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How can I simulate busy waiting in Java threads without using suspend();, wait(); notify(), and notifyAll()?

I have been Asked to a java program that display the following output using the conditional control statement :.

.The Output :.

@
@ @
@ @ @
@ @ @ @
@ @ @ @ @
@ @ @ @ @ @
@ @ @ @ @
@ @ @ @
@ @ @
@ @
@

Thats All .

You are going to create a Robot class. I will put a file on the
website (with the other exampels from class) of a skeleton this class,
that is a file with the names of the various instance variables, methods,
and constructors, but with none of the actual code filled in. You are
to complete and test the class.

1. Develop a set of classes for a college to use in various student service and personnel applications. Classes need to design include the following:
1.1 Person- A person contains a first name, last name, street address, zip code and phone number. The class also includes a method that sets each data field, using a series of dialog boxes and a display method that displays the entire Person’s information on a single line at the command line on the screen. (9)
1.2 CollegeEmployee- CollegeEmployee descends from Person. A CollegeEmployee also includes a Social Security number, an annual salary, and a department name, as well as methods that override the Person methods to accept and display all CollegeEmployee data. (9)
1.3 Faculty-Faculty descends from CollegeEmplyee. This class also includes a Boolean field that indicates whether the Faculty member is tenured, as well as methods that override the CollegeEmployee methods to accept and display this additional piece of information. (9)
1.4 Student- Student descends from Person. In addition to the fields available in Person, a Student contains a major field of study and a grade point average as well as methods that override the Person methods to accept and display these additional facts. (8)
Write an application named CollegeList that declares an array of four “regular” CollegeEmployees, three Faculty, and seven Students. Prompt the user to specify which person’s data will be entered (‘C’, ‘F’, ‘S’), or allow the user to quit (‘Q’). While the user chooses to continue (that is, does not quit), accept data entry for the appropriate type of Person. If the user attempts to enter data for more than four CollegeEmployees, three Faculty, or seven Students, displays an error message. When the user quits, display a report on the screen listing each group of Persons under the appropriate heading “College Employees,” “Faculty,” or “Students”. If the user has not entered data for one or more type of Persons during session, display an appropriate message under the appropriate heading.
Save the files as Person.java, CollegeEmployee.java, Faculty.java, Student.java and CollegeList.java

write aprogram that prompts the user to enter a point (x,y)and checks whether the point is within the circle centered at (0,0)is radius 10

7. Write a program that accepts the value of (x, y) x-coordinates and y-coordinates and output its equivalent quadrant, if x = 0, its lies on the x axis, , if y = 0, its lies on the y axis, and if (0,0) origin.

(1) A=Pi*r^2
(2) C=n!/r!(n-r)!

Describe the main types of collection, their interfaces, and one example class
implementing each type.

I am using a Class (Named Tutor) outside of my main, while I am able to put a First and Last name into an Array and print them back out, when i try to sort the Array using Arrays.sort(nameOfArray); I get the exception Exception in thread "main" java.lang.ClassCastException: Tutor cannot be cast to java.lang.Comparable. I Want to try and sort all names by Last name in the Array.

Write a program that determines the class of the ship depending on it's class id(identifiers).