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Java

“Core Java” is Sun’s term, used to refer to Java SE, the standard edition and a set of related technologies, like the Java VM, CORBA, etc. This is mostly to differentiate from others like Java ME or Java EE. “Core Java” is Oracle’s definition and refers to subset of Java SE technologies.

The Core Java technologies and application programming interfaces (APIs) are the foundation of the Java Platform, Standard Edition (Java SE). They are used in all classes of Java programming, from desktop applications to Java EE applications.

  1. Java 8 – Check if Date or LocalDate is Weekend
  2. Java FileWriter
  3. Java InputStreamReader
  4. Java StringReader
  5. Java FileReader
  6. Installing Java on 64 bit Windows
  7. Java Hello World Program
  8. Java Read File from Classpath
  9. yield keyword in Java
  10. Java 8 – Period
  11. Java 8 – TemporalAdjusters
  12. Java – Date Formatting
  13. Java 8 – Date Parsing and Validation
  14. Java – Get All Dates Between Two Dates
  15. Java 8 – Calculate days between two dates
  16. Java – Calculate business days between two dates
  17. Java 8 – Add or subtract N business days to date
  18. Java 8 – DayOfWeek
  19. Java 8 – TemporalQuery
  20. Java – Get Next and Previous Date
  21. Java UUID Generator Example
  22. Pairs in Java
  23. Java 8 – Parse string to date-time in UTC
  24. Java 8 ResolverStyle.STRICT
  25. Regex – Match any character or set of characters
  26. Regex – Match Start or End of String (Line Anchors)
  27. Java DelayQueue
  28. ExecutorService – shutdown(), shutdownNow() and awaitTermination​()
  29. ExecutorService – Cancel a task in executor
  30. ScheduledExecutorService – Running task in executor after delay
  31. ExecutorService invokeAll()
  32. ExecutorService invokeAny()
  33. Callable Future Example
  34. Executor RejectedExecutionHandler
  35. ExecutorService in Java
  36. Compare LocalDateTime instances
  37. Compare LocalDate instances
  38. A Guide to AtomicInteger in Java
  39. Format date/timestamp in 12 hours pattern
  40. LocalDate format() API
  41. Java – Check given year is leap year or not?
  42. Java 8 – Compare ZonedDateTime
  43. Format ZonedDateTime to String in Java 8
  44. Convert between LocalDate and ZonedDateTime
  45. Java 8 – Convert between LocalDateTime and LocalDate
  46. ZonedDateTime parse()
  47. LocalDateTime parse()
  48. LocalDate parse()
  49. Java ZonedDateTime class
  50. Java LocalDateTime class
  51. Java LocalTime class
  52. Java LocalDate class
  53. JMeter tutorial
  54. How to get union between two arrays
  55. How to get intersection between two arrays
  56. Java Command Line Arguments
  57. A Guide to Recursion in Java
  58. Java instance initializer blocks
  59. Java – Naming Conventions
  60. Difference between this and super in Java
  61. strictfp modifier in Java
  62. Difference between final, finally and finalize in Java
  63. Java extends vs implements keywords
  64. Java instanceof operator
  65. Java throw and throws keywords
  66. Java synchronized keyword
  67. Java try catch finally blocks
  68. Java boolean keyword
  69. Java assert keyword – assertion in Java
  70. Java abstract keyword – abstract classes and methods
  71. Java Flow Control Statements
  72. Java CopyOnWriteArraySet class
  73. Java CopyOnWriteArrayList class
  74. Java TransferQueue – Java LinkedTransferQueue class
  75. Java ArrayBlockingQueue class
  76. Java PriorityBlockingQueue class
  77. Java PriorityQueue class
  78. Java Spliterator interface
  79. Java ListIterator interface
  80. Java Iterator interface example
  81. Java Comparator interface example
  82. Java Comparable interface example
  83. Java LinkedList class
  84. Java TreeSet class
  85. Java LinkedHashSet class
  86. Java HashSet class
  87. Java Hashtable class
  88. Java TreeMap class
  89. Java LinkedHashMap class
  90. How to clone HashMap – Shallow and Deep Copy
  91. How to remove duplicate elements in ArrayList
  92. Java – Remove duplicates from array
  93. How to Synchronize HashMap in Java
  94. How to join or merge two hashmaps in Java
  95. How to compare two hashmaps in Java
  96. ArrayList spliterator() method example
  97. ArrayList removeIf() – remove objects by field
  98. ArrayList sort() – Sort list of objects by field
  99. ArrayList replaceAll() method example
  100. ArrayList retainAll() method example
  101. ArrayList removeAll() – remove all occurrences from list
  102. ArrayList remove() method example
  103. ArrayList listIterator() method example
  104. ArrayList forEach() example – Java 8
  105. ArrayList clone() – Deep copy and shallow copy
  106. ArrayList clear() – Empty ArrayList in Java
  107. ArrayList addAll() method example
  108. Java tuple – Working with tuples in Java
  109. ArrayList add() method example
  110. Difference between LinkedList vs ArrayList in Java
  111. Difference between ArrayList vs Vector in Java
  112. How to convert HashSet to ArrayList in Java
  113. Convert array to list in Java
  114. How to convert ArrayList to String Array in Java
  115. How to convert LinkedList to ArrayList in Java
  116. How to convert Vector to ArrayList in Java
  117. Java ArrayList toArray() – Convert ArrayList to Array
  118. Java ArrayList contains() – Check if element exists
  119. Java ArrayList ensureCapacity() method example
  120. How to replace existing element in ArrayList
  121. Check if ArrayList is empty or not in Java
  122. Java format string to phone number with dashes – (123) 456-6789 pattern
  123. Get first 4 characters of String in Java
  124. Get last 4 characters of String in Java
  125. How to empty or clear ArrayList in Java
  126. How to merge two ArrayLists in Java
  127. How to serialize and deserialize ArrayList in Java
  128. How to swap two elements in ArrayList in Java
  129. How to synchronize ArrayList in Java
  130. How to compare two ArrayLists in Java
  131. ArrayList get() – Getting Element at Index
  132. Arraylist indexOf() – Get index of element in arraylist
  133. Arraylist lastIndexOf() – Get last index of element in arraylist in Java
  134. Get sublist of ArrayList – ArrayList subList() method
  135. Add multiple items to ArrayList in Java
  136. How to remove element from ArrayList in Java
  137. ArrayList add/replace element at specified index in Java
  138. How to iterate through ArrayList of objects in Java
  139. How to initialize ArrayList in Java
  140. Java String intern() method example
  141. Java String contains() method example
  142. Java String toLowerCase() method example
  143. Java String toUpperCase() method example
  144. Java String split()
  145. Java String replaceAll() method example
  146. Java String replaceFirst() method example
  147. Java String replace() method example
  148. Java String concat() method example
  149. Java String substring()
  150. Java String lastIndexOf() method example
  151. Java String indexOf() method example
  152. Java String hashCode() method example
  153. Java String endsWith() method example
  154. Java String startsWith() example
  155. Java String compareToIgnoreCase() method example
  156. Java String compareTo() method example
  157. Java String equalsIgnoreCase() method – Case-insensitive comparison
  158. Java String equals() method – Java compare strings
  159. Java String charAt() method example
  160. Java – Find duplicate characters in String
  161. Java hashCode() and equals() – Contract, rules and best practices
  162. Java convert float to String – Format to N decimal points
  163. Java StackTrace to String Example
  164. [Solved] java.security.InvalidKeyException: Parameters missing
  165. Java AES 256 Encryption Decryption Example
  166. Java – Right pad a string with spaces or zeros
  167. Java – Left pad a string with spaces or zeros
  168. Java 8 StringJoiner Example
  169. Java remove extra white spaces between words in String
  170. Java remove leading whitespaces from String
  171. Java remove trailing whitespaces from String
  172. Java reverse string using recursion
  173. Reverse words in string in Java
  174. Java array contains – ArrayList contains example
  175. Convert long to String in Java
  176. Convert String to Long in Java
  177. Convert int to String in Java
  178. Java Wrapper Classes – Autoboxing and Unboxing Example
  179. Convert String to Title Case in Java
  180. Java group by sort – multiple comparators example
  181. Java xpath example – Evaluate xpath on xml file
  182. Java 8 xpath example – Evaluate xpath on string
  183. Java XPath – Check if node or attribute exists?
  184. Java XPath expression examples
  185. Find xml element with attribute value using xpath in Java
  186. Java XML to String – Write XML Object to File Example
  187. Java String to XML – Parse String to XML DOM Example
  188. Java Unescape HTML to String Example
  189. Java Escape HTML – Encode String to HTML Example
  190. Java Convert XML to Properties – Read Properties from XML File
  191. Java Convert Properties File to XML File
  192. Java Read XML with StAX Parser – Cursor & Iterator APIs
  193. Java Array Clone – Deep Copy vs Shallow Copy
  194. Java Array Deep Copy Example
  195. Java Sort String Characters Alphabetically
  196. Java 8 – Comparator thenComparing() example
  197. Java Collections sort()
  198. How to sort ArrayList in Java
  199. Java Array Sort – Arrays.sort() Example
  200. Java String to String[] Example