Getting and Setting Java Type Values in a Preference

As you know that a preference node holds only string values. Therefore the Preferences class provides some convenient methods to convert the Java types into string.

Getting and Setting Java Type Values in a Preference

As you know that a preference node holds only string values. Therefore the Preferences class provides some convenient methods to convert the Java types into string.

Getting and Setting Java Type Values in a Preference

Getting and Setting Java Type Values in a Preference

     

This section demonstrates you to set and get the Java Type values in a Preference. 

As you know that a preference node holds only string values. Therefore the Preferences class provides some convenient methods to convert the Java types into string. For example, the method prefs.putBoolean("Boolean", true)  converts a Boolean value into a string and then saves the string value and the method prefs.putBoolean("Boolean", true) converts the string back into the Boolean value. Similarly the other Java types are converted into the string. You can see in the given example that we have used the conversion methods for Boolean, int, long, float, double. To specify all these Java  Types in the Preference tree, we have define a node 'Java Types'.

 

 

 

 

Here is the code of JavaTypes.java

import java.util.prefs.*;
import java.io.*;
public class JavaTypes{
public static void main(String []args){

 Preferences prefs = Preferences.userRoot().node("/Java Types");
 prefs.put("String", "Hello");  
 prefs.putBoolean("Boolean", true); 
 prefs.putInt("Integer", 1);  
 prefs.putLong("Long", 123456L); 
 prefs.putFloat("Float", 12.3F);  
 prefs.putDouble("Double", 12.3); 
 
 String s = prefs.get("String", "Hello"); 
 boolean b = prefs.getBoolean("Boolean", true); 
 int i = prefs.getInt("Integer", 1);  
 long l = prefs.getLong("Long", 123456L); 
 float f = prefs.getFloat("Float", 12.5F);  
 double d = prefs.getDouble("Double", 12.5);  

System.out.println(s+" = is of String type");
System.out.println(b+" = is of Boolean type");
System.out.println(i+" = is of Integer type");
System.out.println(l+" = is of Long type");
System.out.println(f+" = is of Float type");
System.out.println(d+" = is of Double type");
}
}

Output will be displayed as:

Download Source Code:

 

Tutorials

  1. Java util package Examples
  2. Java Util Package - Utility Package of Java
  3. Generating Random Number
  4. Breaking the String into Words
  5. Listing all available Locales
  6. Setting the default Locale
  7. Associate a value with an object
  8. Comparing Arrays
  9. Shuffling the Element of a List or Array
  10. Collections Framework
  11. Collection Iterate Example
  12. Converting Collection to an Array
  13. Converting an Array to a Collection
  14. Implement the Queue in Java
  15. Implementing a Stack in Java
  16. Implementing a Least-Recently-Used(LRU) Cache
  17. Creating a Copy of a Collection
  18. Making a Collection Read-Only
  19. Sorting elements of a Collection
  20. Creating a Hash Table
  21. Finding an Element in a Sorted Array
  22. Read the Key-Value of Property File in Java
  23. Get All Keys and Values of the Properties files in Java
  24. Write the Keys and Values of the Properties files in Java
  25. Scheduling a Timer Task
  26. Getting the Current Time
  27. Getting Information of All Available Time Zones
  28. Getting the current date
  29. Determining the Number of Days in a Month
  30. Comparing Dates in Java
  31. Determining the actual age from date of birth in Java
  32. Determining If a Year is a Leap Year in Java
  33. Determining the Day-of-Week for a Particular Date
  34. What is a JAR file in Java
  35. Creating a JAR file in Java
  36. Viewing contents of a JAR File
  37. Listing the Main Attributes in a JAR File Manifest
  38. Creating a ZIP file in Java
  39. Listing Contents of a ZIP File
  40. Unzip a ZIP File