CS 239 – Review for Exam 1

Here is a lits of topics covered in class this semester which you are expected to know and on which you may be tested. Those in black were covered by both Adams and Harris: those in red only by Adams; those in blue only by Harris. You should therefore not expect to be tested on the red and blue items.

You should be able to trace code in which any of the following occur.

String class methods

Know how to use these and what they produce when they are used

.charAt()

.toCharArray()

.length()

Other classes used

Integer.parseInteger()

Double.parseDouble()

know the default type of a numeric value (i.e. numeric literal)

know the meaning of the following modifiers and when it is appropriate to use each

static

final

public

private

Loops – repetition control structures

for

foreach

do

while

selection control structures

if

if ... else

switch

use of boolean variables to control loops

using command line arguments – review program Calculator.java

Be sure you can write code to read from and write to files using the input and output classes we have discussed

input classes with their methods

Scanner

.nextInt()

.next()

.nextLine()

.hasNext()

new Scanner(System.in)

new Scanner (new File (<filename>))

BufferedReader - in Lab1

InputStreamReader - in Lab1

Stdin.readLine( ) - in Lab1

output classes with their methods

System.out.print ()

System.out.println ()

BufferedWriter

PrintWriter.print()

PrintWriter.println()

PrintWrite.close()

FileWriter

binary representation of decimal integers

array

declarations

initializers

item by item initialization

iterators

processing

.length

pre-defined constants

.MAX_VALUE

.MIN_VALUE

.SIZE

You should have encountered each of the following Exceptions

You should know at least one instance in which each of them might arise in a program.

FileNotFound

StringIndexOutOfBoundsException

ArrayIndexOutOfBoundsException

NumberFormatException

ArithmeticException

InputMismatchException

You should also know what happens when an exception is not caught

and how to create an exception. Review the code in the text on:

Propagating Exceptions

Creating Exceptions

try/catch blocks/finally

try/catch within FOR vs FOR within try/catch

javadocs

@author

@param

@return

/** problem description

*/

@throws

@exception

Given a page from the java API, you should be able to read and understand it and write code using it.

user defined types

enum

weakness is that values of this type can not be read YET!

immutability of

String objects

array objects

short circuit evaluation

use of deMorgan’s laws in negating a compound condition

UML diagrams

Objects

constructors

accessors

mutators

instance variables

· are variables that are associated with an instance of a class different instances of the class may have different values for these variables

class variables

· are static variables which means that they are shared by all instances of the class. A change made to one of them by one instance of the class changes the value that all instances see.

methods

signature

· consists of method name and formal parameter list

header

· consists of method name and formal parameter list plus a return type and modifiers (if any)