Lottotrekking

GlazenBol.java

package it.sijmen;

import java.util.ArrayList;
import java.util.Random;

/**
 * Created by Sijmen on 15-2-2016.
 */
public class GlazenBol {

    private int capaciteit;

    private ArrayList<Lottobal> ballen;

    private Random random;

    public GlazenBol(int capaciteit) {
        this.capaciteit = capaciteit;
        this.ballen = new ArrayList<>(this.capaciteit);
        this.random = new Random();
    }

    public void verzamelAlleBallen(){
        for(int i = 1; i <= capaciteit; i++)
            this.ballen.add(new Lottobal(i));
    }

    public Lottobal schepBal(){
        int index = random.nextInt(ballen.size());
        Lottobal bal = ballen.get(index);
        ballen.remove(index);
        return bal;
    }
}

Lottobal.java

package it.sijmen;

/**
 * Created by Sijmen on 15-2-2016.
 */
public class Lottobal implements Comparable<Lottobal>{

    private int balnummer;

    public Lottobal(int balnummer) {
        this.balnummer = balnummer;
    }

    public int getBalnummer() {
        return balnummer;
    }

    @Override
    public int compareTo(Lottobal andereBal) {
        return Integer.compare(this.balnummer, andereBal.getBalnummer());
    }

    @Override
    public String toString() {
        return balnummer + "";
    }
}

Lottomachine.java

package it.sijmen;

/**
 * Created by Sijmen on 15-2-2016.
 */
public class Lottomachine {

    private Scorebord bord;

    private GlazenBol bol;
    private boolean uitslag;

    public Lottomachine() {
        this.bord = new Scorebord();
        this.bol = new GlazenBol(99);
    }

    public void voerTrekkingUit(){
        bol.verzamelAlleBallen();
        bord.maakLeeg();
        for(int i = 0; i < 6; i++)
            bord.plaatsBal(bol.schepBal());
        bord.plaatsBonusbal(bol.schepBal());
        bord.sorteerBallen();
    }

    public String getUitslag() {
        return bord.toString();
    }
}

Main.java

package it.sijmen;

public class Main {

    public static void main(String[] args) {
        Lottomachine lottomachine = new Lottomachine();
        lottomachine.voerTrekkingUit();
        System.out.println(lottomachine.getUitslag());
    }
}

Scorebord.java

package it.sijmen;

import java.util.ArrayList;
import java.util.Collections;

/**
 * Created by Sijmen on 15-2-2016.
 */
public class Scorebord {

    private Lottobal bonusBal;

    private ArrayList<Lottobal> ballen;

    public Scorebord() {
        this.bonusBal = null;
        this.ballen = new ArrayList<>();
    }

    public void plaatsBal(Lottobal bal){
        this.ballen.add(bal);
    }

    public void plaatsBonusbal(Lottobal bal){
        if(this.bonusBal != null)
            throw new IllegalStateException("Er is al een bonusbal geplaats");
        this.bonusBal = bal;
    }

    public void maakLeeg(){
        this.bonusBal = null;
        this.ballen.clear();
    }

    public void sorteerBallen(){
        Collections.sort(ballen);
    }

    @Override
    public String toString() {
        return "Scorebord{" +
                "ballen=" +  ballen +
                ", bonusBal=" + bonusBal +
                '}';
    }
}