import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.util.*;

public class Oefening7punt7 extends JFrame{

    public static void main(String[] args) {
        Oefening7punt7 frame = new Oefening7punt7();
        frame.setSize(600,600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new Paneel());
        frame.setTitle("Oefening 7.7");
        frame.setVisible(true);
        frame.setLocationRelativeTo(null);

    }
}
    class Paneel extends JPanel{
        private JButton knop;
        private JTextArea veld;
        private Studenten studenten;
        private Student marc, rik;
        public Paneel(){
            knop = new JButton("Examenresultaten");
            veld = new JTextArea(30,50);

            knop.addActionListener(new Handler());

            add(veld);
            add(knop);

            //punten ingeven
            marc = new Student("Marc", new Datum(26,11,2015));
            rik = new Student("Rik", new Datum(26,11,2015));

            marc.voegToe(new Examen("Wiskunde", 18, new Datum(26,11,2015)));
            marc.voegToe(new Examen("Java", 20, new Datum(24,11,2015)));

            rik.voegToe(new Examen("Wiskunde", 18, new Datum(26,11,2015)));
            rik.voegToe(new Examen("Java", 16, new Datum(24,11,2015)));

            studenten = new Studenten();
            studenten.voegToe(marc);
            studenten.voegToe(rik);
        }
        class Handler implements ActionListener{
            public void actionPerformed (ActionEvent e){
                veld.setText(studenten.toString());
            }
        }
    }
class Datum{
    private int dag, maand, jaar;

    public Datum(){
        dag = 1;
        maand = 1;
        jaar = 2015;
    }
    public Datum(int dag, int maand, int jaar){
        this.dag = dag;
        this.maand = maand;
        this.jaar = jaar;
    }
    public String toString(){
        return dag + "-" + maand + "-" + jaar;
    }
}
class Examen{
    private int resultaat;
    private String vak;
    private Datum datum;

    public Examen(String vak, int resultaat, Datum datum){
        this.vak = vak;
        this.resultaat = resultaat;
        this.datum = datum;
    }
    public String toString(){
        return "Vak: " + vak + ", Cijfer: " + resultaat + ", Datum: " + datum;
    }
}
class Student{
    private ArrayList<Examen> resultaten;
    private String naam;
    private Datum gebdatum;

    public Student(String naam, Datum gebdatum){
        resultaten = new ArrayList<Examen>();
        this.naam = naam;
        this.gebdatum = gebdatum;
    }
    public void voegToe(Examen examen){
        resultaten.add(examen);
    }
    public String toString(){
        StringBuffer buffer = new StringBuffer();
        for(Examen examen : resultaten){
            buffer.append(examen);
            buffer.append("\n");
        }
        return naam + " Geboren op: " + gebdatum.toString() + "\n" + buffer;
    }
}
class Studenten{
    private ArrayList<Student> studenten;

    public Studenten(){
        studenten = new ArrayList<Student>();
    }
    public void voegToe(Student student){
        studenten.add(student);
    }
    public String toString(){
        StringBuffer buffer = new StringBuffer();
        for(Student student : studenten){
            buffer.append(student);
            buffer.append("\n\n");
        }
        return "" + buffer;
    }
}