diff -r 8ddf4af937d7 -r 5bab2e971333 src/de/uapcore/sudoku/ActionHandler.java
--- a/src/de/uapcore/sudoku/ActionHandler.java	Sat Jan 26 19:34:31 2013 +0100
+++ b/src/de/uapcore/sudoku/ActionHandler.java	Sun Jan 27 15:03:57 2013 +0100
@@ -28,6 +28,9 @@
 
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.io.File;
+import java.io.IOException;
+import javax.swing.JFileChooser;
 import javax.swing.JOptionPane;
 
 /**
@@ -57,19 +60,60 @@
     }
     
     private boolean chooseSaveFilename() {
-        // TODO: fileselector
-        return false;
+        JFileChooser fc = new JFileChooser(".");
+        fc.setMultiSelectionEnabled(false);
+        if (fc.showSaveDialog(field) == JFileChooser.APPROVE_OPTION) {
+            File f = fc.getSelectedFile();
+            if (f.exists()) {
+                int result = JOptionPane.showConfirmDialog(field,
+                        "Bereits existierende Datei überschreiben?", "Sudoku",
+                        JOptionPane.YES_NO_OPTION);
+                if (result == JOptionPane.YES_OPTION) {
+                    doc.setFilename(f.getAbsolutePath());
+                    return true;
+                } else {
+                    return false;
+                }
+            } else {
+                doc.setFilename(f.getAbsolutePath());
+                return true;
+            }
+        } else {
+            return false;
+        }
     }
     
-    private boolean save() {
-        if (!doc.isFilenameSet()) {
+    private void open() {
+        JFileChooser fc = new JFileChooser(".");
+        fc.setMultiSelectionEnabled(false);
+        if (fc.showOpenDialog(field) == JFileChooser.APPROVE_OPTION) {
+            File f = fc.getSelectedFile();
+            doc.setFilename(f.getAbsolutePath());
+            try {
+                doc.load(field);
+            } catch (IOException e) {
+                JOptionPane.showMessageDialog(field,
+                    "Datei konnte nicht geladen werden: "+e.getMessage(),
+                    "Sudoku", JOptionPane.ERROR_MESSAGE);
+            }
+        }
+    }
+    
+    private boolean save(boolean rename) {
+        if (!doc.isFilenameSet() || rename) {
             if (!chooseSaveFilename()) {
                 return false;
             }
         }
         if (solver.check(field)) {
             field.setAllCellsModified(false);
-            // TODO: save to file
+            try {
+                doc.save(field);
+            } catch (IOException e) {
+                JOptionPane.showMessageDialog(field,
+                    "Datei konnte nicht gespeichert werden: "+e.getMessage(),
+                    "Sudoku", JOptionPane.ERROR_MESSAGE);
+            }
             return true;
         } else {
             JOptionPane.showMessageDialog(field,
@@ -100,7 +144,7 @@
                     "Das Feld ist ungespeichert - jetzt speichern?",
                     "Sudoku", JOptionPane.YES_NO_CANCEL_OPTION);
             if (result == JOptionPane.YES_OPTION) {
-                if (save()) {
+                if (save(false)) {
                     proceed = true;
                 }
             } else if (result == JOptionPane.NO_OPTION) {
@@ -121,8 +165,14 @@
                 field.clear();
             }
             break;
+        case OPEN:
+            open();
+            break;
         case SAVE:
-            save();
+            save(false);
+            break;
+        case SAVE_AS:
+            save(true);
             break;
         case CHECK:
             check();