diff --git a/Edge.java b/Edge.java
index 1072964..24c08c5 100644
--- a/Edge.java
+++ b/Edge.java
@@ -4,23 +4,38 @@ public class Edge implements Comparable
     private Node ende; 
     private int wert; 
     private boolean gerichtet; 
-    
+
     public Edge(Node a, Node e, int w, boolean r){
         this.anfang = a; 
         this.ende = e;
         this.wert = w ;
         this.gerichtet = r;
     }
-    
+
     public Node getAnfang(){return this.anfang;}
+
     public Node getEnde(){return this.ende;}
+
     public int getWert(){return this.wert;}
+
     public boolean istGerichtet(){return this.gerichtet;}
-    
+
     public int compareTo(Object o) {
         Edge other = (Edge)o;
         if(this.wert < other.wert)return -1;
         if(this.wert > other.wert)return 1;
         return 0;
-}
+    }
+    
+    public String toString(){
+        /*String ergebnis = "E ";
+        ergebnis += anfang.getNumber() + " ";
+        ergebnis += ende.getNumber() + " ";
+        if (this.gerichtet) ergebnis += "1 ";
+        else ergebnis += "0 "; 
+        ergebnis += this.wert; 
+        return ergebnis; */
+        
+        return "E " + anfang.getNumber() + " " + ende.getNumber() + " " + wert + " " + (gerichtet ? 1 : 0);
+    }
 }
\ No newline at end of file
diff --git a/Graph.java b/Graph.java
index c2af13d..2fe7587 100644
--- a/Graph.java
+++ b/Graph.java
@@ -1,6 +1,8 @@
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.Collections;
+import java.io.*;
+
 public class Graph
 {
     private ArrayList<Node> nodes;
@@ -36,6 +38,7 @@ public class Graph
     public ArrayList<Edge> getEdges(){
         return this.edges;
     }
+    
     public void addEdge(int a, int e, int w, boolean g){
         Node an = null;
         Node en = null;
@@ -70,6 +73,7 @@ public class Graph
         }
         return null;
     }
+    
     public ArrayList<Node> breitensuche(int start){
         ArrayList<Node> ergebnis = new ArrayList<Node>();
         LinkedList<Node> q = new LinkedList<Node>();
@@ -90,7 +94,26 @@ public class Graph
 
         return ergebnis;
     }
+    
+    public void tiefensucheGraphisch(){
+        ArrayList<Node> ergebnis = new ArrayList<Node>();
+        LinkedList<Node> q = new LinkedList<Node>();
+        //q.add(this.getNode(start));
 
+        while(!q.isEmpty()){
+            Node aktuell = q.removeLast();
+            if (ergebnis.contains(aktuell)){
+                continue;
+            }
+
+            ArrayList<Node> erreichbar = aktuell.getTargets();
+            Collections.sort(erreichbar, Collections.reverseOrder());
+            q.addAll(erreichbar);
+
+            ergebnis.add(aktuell);
+        }
+    }
+    
     public ArrayList<Node> tiefensuche(int start){
         ArrayList<Node> ergebnis = new ArrayList<Node>();
         LinkedList<Node> q = new LinkedList<Node>();
@@ -212,4 +235,39 @@ public class Graph
         }
         return sb;
     }
+    
+    public void save (String filename){
+        try{
+            FileWriter f = new FileWriter(filename);
+            for(Node n : this.nodes){
+                f.write(n.toString() + "\n");
+            }
+            for(Edge e : this.edges){
+                f.write(e.toString() + "\n");
+            }
+            f.close();
+        }catch(IOException e){}
+        
+    }
+    
+    public int load (String filename){
+        int max = 0;
+        try{
+            BufferedReader f = new BufferedReader(new FileReader(filename));
+            String line = f.readLine();
+            while(line != null){
+                String[] data = line.split(" ");
+                if(data[0].equals("N")) {
+                    this.addNode(Integer.parseInt(data[1]),Integer.parseInt(data[2]),Integer.parseInt(data[3]));
+                    if (Integer.parseInt(data[1]) > max) max = Integer.parseInt(data[1]);
+                }
+                if(data[0].equals("E")) {
+                    this.addEdge(Integer.parseInt(data[1]),Integer.parseInt(data[2]),Integer.parseInt(data[3]),data[4].equals("1"));
+                }
+                line = f.readLine();
+            }
+            f.close();
+        } catch(IOException e){}
+        return max;
+    }
 }
diff --git a/MyPanel.java b/MyPanel.java
index bdb40fd..8b08bde 100644
--- a/MyPanel.java
+++ b/MyPanel.java
@@ -13,6 +13,7 @@ public class MyPanel extends JPanel
     private Node nmove;
     private int x; 
     private int y; 
+    
     public MyPanel(){
         g = new Graph();
         nr = 1;
@@ -22,7 +23,7 @@ public class MyPanel extends JPanel
         start = g.getNode(x, y);
         if ( start == null){
             g.addNode(nr, x, y);
-            nr++;
+            nr++; 
         } 
     }
     
@@ -40,6 +41,7 @@ public class MyPanel extends JPanel
         start = null;
         nmove=null;
     }
+    
     public void move (int x, int y){
         this. x = x;
         this. y = y;
@@ -52,6 +54,22 @@ public class MyPanel extends JPanel
     public void right(int x, int y){
         this.nmove = g.getNode(x,y);
     }
+    
+    public void save(){
+        this.g.save("test.txt");
+    }
+    
+    public void load(){
+        this. nr = this.g.load("test.txt") +1;
+    }
+    
+    public void clear(){
+        g = new Graph();
+    }
+    
+    public void tiefensuche(){
+        g.tiefensuche(1);
+    }
     @Override
     protected void paintComponent(Graphics g){
         super.paintComponent(g);
diff --git a/Node.java b/Node.java
index b84aee5..772d5d6 100644
--- a/Node.java
+++ b/Node.java
@@ -63,4 +63,8 @@ public class Node implements Comparable
         if(this.number > other.number)return 1;
         return 0;
     }
+    
+    public String toString(){
+        return "N " + this.number + " " + this.x + " " + this.y;
+    }
 }
diff --git a/Window.java b/Window.java
index 76eeeab..f92bf1d 100644
--- a/Window.java
+++ b/Window.java
@@ -8,6 +8,9 @@ public class Window implements ActionListener
     private MyPanel panel;
     private JButton button;
     private JButton button2;
+    private JButton button3;
+    private JButton button4;
+    
     public  Window(){
         fenster = new JFrame("Mein erstes Fenster");
         fenster.setSize(400,400);
@@ -22,14 +25,23 @@ public class Window implements ActionListener
         fenster.add(panel, BorderLayout.CENTER);
         panel.setBackground(new Color(100,100,100));
 
-        button = new JButton ("Linie");
+        button = new JButton ("Speichern");
         top.add(button); 
         button.addActionListener(this);
 
-        button2 = new JButton("Kreis");
+        button2 = new JButton("Laden");
         top.add(button2);
         button2.addActionListener(this);
-
+        
+        button3 = new JButton("Clear");
+        top.add(button3);
+        button3.addActionListener(this);
+        
+        button4 = new JButton("Tiefensuche");
+        top.add(button4);
+        button4.addActionListener(this);
+        
+        
         fenster.setVisible(true);
         panel.addMouseMotionListener(new MouseMotionListener(){
                 public void mouseDragged(MouseEvent e){
@@ -68,9 +80,19 @@ public class Window implements ActionListener
     }
 
     public void actionPerformed(ActionEvent e){
-        if (e.getSource() == this.button) 
-            if (e.getSource() == this.button2) 
-                fenster.repaint();
+        if (e.getSource() == this.button) {
+            panel.save();
+        }
+        if (e.getSource() == this.button2) {
+            panel.load();
+        }
+        if(e.getSource() == this.button3){
+            panel.clear();
+        }
+        if(e.getSource() == this.button4){
+            panel.tiefensuche();
+        }
+        fenster.repaint();      
     }
 }
 
diff --git a/test.txt b/test.txt
new file mode 100644
index 0000000..3fdabc1
--- /dev/null
+++ b/test.txt
@@ -0,0 +1,8 @@
+N 1 74 87
+N 2 154 202
+N 3 284 90
+N 4 156 113
+N 5 284 155
+N 6 245 233
+E 2 4 1 0
+E 4 1 1 0