Vet Clinic Exercise Not in notes What is cheating, again? We - - PowerPoint PPT Presentation

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Sep 10, 2022 27 likes •118 views

Vet Clinic Exercise Not in notes What is cheating, again? We encourage you to talk to fellow students about assignments but you must write your code individually . Good rule of thumb: if you don't take notes during a Not in notes

SLIDE 1

Not in notes

Vet Clinic Exercise

SLIDE 2

Not in notes

What is cheating, again?

We encourage you to talk to fellow students about

assignments but you must write your code individually.

Good rule of thumb: if you don't take notes during a

discussion about assignments, the code you write is truly your own.

If you didn't write your code yourself from scratch,

you're cheating.

The consequences of getting caught are significant and not

worth the risk: grade of 0 for course, reprimand on official transcript, etc...

SLIDE 3

Not in notes

Unit 10: exception handling and file I/O

Today: broad overview of exceptions and try-catch blocks (don't worry about the details) Friday: More details about exceptions, and we begin File I/O...

SLIDE 4

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Computer Science is...

Data Mining

Extracting patterns from huge amounts of data.

Statistical analysis
Data collection and

pre-processing

Used for marketing, fraud

detection, scientific discovery.

Privacy concerns!

(Web 2.0 companies are really into data mining.)

SLIDE 5

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Exception in thread "main" java.lang.NullPointerException at VetClinicTest.main(VetClinicTest.java:7) Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 at VetClinicTest.main(VetClinicTest.java:8)

We have caused lots of exceptions so far in this course

SLIDE 6

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Exceptions can be “thrown” in at least 2 ways

You do something silly in your code so that

your program crashes

The user of your program does something

silly so that your program crashes.

e.g. You ask them to enter an int and they enter a

letter.

SLIDE 7

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There are several ways to deal with exceptions

Fix your code so that the exception can't

possibly occur anymore

This is what we have been doing so far.
Describe what your program should do if an

exception occurs by adding a try/catch block to your code.

SLIDE 8

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Good programming practice: separate error identification from error handling

Suppose m1 is a method that calls another method m2:

m1 does no try to figure out which errors can possibly

come up due to calling m2.

Instead, m2 passes on error information its caller, m1.
The caller, m1, handles any error information that it is

provided with by m2.

This is why Java has exceptions: exceptions are

automatically passed from a method to its callers.

SLIDE 9

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To do for Friday

Read “official” slides on exceptions and file I/O

http://www.cs.mcgill.ca/~cs202/2010-

09/lectures/main/unit-10/10--exceptions.pdf

http://www.cs.mcgill.ca/~cs202/2010-

Vet Clinic Exercise

What is cheating, again?

assignments but you must write your code individually.

discussion about assignments, the code you write is truly your own.

you're cheating.

Unit 10: exception handling and file I/O

Computer Science is...

Data Mining

Extracting patterns from huge amounts of data.

pre-processing

detection, scientific discovery.

We have caused lots of exceptions so far in this course

Exceptions can be “thrown” in at least 2 ways

your program crashes

silly so that your program crashes.

letter.

There are several ways to deal with exceptions

possibly occur anymore

exception occurs by adding a try/catch block to your code.

Good programming practice: separate error identification from error handling

come up due to calling m2.

provided with by m2.

automatically passed from a method to its callers.

To do for Friday

Read “official” slides on exceptions and file I/O

09/lectures/main/unit-10/10--exceptions.pdf

09/lectures/main/unit-10/10--io.pdf