1 files changed, 19 insertions, 0 deletions
diff --git a/tutorial/examples/mixin/Undo.oj b/tutorial/examples/mixin/Undo.oj
new file mode 100644
index 0000000..66ad9a9
--- /dev/null
+++ b/tutorial/examples/mixin/Undo.oj
@@ -0,0 +1,19 @@
+package examples.mixin;
+
+
+public class Undo
+{
+    inherited String getText();
+    inherited void setText(String s);
+
+    String lastText;
+
+    public void setText(String s) {
+    lastText = getText();
+    super.setText(s);
+    }
+
+    public void undo() {
+    super.setText(lastText);
+    }
+}