Checkpoint of my Swing UI refactoring. Usable for output-only programs, but only barely.

src/main/java/com/loomcom/symon/Preferences.java

@@ -0,0 +1,18 @@
+package com.loomcom.symon;
+
+import javax.swing.*;
+
+public interface Preferences {
+
+    public static final int DEFAULT_PROGRAM_LOAD_ADDRESS = 0x0300;
+
+    public static final int DEFAULT_ACIA_ADDRESS = 0xc000;
+
+    public JDialog getDialog();
+
+    public int getProgramStartAddress();
+
+    public int getAciaAddress();
+
+    public void updateUi();
+}