."$)$;

System.out.println$($c$)$;

$\}$ else $\{$

System.out.println$("$Course not found."$)$;

$\}$

$\}$

$/*$

$*$ getACourse method will prompt user to enter the information of a course,

$*$ create the course, and return the course. If the user$-$entered category is

$*$ incorrect, the method should return null.

$*$

$*$ @param keyboard the scanner that will be used to extract user inputs

$*$ @return the course created or null if the course category user enters is incorrect.

$*/$

public static Course getACourse$($Scanner keyboard$)\{$

$//$TODO $2$: complete the method definition

System.out.println$("$Enter CRN number:"$)$;

System.out.println$("$Enter course category:"$)$;

System.out.println$("$Enter course name:"$)$;

return null;

$\}$

$/*$

$*$ printCourses will print the courses stored in an array list.

$*$

$*$ @param list the array list that contains the courses

$*/$

public static void printCourses$($ArrayList list$)\{$

$//$TODO $3$: define the method

$//$ need loop

$\}$

$/*$

$*$ searchCourse will search the array list for a course of a given name

$*$

$*$ @param list the array list that contains the courses

$*$ @param name a course name

$*$ @return the course with the name. If not found, return null.

$*/$

public static Course searchCourse$($ArrayList list, String name$)\{$

$//$TODO $4$: define the method

$//$ need loop

return null;

$\}$

$\}$