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Samenvatting Programmeren 1 - theorie OO concepten (periode 1 en 2)
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Een samenvatting van de theorie van OO concepten, een subvak van programmeren 1 uit toegepaste informatica aan kdg.
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PROGRAMMEREN1-P1
KDG | 2021
,Inhoudsopgave
H1: Inleiding .......................................................................................................................5
1.1 Omzetten 3GL naar binair ................................................................................................ 6
1.2 Toepassingen.................................................................................................................... 8
H2: Java Development Kit ...................................................................................................8
2.1 JRE .................................................................................................................................... 8
2.2 JDK .................................................................................................................................... 9
H3: Het eerste Java programma..........................................................................................9
3.1 Compileren van de broncode ......................................................................................... 10
3.2 Uitvoeren van de bytecode ............................................................................................ 10
H4: Programmeeralgoritmen ............................................................................................ 11
4.1 Algoritme omzetten naar Java ....................................................................................... 12
4.2 Volledige broncode ........................................................................................................ 13
H5: De Java Programmeertaal .......................................................................................... 13
5.1 Variabelen en literals ..................................................................................................... 13
5.1.1 Variabele .................................................................................................................. 13
5.1.1.2 Naam variabele ..................................................................................................... 14
5.1.1.3 Opmerkingen ........................................................................................................ 15
5.1.1.4 Code convention.................................................................................................... 15
5.1.2 Literals ........................................................................................................................ 15
5.1.2.1 Een final variabele ................................................................................................. 17
5.1.2.2 Conversie tussen de types ..................................................................................... 17
5.2 Operatoren ..................................................................................................................... 18
5.2.1 Rekenkundige operatoren ........................................................................................ 18
5.2.2 Relationele operatoren ............................................................................................ 19
5.2.3 Logische operatoren................................................................................................. 19
5.2.4 Toekenningsoperatoren ........................................................................................... 20
5.2.5 Conditionele operatoren .......................................................................................... 21
5.2.6 Overige operatoren (voor volledigheid) ................................................................... 21
5.2.7 Prioriteitsregels ........................................................................................................ 21
5.3 Uitdrukkingen, statement en codeblok .......................................................................... 22
5.3.1 Uitdrukkingen........................................................................................................... 22
1
, 5.3.2 Statement ................................................................................................................ 22
5.3.3 Codeblokken ............................................................................................................. 23
5.3.4 Scope ........................................................................................................................ 24
5.4 Constructies ................................................................................................................ 25
5.4.1 If statement ................................................................................................................. 25
Syntax ............................................................................................................................... 26
Schematische voorstelling................................................................................................. 26
5.4.2 If … else statement ...................................................................................................... 26
Syntax ............................................................................................................................... 26
Schematische voorstelling................................................................................................. 27
Genestelde if ..................................................................................................................... 27
5.4.3 Switch statement ........................................................................................................ 28
Syntax ............................................................................................................................... 28
5.4.4 While lus ...................................................................................................................... 29
Syntax ............................................................................................................................... 29
Schematische voorstelling................................................................................................. 29
Opmerkingen .................................................................................................................... 30
5.4.5 Do while lus ................................................................................................................. 30
Syntax ............................................................................................................................... 31
Schematische voorstelling................................................................................................. 31
5.4.6 For lus .......................................................................................................................... 31
Syntax ............................................................................................................................... 32
Schematische voorstelling................................................................................................. 32
Opmerkingen .................................................................................................................... 32
5.4.7 Soorten codeblokken .................................................................................................. 33
H6 Object georiënteerd programmeren ............................................................................ 33
6.1 Inleiding .......................................................................................................................... 33
6.1.1 Objecten ................................................................................................................... 34
6.1.2 Boodschappen .......................................................................................................... 34
6.1.3 Klassen ..................................................................................................................... 35
6.2 Werken met objecten .................................................................................................... 36
6.2.1 Objecten maken ....................................................................................................... 36
6.2.2 Random .................................................................................................................... 37
6.2.3 Referentie ................................................................................................................. 39
6.2.4 Pakket ...................................................................................................................... 40
2
, 6.2.5 Garbage collection ................................................................................................... 42
6.3 Eenvoudige objecten ...................................................................................................... 42
6.3.1 De klasse string ........................................................................................................ 42
6.3.2 String creatie ............................................................................................................ 43
6.3.3 String methoden ...................................................................................................... 44
6.3.4 Strings samenvoegen ............................................................................................... 45
6.3.5 De klasse Stringbuilder ............................................................................................. 46
6.4 Formatteren ................................................................................................................... 47
H7: Klassen ....................................................................................................................... 49
7.1 Inleiding .......................................................................................................................... 49
7.2 Naamgeving.................................................................................................................... 49
7.3 Nieuwe klasse ................................................................................................................. 49
7.3.1 Wat schrijven we zoal in de body van een klasse? ................................................... 50
H8 Arrays .......................................................................................................................... 79
8.1 inleiding .......................................................................................................................... 79
8.2 Creatie van een array ..................................................................................................... 80
8.2.1 Arrays met objecten erin .......................................................................................... 81
8.2.2 Niet opgevulde arrays .............................................................................................. 81
8.2.3 Length ...................................................................................................................... 81
8.3 Arrays uitlezen................................................................................................................ 82
8.4 For each lus .................................................................................................................... 82
8.5 Toepassingen arrays ....................................................................................................... 84
8.6 Geheugenstructuur arrays en primitieve types ............................................................. 85
8.7 Arrays in arrays............................................................................................................... 85
8.7.1 Tweedimensionale arrays ........................................................................................ 85
8.7.2 Jagged arrays ........................................................................................................... 87
8.7.3 Driedimensionale arrays .......................................................................................... 87
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