reviewing for exam lecture 12. lab 1 postfix.java –hexadecimal converting ‘a’ to number...

Reviewing for ExamReviewing for Exam

Lecture 12Lecture 12

Lab 1 • Postfix.java

– Hexadecimal• Converting ‘a’ to number• Converting ‘1’ to number

– System.exit(3);• Questions?

Lecture 1• Test cases for programs

• Documentation – Echo of input– Inline comments– Ending message– Javadocs

Lab 2• PseudoWar game

– Test cases– Stubs– Program

• Required– Constructors– Specific methods– Generation of number in range 1 to 52

Lab 3• Exception

– Handlers• Try• Catch

– printStackTrace()– getMessage()– Multiple handlers

– Avoiding

Lecture 3• Style guidelines• Chapter12 slides

Lab 4• Writing code from scratch

– Illustrating use of exception handlers – Illustrating avoidance of exceptions– Java Tutorial

– Java api

• ArithmeticException• ArrayIndexOutOfBoundsException• FileNotFoundException• PatternSyntaxException• ClassNotFoundException• InputMisMatchException• NullPointerException• NumberFormatException• StringIndexOutOfBoundsException• NegativeArraySizeException• ArrayStoreException• MalformedURLException• IOException• IllegalArgumentException• ClassCastExceptionIllegal• FormatConversionException

Lecture 4• Common Exceptions

– That can be avoided– That can not be avoided

• Reading from Files• Compile time errors • Runtime errors

Lab 5• File I/O

– PrintWriter (flush) – File– java.io package

• Use of command line arguments• Use of re-direct symbols

Lecture 5• Play with text examples

– Use of StringTokenizer– Use of delimiters– Use of regular expressions

• Correct use of Boolean in if and while statements

• How comments help

Lab 6• Enumerated types

• Enhanced for loop (i.e. for… each)

Lecture 6• public enum Sessions

{ SPRING, SUMMER, FALL ; }

public enum Planet { MERCURY (3.303e+23, 2.4397e6), VENUS (4.869e+24, 6.0518e6), EARTH (5.976e+24, 6.37814e6), MARS (6.421e+23, 3.3972e6), JUPITER (1.9e+27, 7.1492e7), SATURN (5.688e+26, 6.0268e7), URANUS (8.686e+25, 2.5559e7), NEPTUNE (1.024e+26, 2.4746e7);

… for (Planet p : Planet.values()) System.out.printf ("Your weight on %s is %f%n", p, p.surfaceWeight(mass));

Lab 7• Enumerated types again

– Rank– Suit– Card– Deck (?)

• Order • Valid elements• Attributes

for (Rank r : Rank.values()){ System.out.println ( r + " " + r.getBridgePoints() + " " + r.getAbbreviation() ); } // end for

Example for-each

Lecture 7• Chapter 9 – • Chapter_9_Part1.ppt slides• ClearJunk.java

Lab 8• Classes

– toString methods– equals methods

• when needed• how used

– static fields

Lecture 8• A few things

• Chapter 9 – rest of slides

Lab 9• UML diagram• Die objects

– getFaceValue– setFaceValue– toString– Roll– Math.random vs Random

Lecture 9• Talk about constructors

– belongs to class– do not have a visibility modifier– same name as class– may have no parameters (no-arg constructor)– may have one or more parameters (explicit

value constructor)– class may have no explicit constructor– class may have more than one constructor– doesn't return values

Lab 10• Code re-use• Array of objects• Explicit value constructors• No-arg constructors• Reading carefully

Lecture 10• Professor Harris lecture – see

blackboard

Lab 11• Designing classes• DISCUSSION

– Getters and setters are, in general, public methods. Since Fraction is immutable, shouldn’t have them.

– Fraction is 4/20 not .20– Numerator and denominator are ints

Lecture 11• Somewhat of a repetition of

lecture 10

Lab 12• Inheritance

– Employee• SalariedWorker• HourlyWorker

Lecture 12• Review

Lab 13• Specialization and Inheritance• DISCUSSION

– Needed to look at javadocs – Can’t compare one ampm to another

using == because they are Strings – need .equals

– An AlarmClock is-a Clock (a Clock is NOT an AlarmClock).