Java Interview Coding Programs (244 Topics with Solutions) – Complete Guide

 Intro: Welcome to DailyCodeHub java Interview Coding Programs Page! Here you will find all java coding program topics with solutions. choose your topic below and start learning

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SECTION 1 : DATA TYPES & VARIABLES

1. int Programs
2. double Programs
3. char Programs
4. boolean Programs
5. Variable Declaration Programs
6. Constants (final) Programs
7. Type Promotion Programs
8. Implicit Type Conversion Programs
9. Variable Scope Programs
10. Literals in Java Programs
11. Overflow & Underflow Programs
12. Type Inference (var) Programs
13. Primitive vs Non-Primitive Programs
14. Data Type Comparison Programs
15. Expression Evaluation Programs

SECTION 2 : TYPE CASTING & WRAPPER CLASSES

12. Implicit Casting Programs
13. Explicit Casting Programs
14. String to int Programs
15. int to String Programs
16. Wrapper Classes Programs
17. Autoboxing Programs
18. Unboxing Programs

SECTION 3 : OPERATORS

19. Arithmetic Operators Programs
20. Comparison Operators Programs
21. Logical Operators Programs
22. Bitwise Operators Programs
23. Assignment Operators Programs
24. Ternary Operator Programs
25. Operator Precedence Programs
26. Shift Operators Programs
27. instanceof Operator Programs

SECTION 4 : CONTROL STATEMENTS

28. if Statement Programs
29. if else Programs
30. if else if Programs
31. Nested if Programs
32. switch Case Programs
33. Enhanced switch Programs

SECTION 5 : LOOPS

34. for Loop Programs
35. while Loop Programs
36. do while Programs
37. Nested Loop Programs
38. break Programs
39. continue Programs
40. Infinite Loop Programs
41. for-each Loop Programs

SECTION 6 : ARRAYS

42. 1D Array Programs
43. 2D Array Programs
44. Array Declaration Programs
45. Array Initialization Programs
46. Array Traversal Programs
47. Array Copy Programs
48. Array Reverse Programs
49. Jagged Array Programs

SECTION 7 : STRINGS

50. String Declaration Programs
51. String Methods Programs
52. String Concatenation Programs
53. String Comparison Programs
54. StringBuffer Programs
55. StringBuilder Programs
56. Immutable String Programs
57. String Reverse Programs
58. Palindrome Programs
59. String Pool Programs
60. String Intern Programs
61. equals( ) vs == Programs
62. String vs StringBuilder vs StringBuffer

SECTION 8 : METHODS

63. Method Declaration Programs
64. Method Overloading Programs
65. Method Overriding Programs
66. Static Methods Programs
67. Instance Methods Programs
68. Recursion Programs
69. Return Type Programs

SECTION 9 : OOPs

70. Class & Object Programs
71. Constructor Programs
72. Default Constructor Programs
73. Parameterized Constructor Programs
74. Copy Constructor Programs
75. Encapsulation Programs
76. Inheritance Programs
77. Single Inheritance Programs
78. Multilevel Inheritance Programs
79. Hierarchical Inheritance Programs
80. Polymorphism Programs
81. Abstraction Programs
82. Interface Programs
83. Abstract Class Programs

SECTION 10 : OBJECT CLASS METHODS

84. toString( ) Programs
85. equals( ) Programs
86. hashCode( ) Programs
87. clone( ) Programs
88. finalize( ) Programs

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SECTION 11 : KEYWORDS

89. final Keyword Programs
90. finally Keyword Programs
91. finalize Keyword Programs
92. this Keyword Programs
93. super Keyword Programs
94. static Keyword Programs
95. volatile Keyword Programs
96. transient Keyword Programs
97. var Keyword Programs

SECTION 12 : ACCESS MODIFIERS

98. public Programs
99. private Programs
100. protected Programs
101. default Programs

SECTION 13 : INNER CLASSES

102. Inner Class Programs
103. Static Nested Class Programs
104. Local Inner Class Programs
105. Anonymous Inner Class Programs

SECTION 14 : PACKAGES

106. Package Creation Programs
107. Package Import Programs
108. User Defined Packages
109. Static Import Programs

SECTION 15 : EXCEPTION HANDLING

110. try catch Programs
111. Multiple catch Programs
112. finally Block Programs
113. throw Keyword Programs
114. throws Keyword Programs
115. Custom Exception Programs

SECTION 16 : MULTITHREADING

116. Thread Creation Programs
117. Runnable Interface Programs
118. Thread Lifecycle Programs
119. Synchronization Programs
120. Thread Priority Programs
121. Daemon Threads Programs
122. Inter-thread Communication

SECTION 17 : CONCURRENCY (ADVANCED)

123. ExecutorService Programs
124. Callable & Future Programs
125. ForkJoinPool Programs
126. Concurrent Collections Programs
127. Atomic Classes Programs

SECTION 18 : FILE HANDLING

128. File Class Programs
129. FileReader Programs
130. FileWriter Programs
131. BufferedReader Programs
132. BufferedWriter Programs
133. PrintWriter Programs
134. FileInputStream Programs
135. FileOutputStream Programs

SECTION 19 : NIO

136. NIO Basics Programs
137. Path & Paths Programs
138. Files Class Programs
139. Buffers Programs
140. Channels Programs

SECTION 20 : COLLECTION FRAMEWORK

141. List Programs
142. ArrayList Programs
143. LinkedList Programs
144. Vector Programs
145. Stack Programs
146. Set Programs
147. HashSet Programs
148. LinkedHashSet Programs
149. TreeSet Programs
150. Map Programs
151. HashMap Programs
152. LinkedHashMap Programs
153. TreeMap Programs
154. Hashtable Programs
155. Iterator Programs
156. Comparable & Comparator Programs

SECTION 21 : JAVA 8 FEATURES

157. Lambda Expressions Programs
158. Functional Interface Programs
159. Stream API Programs
160. forEach Programs
161. Method Reference Programs
162. Optional Class Programs
163. Default Methods Programs
164. Static Methods in Interface

SECTION 22 : STREAM API ADVANCED

165. Stream Intermediate Operations
166. Stream Terminal Operations
167. Parallel Streams Programs
168. Collectors Programs

SECTION 23 : DATE & TIME API

169. LocalDate Programs
170. LocalTime Programs
171. LocalDateTime Programs
172. Date Formatting Programs
173. Time Zone Programs

SECTION 24 : ENUMS & ANNOTATIONS

174. Enum Programs
175. Annotation Programs
176. Custom Annotations
177. Built-in Annotations Deep
178. Repeatable Annotations

SECTION 25 : INPUT & OUTPUT

179. Scanner Class Programs
180. Console Input Programs
181. Command Line Arguments

SECTION 26 : JDBC

182. JDBC Connection Programs
183. Statement Programs
184. PreparedStatement Programs
185. ResultSet Programs
186. CRUD Operations Programs

SECTION 27 : NETWORKING

187. Socket Programming
188. ServerSocket Programs
189. URLConnection Programs

SECTION 28 : SECURITY

190. Java Security Basics
191. Encryption & Decryption Programs
192. MessageDigest Programs

SECTION 29 : INTERNATIONALIZATION

193. Locale Programs
194. ResourceBundle Programs
195. Formatting Numbers & Dates

SECTION 30 : JVM INTERNALS

196. ClassLoader Programs
197. Bytecode Basics
198. JIT Compiler Basics
199. Method Area Programs
200. Stack Frames Basics
201. Escape Analysis
202. Inlining (JIT Optimization)

SECTION 31 : MEMORY & JVM BASICS

203. JVM Architecture Basics
204. JRE vs JDK Programs
205. Heap vs Stack Programs
206. Garbage Collection Deep Programs

SECTION 32 : GARBAGE COLLECTION TYPES

207. Serial GC
208. Parallel GC
209. G1 GC
210. ZGC

SECTION 33 : CLONING & IMMUTABILITY

211. Shallow Copy Programs
212. Deep Copy Programs
213. Immutable Class Programs

SECTION 34 : ADVANCED JAVA

214. Serialization Programs
215. Deserialization Programs
216. Reflection API Programs
217. Cloning Programs
218. Garbage Collection Programs
219. Marker Interfaces
220. Transient Keyword Deep
221. Dynamic Proxy Programs
222. Method Handles Programs

SECTION 35 : JAVA UTIL CLASSES

223. Arrays Class Programs
224. Collections Class Programs
225. Objects Class Programs
226. Math Class Programs
227. Random Class Programs

SECTION 36 : JAVA 9+ FEATURES

228. Modules (JPMS)
229. Records (Java 14+)
230. Sealed Classes (Java 17+)

SECTION 37 : MISCELLANEOUS

231. Java Coding Tricks
232. One Liner Programs
233. Debugging Programs
234. Performance Optimization
235. Memory Management
236. Best Practices (Coding Standards)

SECTION 38 : INTERVIEW IMPORTANT PROGRAMS ⭐

237. Palindrome Programs
238. Prime Number Programs
239. Fibonacci Programs
240. Factorial Programs
241. Armstrong Number Programs
242. Reverse Number Programs
243. Swap Numbers Programs
244. Pattern Programs