Created
January 12, 2012 07:41
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Taulukon läpikäyntejä
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public static void main(String[] args) { | |
int[] luvut = {1, 2, 3, 4, 5, 6}; | |
int summa = (Integer) (new Summa(luvut).tulos() ); | |
System.out.println(summa); | |
double keskiarvo = (Double)new Keskiarvo(luvut).tulos() ; | |
System.out.println(keskiarvo); | |
System.out.println( new Merkkijono(luvut).tulos() ); | |
} |
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abstract class Lapikayja { | |
int[] taulukko; | |
public Lapikayja(int[] taulukko) { | |
this.taulukko = taulukko; | |
} | |
void lapikay(int[] taulukko, Lapikayja lapikayja) { | |
for (int luku : taulukko) { | |
lapikayja.operoi(luku); | |
} | |
} | |
Object tulos(){ | |
lapikay(taulukko, this); | |
return muodostaTulos(); | |
} | |
abstract void operoi(int luku); | |
abstract Object muodostaTulos(); | |
} |
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class Summa extends Lapikayja { | |
public Summa(int[] taulukko) { | |
super(taulukko); | |
} | |
private int summa = 0; | |
@Override | |
public void operoi(int luku) { | |
summa += luku; | |
} | |
@Override | |
public Object muodostaTulos() { | |
return summa; | |
} | |
} |
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class Keskiarvo extends Lapikayja { | |
public Keskiarvo(int[] taulukko) { | |
super(taulukko); | |
} | |
private double summa = 0; | |
private int n = 0; | |
@Override | |
public void operoi(int luku) { | |
summa += luku; | |
n++; | |
} | |
@Override | |
public Object muodostaTulos() { | |
return (summa/n); | |
} | |
} |
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class Merkkijono extends Lapikayja { | |
public Merkkijono(int[] taulukko) { | |
super(taulukko); | |
} | |
private String mj = ""; | |
@Override | |
void operoi(int luku) { | |
mj += luku + ", "; | |
} | |
@Override | |
Object muodostaTulos() { | |
return mj.substring(0, mj.length()-2); | |
} | |
} |
erittäin hyvä huomio! pitää fiksata myöhemmin
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Voishan tossa olla myös tyyppiparametrit.