Java Util Package - Utility Package of Java

This secton provides the components of java util package.

Java Util Package - Utility Package of Java

This secton provides the components of java util package.

Java Util Package - Utility Package of Java

Java Util Package - Utility Package of Java

     

Java Utility package is one of the most commonly used packages in the java program. The Utility Package of Java consist of the following components:

  • collections framework
      
  • legacy collection classes
      
  • event model
      
  • date and time facilities
      
  • internationalization
      
  • miscellaneous utility classes such as string tokenizer, random-number generator and bit array
      

Here are some of the description of the utility classes of this package: Data Structure Classes  
Data Structure Classes are very useful classes for implementing standard computer science data structures: including BitSet, Dictionary, Hashtable, Stack and Vector. The Enumeration interface of java.util package is used to count through a set of values.

FOR COMPLETE TUTORIAL ON DATA STRUCTURE OF java.util PACKAGE CLICK HERE  

Date  
The Date class is used to manipulate calendar dates in a system-independent fashion. 

StringTokenizer  
This StringTokenizer class is used to convert a String of text into its tokens. 

Properties  
The properties table contains key/value pairs where both the key and the value are Strings and the class is used by the System class to implement System properties. 

Observer and Observable  
Classes that implement the Observer interface can "watch" Observable objects for state changes. When an Observable object changes it notifies all of its Observers of the change. 

Random-Number Generator  
The Random Number Generator class is used to generate the random-numbers. 

Enumeration  
The Enumeration interface defines a generic programming interface for iterating through a set of values.

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