Final Exam Information

Time: Wednesday, May 12, 5:05-7:05pm

Place: 1221 Computer Science

Bring: Your student ID and some pencils

What’s the exam format?

The format will be the same as before. It will focus heavily on the last three topics (files, arrays, inheritance) and on the last two assignments. Almost anything about earlier topics will use them in the context of the new topics.

How can you prepare?

Looking over things we’ve done is a good idea for the true/false and multiple choice questions. Remember that just looking over things doesn’t help you write code, though. The only way to prepare for writing code is to practice writing it. Here are some suggestions for studying:

• Do the review exercises on the back.
• Write out definitions for each term below.
• Go over your class notes, especially the in-class exercises.
• Go through the recent quizzes on our website, and take turns explaining the answers.
• Redo some of the lab exercises from scratch (especially the Palette one), and check your answers.

Terms:

token

delimiter

append to a file

flush to a file

file path

array

array index

array entry

array length

initializer list

multi-dimensional array

ragged array

variable-length array

inheritance

superclass

subclass

ancestor class

descendant class

sibling class

unrelated class

member visibility

protected

default constructor

polymorphism

dynamic binding

instanceof operator

method signature

method prototype

overloading

overriding

interface

abstract

implements

extends

1) Suppose you have the following:

Point[] array = new Point[10];

· What variable types exist here?

· Rewrite the code above in several legal ways that have the same effect.

· Write a line of code that would cause an ArrayOutOfBoundsException.

· Write a line of code that would cause a NullPointerException.

· Write the value of this expression: array.length

· Write a method to which you could pass this array to fill it all up, so that the i^th point has coordinates (i,i).

2) Suppose you have the following:

Vehicle wheels = new Truck();

wheels.drive();

• For this to be legal code, what must be true?

• What class must the drive method be in? (This is a trick question.)

• Write the value of this expression: (wheels instanceof Truck)

• Would it be possible for Truck to be an abstract class? What about Vehicle?

3) Suppose you have this method: protected int f() { … }

• Which of the following methods overrides f?

protected double f() { … }

private int f(int x) { … }

public int f() { … }

• Which of the following methods overloads f?

public int f() { … }

private double f(int x) { … }

protected char f() { … }