1    package futils; 
2     
3    import java.util.prefs.Preferences; 
4    import java.util.prefs.BackingStoreException; 
5     
6    /** 
7     * Copyright DocJava, inc. User: lyon 
8     * <p/> 
9     * Date: Nov 7, 2004 
10    * <p/> 
11    * Time: 6:55:44 AM 
12    */ 
13   public class PreferencesExample { 
14       public static void main(String[] args) { 
15           putData("\\this is a test\\:"); 
16           printData(); 
17           printKeys(); 
18    
19       } 
20    
21       private static void printData() { 
22           System.out.println(getData()); 
23       } 
24       public static void printKeys(){ 
25           Preferences p = Preferences.userRoot(); 
26           try { 
27               String sa[] = p.keys(); 
28               for (int i=0; i < sa.length; i++) 
29                   System.out.println(sa[i]); 
30           } catch (BackingStoreException e) { 
31               e.printStackTrace(); 
32           } 
33       } 
34       private static String getData() { 
35           Preferences p = Preferences.userRoot(); 
36           return p.get("com.docjava.foo", null); 
37       } 
38    
39       private static void putData(String s) { 
40           Preferences p = Preferences.userRoot(); 
41           p.put("com.docjava.foo", s); 
42       } 
43   } 
44