java preference. javapreferences

Java中的Preferences的基本使用方法：

Java代码

import java.util.prefs.Preferences;

public class PreferencesDemo {
	public static void main(String[] args) throws Exception {
		Preferences prefs = Preferences.userNodeForPackage(PreferencesDemo.class);
		prefs.put("Location", "Oz");
		prefs.put("Footwear", "Ruby Slippers");
		prefs.putInt("Companions", 4);
		prefs.putBoolean("Are there witches?", true);
		int usageCount = prefs.getInt("UsageCount", 0);
		usageCount++;
		prefs.putInt("UsageCount", usageCount);
		for (String key : prefs.keys()) {
			System.out.println(key + ": " + prefs.get(key, null));
		}
		// You must always provide a default value:
		System.out.println("How many companions does Dorothy have? " + prefs.getInt("Companions", 0));
	}
}

import java.util.prefs.Preferences;

public class PreferencesDemo {
	public static void main(String[] args) throws Exception {
		Preferences prefs = Preferences.userNodeForPackage(PreferencesDemo.class);
		prefs.put("Location", "Oz");
		prefs.put("Footwear", "Ruby Slippers");
		prefs.putInt("Companions", 4);
		prefs.putBoolean("Are there witches?", true);
		int usageCount = prefs.getInt("UsageCount", 0);
		usageCount++;
		prefs.putInt("UsageCount", usageCount);
		for (String key : prefs.keys()) {
			System.out.println(key + ": " + prefs.get(key, null));
		}
		// You must always provide a default value:
		System.out.println("How many companions does Dorothy have? " + prefs.getInt("Companions", 0));
	}
}

1. import
2. 
3. public class
4. public static 
void main(String[] args) throws
5. Preferences prefs = Preferences.userNodeForPackage(PreferencesDemo.class);

6. prefs.put("Location", "Oz");

7. prefs.put("Footwear", "Ruby Slippers");

8. prefs.putInt("Companions", 4);

9. prefs.putBoolean("Are there witches?", 
true); 
10. int usageCount = prefs.getInt("UsageCount",
0); 
11. usageCount++; 
12. prefs.putInt("UsageCount", usageCount); 
13. for
14. System.out.println(key + ": " + prefs.get(key, 
null)); 
15. } 
16. // You must always provide a default value: 
17. System.out.println("How many companions does Dorothy have? " + prefs.getInt("Companions",
0)); 
18. } 
19. }

代码来自：《Thinking in Java》

详细使用，请参考对应的JDK文档！=^_^=