graphic_chat/src/mvcgrafik/model/GrafikModel.java

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package mvcgrafik.model;

import java.awt.Point;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 *
 * @author le
 */
public class GrafikModel
{
  private ArrayList<Figure> figures;
  
  public GrafikModel()
  {
    figures = new ArrayList<>();
  }
  
  public Figure addFigure()
  {
    figures.add(new Figure());
    return figures.get(figures.size() - 1);
  }

  public List<Figure> getFigures()
  {
    return Collections.unmodifiableList(figures);
  }
  
  public void speichereDatei(String dateiname) throws FileNotFoundException, IOException
  {
    FileOutputStream fos = new FileOutputStream(dateiname);
    BufferedOutputStream buffout = new BufferedOutputStream(fos);
    ObjectOutputStream oos = new ObjectOutputStream(buffout);
    oos.writeObject(figures);
    oos.flush();
    oos.close();

  }

  public void ladeDatei(String dateiname) throws FileNotFoundException, IOException, ClassNotFoundException
  {
    FileInputStream fis = new FileInputStream(dateiname);
    BufferedInputStream buffin = new BufferedInputStream(fis);
    ObjectInputStream ois = new ObjectInputStream(buffin);
    Object obj = ois.readObject();
//     if (obj instanceof ArrayList)
//     {
//       punkte = (ArrayList<Point>) obj;
//     }
//     else
//     {
//       Fehler ....
//     }
    figures =  (ArrayList<Figure>) ois.readObject();
    ois.close();
  }
}