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Objektorienteeritud programmeerimine (LTAT.03.003)

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Olgu olemas abstraktne klass Kujund:

public abstract class Kujund {
    public abstract double pindala();
}

Millised järgmistest variantidest on korrektsed?

public abstract class Ring extends Kujund {
    private int raadius;
}

public abstract class Ring implements Kujund {
    private int raadius;
    public double pindala();
}

public class Ring extends Kujund {
    private int raadius;
    public double pindala();
}

public class Ring extends Kujund {
    private int raadius;
    public double pindala(){
        return Math.PI * raadius * raadius;
    }
}

public class Ring implements Kujund {
    private int raadius;
    public double pindala(){
        return Math.PI * raadius * raadius;
    }
}

public class Ring implements Kujund {
    private int raadius;
}

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On antud programm

public _____________ Luuviljaline {
   String vitamiinid();
   double kaal();
}

Millised alltoodud variantidest sobivad lünka, et programm oleks korrektne?

class

abstract class

❌

interface

✅

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Vali iga kirjeldatud olukorra jaoks, millist voogu on kõige otstarbekam ja efektiivsem kasutada.

Faili on vaja kirjutada binaarandmeid

On vaja lugeda tekstifailist

On vaja lugeda failist, mis on moodustatud klassi java.io.DataOutputStream abil

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Milline koodijupp vastab antud pildile?

Image failed to load

HBox juur = new HBox();
Circle ring = new Circle(30, Color.RED);
Rectangle ristkülik = new Rectangle(50,50);
juur.getChildren().addAll(ring, ristkülik);
Scene stseen = new Scene(juur, 200, 200);
peaLava.setScene(stseen);
peaLava.show();

Group juur = new Group();
Circle ring = new Circle(70, -70, 30, Color.RED);
Rectangle ristkülik = new Rectangle(40, -100, 50, 50);
juur.getChildren().addAll(ring,ristkülik);
Scene stseen = new Scene(juur, 200, 200);
peaLava.setScene(stseen);
peaLava.show();

VBox juur = new VBox();
Circle ring = new Circle(30, Color.RED);
Rectangle ristkülik = new Rectangle(50, 50);
juur.getChildren().addAll(ring, ristkülik);
Scene stseen = new Scene(juur, 200, 200);
peaLava.setScene(stseen);
peaLava.show();

Group juur = new Group();
Circle ring = new Circle(30, Color.RED);
Rectangle ristkülik = new Rectangle(50, 50);
juur.getChildren().addAll(ring, ristkülik);
Scene stseen = new Scene(juur, 200, 200);
peaLava.setScene(stseen);
peaLava.show();

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Millised read väljastatakse ekraanile?

try {
   System.out.println("Üks");
   System.out.println("Kaks");
   throw new NullPointerException("Kolm");
} catch (ArithmeticException e) {
   System.out.println("Neli");
} catch (NullPointerException e) {
   System.out.println("Viis");
} finally {
   System.out.println("Kuus");
}
System.out.println("Seitse");

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Olgu olemas liides Pindalaline:

public interface Pindalaline {
    double pindala();
}

Millised järgmistest variantidest on korrektsed?

public abstract class Ring extends Pindalaline {
    private int raadius;
}

public class Ring extends Pindalaline {
    private int raadius;
    public double pindala(){
        return Math.PI * raadius * raadius;
    }
}

public abstract class Ring implements Pindalaline {
    private int raadius;
}

public class Ring implements Pindalaline {
    private int raadius;
    public double pindala(){
        return Math.PI * raadius * raadius;
    }
}

public interface Ring implements Pindalaline {
    int raadius;
    double pindala();
}

public class Ring implements Pindalaline {
    private int raadius;
    public double pindala();
}

public class Ring implements Pindalaline {
    private int raadius;
}

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On antud programm

public class Arv {
   private int i;
   public Arv(int i) {
       this.i = i;
   }
   public void setI(  i) {
       this.i = i;
   }
   @Override
   public String toString() {
       return "Arv = " + i;
   }
}

Täida lünk. Lünk võib sisaldada ühte sõna.

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Mis värvi on ring?

Circle ring = new Circle(50, Color.RED);
ring.setOnMouseClicked(
       event -> {
           if (ring.getFill() == Color.RED)
               ring.setFill(Color.BLUE);
           else
               ring.setFill(Color.YELLOW);
       }
);

Kui klikkida sellele 2 korda

Kui klikkida sellele 3 korda

Akna näitamisel

Kui klikkida sellele 1 kord

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Mitu rida väljastatakse ekraanile?

Failis Minu fail.txt on järgmised read:

Javas programmeerimine seisneb klasside koostamises.

Väga olulisel kohal on koostatud klasside isendite (objektide) loomine.

try (Scanner sc = new Scanner("Minu fail.txt")) {
   while (sc.hasNextLine()) {
       String rida = sc.nextLine();
       String[] tükid = rida.split(" ");
       for (String t : tükid)
           System.out.println(t);
   }
}

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On antud programm

public abstract class Puuvili {
   String nimetus;
   public Puuvili(String nimetus) {
       this.nimetus = nimetus;
   }
   abstract String vitamiinid();
   @Override
   public String toString() {
       return  nimetus + " sisaldab " + vitamiinid() + " vitamiine";
   }
}
public class Virsik _____________ Puuvili {
   public Virsik(String nimetus) {
       super(nimetus);
   }
   public String vitamiinid() {
       return "A ja C";
   }
}

Millised alltoodud variantidest sobivad lünka, et programm oleks korrektne?

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