Determining If a Preference Node Contains a Specific Key

This section demonstrates you to determine whether the Preference Node contains a Specific key or not.

Determining If a Preference Node Contains a Specific Key

Determining If a Preference Node Contains a Specific Key

     

This section demonstrates you to determine whether the Preference Node contains a  Specific key or not. You can see in the given example that we have create a method contain(String key) of Boolean type. This method returns true if the node contains the specified key otherwise it returns false. In order to get the Preference node, we have used Preferences.userRoot().node("/Roseindia Employees"). 

Here is the code of SpecificKey.java

import java.io.*;
import java.util.prefs.*;

public class SpecificKey{
public static boolean contain(String key) {
  Preferences node = Preferences.userRoot().node("/Roseindia Employees");
  return node.get(key, null) != null;
  }
public static void main(String[]args){
SpecificKey s=new SpecificKey();
boolean b=s.contain("EmployeeName1");
System.out.println(b);
  }
}

When you run the above program, the method search the specified key 'EmployeeName 1' in the Preference node 'Roseindia Employees'. If it finds, it will return true otherwise false. Here, the condition is true.

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