Introduktion till Java
Modul 1
Objektets delar
Fält
Metoder
Olika sorters metoder
Constructors
Destructors
Mutators (transformers)
Accessors
(Predicates)
1
Klasser och objekt
klass
objekt
C++ vs. Java
C++
Java
main()
main()
2
Traditionellt API vs. Java API
Traditionellt
Applikation
Språk
Operativsystem
Hårdvara
Med Java
Applikation
Java
Java Virtual Machine (JVM)
Operativsystem
Hårdvara
Standardiserade filnamn
<N am n>.java
K ällkod
<N am n>.class
B yteko d
Java V irtual M ach ine
3
http://java.sun.com
Kodningskonventioner
http://java.sun.com/docs/codeconv/
–
–
–
80% of the lifetime cost of a piece of software
goes to maintenance.
Hardly any software is maintained for its whole life
by the original author.
Code conventions improve the readability of the
software, allowing engineers to understand new
code more quickly and thoroughly.
Referenser till objekt
Java: ett sätt
objReference
attr1
method1()
objReference.attr1
objReference.method1()
objName.attr1
objName.method1()
C++: tre sätt !
objPointer
objName
objReference
attr1
method1()
(*objPointer).attr1
(*objPointer).method1()
objReference->attr1
objReference->method1()
4
