Preference Node in Java

[Aakarshan.d]

Hello, I am learning java programming language and while learning it, I am not able to understand the concept of the Preference Node in Java. I have tried it to learn from the internet, but I am not able to get the solution for it. If you are having any idea regarding it, then please help me to achieve it. Or if you know the source from which I can able to get the information about it. So, reply me about it.

[Katty]

A node is a hierarchical collection of preference data. This class allows applications to store and retrieve user and system preference and configuration data. This data is stored persistently in an implementation-dependent backing store. Typical implementations include flat files, OS-specific registries, directory servers and SQL databases. The user of this class needn't be concerned with details of the backing store. There are two separate trees of preference nodes, one for user preferences and one for system preferences. Each user has a separate user preference tree, and all users in a given system share the same system preference tree. The precise description of "user" and "system" will vary from implementation to implementation. Typical information stored in the user preference tree might include font choice, color choice, or preferred window location and size for a particular application. Typical information stored in the system preference tree might include installation configuration data for an application.

[kelfro]

Hello, if you want to use the program from which you can able to get the solution for the preference node in java then you must need to make use of the below mentioned simplest code for it:

import java.util.prefs.*;
import java.io.IOException;
public class prefNode
{
  public static void main(String[] args) throws IOException, BackingStoreException 
{ 
        Preferences.userRoot().node("Techarena Team");
        Preferences preferences = Preferences.userRoot();
        preferences.exportSubtree(System.out);
}
}

[Zecho]

If you want to create a preference node in java then it is just needed to make use of the code below for getting the solution:

Preferences preferences = Preferences.systemNodeForPackage(java.lang.String.class); 
preferences = Preferences.systemRoot().node("/java/lang/String"); 
preferences = Preferences.systemRoot().node("/javax/swing"); 
preferences = preferences.node("Test/html"); 
preferences = Preferences.userNodeForPackage(com.Testing.TestClass.class); 
preferences = Preferences.userRoot().node("/com/Testing"); 
preferences = Preferences.userRoot().node("/javax/swing"); 
preferences = preferences.node("Test/html");

[Reegan]

Hello, preference class in java provides different methods. Some of them are as below:

• absolutePath()
• addPreferenceChangeListener(PreferenceChangeListener pcl)
• clear()
• exportNode(OutputStream os)
• flush()
• importPreferences(InputStream is)
• isUserNode()
• put(String key, String value)
• putInt(String key, int value)
• putLong(String key, long value)
• remove(String key)
• removeNode()
• sync()
• systemRoot()
• toString()
• userRoot()

[Praetor]

Hi, If you want to achieve the node from the preference then you need to be use the code provided below:

import java.util.prefs.Preferences;
public class TestPreference 
{
  public static void main(String args[]) throws Exception 
{
    Preferences preference = Preferences.userRoot();
    Preferences preference1 = preference.node("TestPreference");
    preference1.put("A", "a");
    preference1.put("B", "b");
    preference1.put("C", "c");
    System.out.println("userNodeForPackage: " + Preferences.userNodeForPackage(TestPreference.class));

  }
}