CSE115: Introduction to Computer Science I Dr. Carl Alphonce 219 Bell Hall

Announcements Advice –take notes in lecture –don’t rely only on slides –REVIEW notes regularly –bring notes to recitation Web-CAT –we’re tweaking it –don’t worry if you get about regrading

Agenda Brief review Unified Modeling Language (UML) Methods in general

BRIEF REVIEW

Object class instantiation created by ‘new’ + constructor representation stored on heap

Reference an address value of ‘new’ expression

Variable name location type value scope lifetime local variable instance variable

Expression examples of expressions –‘new’ expression –variable expression (on RHS of assignment) example1.Terrarium t1; example1.Terrarium t2; t1 = new example1.Terrarium(); t2 = t1;

package organizational mechanism each class belongs to a package

class “blueprint” of an object

constructor used by new to initialize a new object

scope static property of variable part of program text where a variable declaration holds

lifetime runtime property of variable period of time during which variable exists in memory

UML Unified Modeling Language –industry standard Class diagrams

UML Unified Modeling Language –express design without reference to an implementation language For example

Binary Class Relationships: directional binary  two classes are involved –source class has code modification –target class does not composition –source: WHOLE –target: PART in diagram: –line decoration is on source/WHOLE –show only detail that’s needed/desired

package cse115; public class Dog { public Dog() { } package cse115; public class Tail { public Tail() { }

package cse115; public class Dog { private Tail _tail; public Dog() { _tail = new Tail(); } package cse115; public class Tail { public Tail() { }