java.io.NotSerializableException: javax.swing.plaf.metal.MetalFileChooserUI
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)
	at javax.swing.event.EventListenerList.writeObject(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
	at javax.swing.JComponent.writeObject(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
	at java.awt.Window.writeObject(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)
	at java.awt.Window.writeObject(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)
	at java.util.ArrayList.writeObject(Unknown Source)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
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	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)
	at GraphEditor.actionPerformed(GraphEditor.java:191)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.AbstractButton.doClick(Unknown Source)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
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	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
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	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
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	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
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	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.io.EOFException;
import java.io.File;
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 javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class GraphEditor extends JFrame implements MouseListener, MouseMotionListener, ActionListener {
	
	//Globale Variablen
	JTextField txt = new JTextField(10);
	JPanel panel1 = new JPanel();
	
	//Globale Variablen
	Kreis gezogenerKreis = null; //Kreis-Objekt zum Zwischenspeichern des bewegten Kreises
	
	//Kreisdurschnitt
	final int dX = 16, dY = 16;
	
	//Erstkonfiguration und Koordinatenkorrekturen
	int korrekturX = 0, korrekturY = 0;
	int korrekturX1 = 0, korrekturY1 = 0, korrekturX2 = 0, korrekturY2 = 0, configclickcounter = 1;
	boolean configured = false;
	
	//ArrayList zum Aufnehmen der Kreis-Objekte
	ArrayList<Kreis> kreise = new ArrayList<Kreis>(); 

	//Konstruktor der Klasse GraphEditor
	public GraphEditor(){
		
		//Aufruf des Konstruktors der Oberklasse
		super("GraphEditor");
		
		//Schließen des Fensters 
		setDefaultCloseOperation(DISPOSE_ON_CLOSE);
		
		//Menüleiste
		JMenuBar mbar = new JMenuBar();
		this.setJMenuBar(mbar);
		
		//Menü
		JMenu mGraph = new JMenu("Graph");
		JMenu mVertex = new JMenu("Vertex");
		
		//Menüelemente
		JMenuItem mGraphOpen = new JMenuItem("open");
		JMenuItem mGraphNew = new JMenuItem("new");
		JMenuItem mGraphSave = new JMenuItem("save");
		JMenuItem mVertexInsert	= new JMenuItem("insert");
		JMenuItem mVertexMove = new JMenuItem("move");
		JMenuItem mVertexDelete = new JMenuItem("delete");
		JMenuItem mVertexNone = new JMenuItem("none");
		
		//Hinzufügen der Elemente zur Menüleiste
		mGraph.add(mGraphNew);
		mGraph.add(mGraphOpen);
		mGraph.add(mGraphSave);
		mVertex.add(mVertexInsert);
		mVertex.add(mVertexMove);
		mVertex.add(mVertexDelete);
		mVertex.add(mVertexNone);		
		mbar.add(mGraph);
		mbar.add(mVertex);
		
		//Haupt-Panel
		this.setLayout(new BorderLayout());
		panel1.setBackground(Color.white);
		this.add(panel1, BorderLayout.CENTER);
		panel1.addMouseListener(this);
		panel1.addMouseMotionListener(this);
		
		//unteres Panel für Label und Textfeld
		JPanel panel2 = new JPanel();
		this.add(panel2, BorderLayout.SOUTH);
		
		//Label
		JLabel label = new JLabel("Selected Action", JLabel.RIGHT);
		panel2.setLayout(new GridLayout(1,2,5,0));
		panel2.add(label);
		
		//Panel für Textfeld
		JPanel panel3 = new JPanel();
		panel3.setLayout(new FlowLayout(3));
		panel2.add(panel3);
		
		//Textfeld
		txt.setText("none");
		txt.setDisabledTextColor(Color.black);
		txt.setEnabled(false);
		panel3.add(txt);
		
		//ActionListener
		mVertex.addActionListener(this); // vertex:
		mVertexInsert.addActionListener(this);
		mVertexDelete.addActionListener(this);
		mVertexMove.addActionListener(this);
		mVertexNone.addActionListener(this);
		mGraph.addActionListener(this); // graph:
		mGraphNew.addActionListener(this);
		mGraphOpen.addActionListener(this);
		mGraphSave.addActionListener(this);
		
		//ActionCommands
		mVertex.setActionCommand("vertex"); // vertex:
		mVertexInsert.setActionCommand("insert");
		mVertexDelete.setActionCommand("delete");
		mVertexMove.setActionCommand("move");
		mVertexNone.setActionCommand("none");
		mGraph.setActionCommand("graph"); // graph:
		mGraphNew.setActionCommand("new");
		mGraphOpen.setActionCommand("open");
		mGraphSave.setActionCommand("save");
	}
	
	//Überschriebene Paint-Methode zum Zeichnen der Kreise
	public void paint(Graphics g) {
		super.paint(g);
		for (Kreis k: kreise) {
			g.setColor(k.c);
			g.fillOval(k.x - k.dx/2 + korrekturX, k.y - k.dy/2 + korrekturY, k.dx, k.dy);
		}
	}
	
	//ActionEvent
	public void actionPerformed(ActionEvent ae){
		//Zwischenspeichern
		String action = ae.getActionCommand();
		
		//werden unabhängig von der Erstkonfiguration immer ausgeführt
		if(action == "delete"){
			txt.setText("Vertex: delete");
		}
		if(action == "move"){
			txt.setText("Vertex: move");
		}
		if(action == "none"){
			txt.setText("none");
		}
		//wenn insert zum ersten Mal ausgewählt wird: Infofenster anzeigen
		if (configured == false && action == "insert") {
			int wahl = JOptionPane.showConfirmDialog(this, "" +
					"Bei der ersten Verwendung des Programms muss eine Konfiguration erfolgen. \n" +
					"Bitte klicken Sie an eine Stelle mittig im Zeichenbereich und danach\n " +
					"exakt in den weißen Punkt in der Mitte des gezeichneten Kreises!", 
					"Konfiguration nötig!", JOptionPane.OK_CANCEL_OPTION);
			if (wahl == JOptionPane.OK_OPTION) {
				txt.setText("Vertex: insert");
			}
		}
		//wenn Erstkonfiguration schon abgeschlossen ist
		else if (configured == true) {
			if(action == "insert"){
				txt.setText("Vertex: insert");	
			}
		}
		
		//Löschen der Kreise aus der Liste 
		if(action == "new") {
			kreise.clear();
			repaint();
		}
		
		//Speichern der gezeichneten Kreise
		if(action == "save") {
			JFileChooser fc = new JFileChooser();
			int fcreturn = fc.showDialog(this, "Speichern");
			if (fcreturn == JFileChooser.APPROVE_OPTION) {
	            File savefile = fc.getSelectedFile();
				try {
					FileOutputStream fos = new FileOutputStream(savefile);
					ObjectOutputStream oos = new ObjectOutputStream(fos);
					for (Kreis k : kreise) {
						oos.writeObject(k);
					}
					oos.close();
					fos.close();
				} catch (FileNotFoundException e) {
					e.printStackTrace();
				}
				catch (IOException e) {
					e.printStackTrace();
				}	
			}
		}
		
		//Öffnen einer bereits gespeicherten Datei mit Punkten
		if(action == "open") {
			kreise.clear();
			JFileChooser fc = new JFileChooser();
			int fcreturn = fc.showDialog(this, "Öffnen");
			if (fcreturn == JFileChooser.APPROVE_OPTION) {
	            File openfile = fc.getSelectedFile();
	            fc = null;
	            FileInputStream fis;
	            ObjectInputStream ois;
				try {
					fis = new FileInputStream(openfile);
					ois = new ObjectInputStream(fis);
					try {
						while (true) {
						kreise.add((Kreis) ois.readObject());
						repaint();
						}
					}
					catch (EOFException e) {
						System.out.println("Dateiende erreicht");
						ois.close();
						fis.close();
					}
				}
				catch (IOException e) {
					e.printStackTrace();
				} 
				catch (ClassNotFoundException e) {
					e.printStackTrace();
				}	
	        }
		}
		repaint();
	}
	
	//MouseEvents
	public void mouseClicked(MouseEvent me){
		repaint();
		int cursorX = me.getX();
		int cursorY = me.getY();
		//Erstkonfiguration der Koordinatenkorrektur starten, wenn noch nicht erfolgt
		if (configured == false) {
			//erster Klick der Erstkonfiguration, Textfeld mit "Vertex: insert" nur, wenn der Benutzer im Dialog "OK" geklickt hat
			if (configclickcounter == 1 && txt.getText().equals("Vertex: insert")) {
				//erstes Koordinatenpaar lesen
				korrekturX1 = me.getX();
				korrekturY1 = me.getY();
				configclickcounter++;
				/* Kreis mit den unkonfigurierten Standardkoordinaten zeichnen; 				
				 * dieser wird links oberhalb des Klickpunktes erscheinen, je nach Betriebssystem(/-version)
				 * und Windows-Design unterschiedlich!
				 * Ein kleiner weißer Kreis symbolisiert die Mitte, die angeklickt werden muss. */		 
				kreise.add(new Kreis(cursorX, cursorY, dX, dY));
				kreise.add(new Kreis(cursorX, cursorY, 2, 2, Color.WHITE));
			//zweiter Klick der Erstkonfiguration
			} else if (configclickcounter == 2 && txt.getText().equals("Vertex: insert")) {
				//Konfigurationskreise löschen
				kreise.clear();
				repaint();
				//zweites Koordinatenpaar lesen
				korrekturX2 = me.getX();
				korrekturY2 = me.getY();
				//Korrekturen errechnen
				korrekturX = korrekturX1 - korrekturX2;
				korrekturY = korrekturY1 - korrekturY2;
				//Konfiguration beenden, Infodialog anzeigen
				configured = true;
				JOptionPane.showConfirmDialog(this, "" +
						"Die Konfiguration ist abgeschlossen. \n" +
						"Koordinatenkorrektur für X: " + korrekturX + " | Y: " + korrekturY, 
						"Konfiguration abgschlossen!", JOptionPane.OK_CANCEL_OPTION);
			}
		}		
		//Erstkonfiguration beendet
		else if (configured == true){
			if(txt.getText().equals("Vertex: insert")){
				kreise.add(new Kreis(cursorX, cursorY, dX, dY));
			}
		}
		if(txt.getText().equals("Vertex: delete")){
			for(Kreis k : kreise){
				if(cursorX <= (k.x + dX/2.0) && cursorX >= (k.x - dX/2.0) && cursorY <= (k.y + dY/2.0) && cursorY >= (k.y - dY/2.0)){
					kreise.remove(k);
					break;
				} 
			}
		}
	}	
	
	public void mousePressed(MouseEvent me){
		if(txt.getText().equals("Vertex: move")){
			int cursorX = me.getX();
			int cursorY = me.getY();
			for(Kreis k : kreise){
				if(cursorX <= (k.x + dX/2.0) && cursorX >= (k.x - dX/2.0) && cursorY <= (k.y + dY/2.0) && cursorY >= (k.y - dY/2.0)){
					gezogenerKreis = k;					
				} 
			}
		}
	}
	public void mouseEntered(MouseEvent arg0){}
	public void mouseExited(MouseEvent arg0){}
	public void mouseReleased(MouseEvent arg0){
		gezogenerKreis = null;
	}

	//MouseMotionEvents
	public void mouseDragged(MouseEvent me) {
		if(txt.getText().equals("Vertex: move")){
			if(gezogenerKreis != null) {	
				gezogenerKreis.x = me.getX();
				gezogenerKreis.y = me.getY();	
				repaint();
			}
		}
	}
	public void mouseMoved(MouseEvent e){}
	
	//Main-Methode		
	public static void main(String[] args){
		
		//GraphEditor-Objekt
		GraphEditor ui = new GraphEditor();
		
		//Setzen der Größe und Sichtbarkeit des GraphEditor-Objekts
		ui.setSize(550, 350);
		ui.setVisible(true);
		
	}

}

import java.awt.Color;
import java.io.Serializable;

public class Kreis implements Serializable {
	//Innere Kreis-Klasse
	public static final long serialVersionUID = 3L;
	public int x, y, dx, dy, id;
	public Color c = Color.BLACK;	
	int counter = 0;
	// 2 verschieden überladene Konstruktoren ermöglichen die freie Farbwahl für jeden einzelnen Kreis
	public Kreis(int x, int y, int dx, int dy, Color c) {
		this.x = x;
		this.y = y;
		this.dx = dx;
		this.dy = dy;
		this.c = c;
		this.id = ++counter;
	}
	public Kreis(int x, int y, int dx, int dy) {
		this.x = x;
		this.y = y;
		this.dx = dx;
		this.dy = dy;
	}
	@Override
	public String toString() {
		return "x:"+ x + " y:" + y + " dx:" + dx + " dy:" + dy + " color:" + c.toString()+ "\n";

	}
}