Question $1$

Open the Exercise project $($the Exercise folder$).$

Complete the following by editing CourseCode.java

$($a$)$ Write a method addCourseCode$($String courseCode$)$ to add a new course code to the courseCodeSet attribute.

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$($b$)$ In main$()$ method, create a CourseCode object name courseCode. Add the following course code to the object.

COMP$1030$SEF

COMP$2020$SEF

COMP$3120$SEF

COMP

COMPSEF

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$($c$)$ Write a method printCourseCodeLevel$()$ to display the level of each course code stored in the courseCodeSet. The level is represented by an integer that located at the fifth character of the course code. For example, COMP$1030$SEF is a level $1$ course.

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Hint:

$-$ String method substring can be used to extract the course level in String type from the course code.

o$$ StringIndexOutOfBoundsException will be thrown if an index is either negative or greater than the size of the string.

$-$ Method Integer.parseInt can be used to convert the extracted course level into an integer.

o$$ NumberFormatException will be thrown if a string is converted to one of the numeric types, but it does not have the appropriate format.

$-$ Implement an exception handler in the method to handle the StringIndexOutOfBoundsException and NumberFormatException with a try$-$catch statement. If StringIndexOutOfBoundsException is caught, displays a message $$Improper course code length:$$ and the course code. If NumberFormatException is caught, displays a message $$Invalid course code format:$$ and the course code.

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$($d$)$ In main$()$ method, test the method printCourseCodeLevel$().$

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$----------$ Capture Output $----------$

COMP$1030$SEF: Level $1$

COMP$2020$SEF: Level $2$

COMP$3120$SEF: Level $3$

Improper course code length: COMP

Invalid course code format: COMPSEF

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