JAVA HW

College Class :

$3$ Properties

private String name;

private int age;

private string major;

The rules have been established but has not been enforced by the college class. A scholar student's name and major must be non$-$null, the age of the scholar student must be at least $13,$ and the major of the scholar student must be one of the majors listed below:

public static final String $[]$ majors $=\{$

"Computer Engineering". "Mechanical Engineering",

"Electrical Engineering", "Biomedical Engineering",

"Chesical Engifieering", "Aefospace Engifeerifg",

"Civil Engineering", "Physics", "Math", $"8$ielogy",

"Chemistry", "Envifon#ental Science", "Robotics Engineering",

"Materials Science", "Nucleaf Engineefifg", "Biochemistry",

"Geology", "Astronomy", "Statistics", "Computer Development"

$\}$

Make sure to pass each exception an "error message" explaining why the exception happened. All of the exception constructors can receive a String as a parameter. Secondly, you should have $2$ methods in the College class should throw exceptions when they get invalid arguments.

an addOaToAge, method should throw an exception when passed a non$-$positive value.

$\}$

an majorChange method should throw an exception when passed an invalid major $($one that is

not in the list above$).$

$\}$

Also, make sure to pass each exception an "error message" explaining why the exception happened. All of the exceptions constructors can receive a string as a parameter. Finally, fill out the avAge method below, that receives $-$ an array of scholar students as a parameter and

returns, as a double, the average age of those scholar students. Watch out for the null Student objects. Your method should use a try and catch to avoid the NullPointerException caused by attempting to access the age of a null scholar student. Null scholar students should not count

towards the average age.