Java Programming Exercises

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Practice Java programming through 200+ hands-on coding challenges. Perfect for beginners to advance their skills with real-world projects covering data structures, algorithms, OOP, and core Java concepts.

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Exercises

Index	Name	Difficulty	Practice
001	Accessing Elements in a LinkedList	Beginner	Start Challenge
002	Accessing Elements of a HashMap	Beginner	Start Challenge
003	Accessing Static Properties from Another Class	Beginner	Start Challenge
004	Checking String Equality	Beginner	Start Challenge
005	Create Linked List with Index	Intermediate	Start Challenge
006	Finding Minimum and Maximum Student Marks	Beginner	Start Challenge
007	Implement Deque Data Structure	Intermediate	Start Challenge
008	Implementing Lambda Expression with Parameters	Beginner	Start Challenge
009	Implementing Multilevel Inheritance	Beginner	Start Challenge
010	Remove Second Element From ArrayList	Beginner	Start Challenge
011	Sort Players' Ages Ascending Order	Beginner	Start Challenge
012	Class Methods Retriever Information	Intermediate	Start Challenge
013	Concurrent Execution of Threads	Beginner	Start Challenge
014	Counting Character Occurrences	Beginner	Start Challenge
015	Custom Regular Expression	Intermediate	Start Challenge
016	Data Sharing Problem in Ticketing System	Beginner	Start Challenge
017	Default Methods in Multiple Interfaces	Beginner	Start Challenge
018	Draw Geometric Shapes	Intermediate	Start Challenge
019	From One-Fourth to 0	Intermediate	Start Challenge
020	Implementing Queue Manually	Intermediate	Start Challenge
021	Lambda Expressions For Data Operations	Intermediate	Start Challenge
022	Matrix element information printing	Intermediate	Start Challenge
023	Remove Duplicate Numbers	Beginner	Start Challenge
024	Set a price for attractions tickets	Intermediate	Start Challenge
025	Sibling Money Division Game	Intermediate	Start Challenge
026	Simulating a Library	Beginner	Start Challenge
027	Solving Apple Distribution Problem with Exceptions	Intermediate	Start Challenge
028	Storing Data Information Using HashSet	Beginner	Start Challenge
029	Sum of Large Numbers	Intermediate	Start Challenge
030	Sum of Three-Digit Number's Digits	Intermediate	Start Challenge
031	The Only God	Beginner	Start Challenge
032	Usage of Stream	Intermediate	Start Challenge
033	Validating ID Card Number	Intermediate	Start Challenge
034	Simple Java Print Statement	Intermediate	Start Challenge
035	Implement Encryption and Decryption	Intermediate	Start Challenge
036	Access and Modify Student Name	Beginner	Start Challenge
037	Accessing Overridden Method of Superclass	Beginner	Start Challenge
038	Accessing Static Properties in a Class	Beginner	Start Challenge
039	Accessing Superclass Constructor	Beginner	Start Challenge
040	Adding Elements to ArrayList	Beginner	Start Challenge
041	Adding Elements to ArrayLists at Specific Index	Beginner	Start Challenge
042	Area Calculation Program using Abstraction	Beginner	Start Challenge
043	Calculate BMI Using Weight and Height	Beginner	Start Challenge
044	Calculate Cube Volume From Side	Beginner	Start Challenge
045	Calculate Employee Bonus Based Salary	Beginner	Start Challenge
046	Calculate Interest Based on Principal	Beginner	Start Challenge
047	Calculate Mean Height of Players	Beginner	Start Challenge
048	Calculate Percentage with Arrays	Beginner	Start Challenge
049	Calculate Rectangle Area Using Class	Beginner	Start Challenge
050	Calculate Rectangle Dimensions	Beginner	Start Challenge
051	Calculate Sum of Digits	Beginner	Start Challenge
052	Calculate the Factorial of a Number	Beginner	Start Challenge
053	Calculating Area of Two Triangles	Beginner	Start Challenge
054	Calculating Power of a Number	Beginner	Start Challenge
055	Calculating Standard Deviation in Java	Beginner	Start Challenge
056	Calculating Sum of Natural Numbers	Intermediate	Start Challenge
057	Calculating the Area of a Circle	Beginner	Start Challenge
058	Calculating the Area of a Square	Beginner	Start Challenge
059	Calling a Method Twice	Beginner	Start Challenge
060	Check Pass, Fail, or Invalid	Beginner	Start Challenge
061	Checking IcyHot Temperature Using Java	Beginner	Start Challenge
062	Comparing First and Last Array Elements	Beginner	Start Challenge
063	Continuously Sum Entered Numbers	Beginner	Start Challenge
064	Convert Between Kilometers and Miles Using Java	Beginner	Start Challenge
065	Count the Vowels in a String	Beginner	Start Challenge
066	Counting Digits In An Integer	Beginner	Start Challenge
067	Counting Occurrences of Character 'a'	Beginner	Start Challenge
068	Create a Calculator Program	Beginner	Start Challenge
069	Creating Enum Class - Size	Beginner	Start Challenge
070	Creating an Animal-Dog Hierarchy	Beginner	Start Challenge
071	Determine Factors of a Number	Beginner	Start Challenge
072	Determine Longer String From Inputs	Beginner	Start Challenge
073	Determine Maximum Handshakes Among Students	Beginner	Start Challenge
074	Determine Student Grade	Beginner	Start Challenge
075	Determining Equality of Two Arguments	Beginner	Start Challenge
076	Determining Even or Odd	Beginner	Start Challenge
077	Determining Harshad Number in Java	Beginner	Start Challenge
078	Determining If a Number is Armstrong	Beginner	Start Challenge
079	Determining Prime Number Status	Intermediate	Start Challenge
080	Distribute Chocolates To Children	Beginner	Start Challenge
081	Encapsulating Employee Salary Management	Beginner	Start Challenge
082	Enum Constants as Strings	Beginner	Start Challenge
083	Exclude Multiples of Three from Numbers	Beginner	Start Challenge
084	Fahrenheit to Celsius Conversion Program	Beginner	Start Challenge
085	Find Differences Between Two Hashsets	Beginner	Start Challenge
086	Find Intersection of Two HashSets	Beginner	Start Challenge
087	Find Largest Multiple Less Than 100	Beginner	Start Challenge
088	Find Smallest Array Element	Beginner	Start Challenge
089	Find Youngest Brother	Beginner	Start Challenge
090	Finding Nemo in ArrayList	Intermediate	Start Challenge
091	Finding Prime Numbers in Intervals	Intermediate	Start Challenge
092	Finding the GCD of Two Numbers	Intermediate	Start Challenge
093	Finding the Lowest Common Multiple	Intermediate	Start Challenge
094	FizzBuzz Program: User Input Explanation	Beginner	Start Challenge
095	Generate Multiplication Table Using Loops	Beginner	Start Challenge
096	Greatest Factor Excluding Itself	Beginner	Start Challenge
097	Identify Self-Dividing Numbers	Intermediate	Start Challenge
098	Identifying Abundant Numbers Using Java	Beginner	Start Challenge
099	Implement Interface to Calculate Square Area	Beginner	Start Challenge
100	Implementing a Queue Using a LinkedList	Intermediate	Start Challenge
101	Method Overloading for Different Parameters	Beginner	Start Challenge
102	Method Overloading with Different Parameter Types	Beginner	Start Challenge
103	Modify Elements in HashMap	Beginner	Start Challenge
104	Modifying an ArrayList with Java	Beginner	Start Challenge
105	Multiple Class Method Overriding	Beginner	Start Challenge
106	Multiple Classes Inheriting a Class	Beginner	Start Challenge
107	Multiply Array By Ten	Beginner	Start Challenge
108	Overload Final Method Demonstration	Beginner	Start Challenge
109	Overriding Parent Class Method	Beginner	Start Challenge
110	Palindrome Number Check	Beginner	Start Challenge
111	Perform Complex Number Addition	Beginner	Start Challenge
112	Pound to Kilogram Conversion Program	Beginner	Start Challenge
113	Primitive Types to Wrapper Classes	Beginner	Start Challenge
114	Print Any Type of Data	Beginner	Start Challenge
115	Print Even Numbers from Array	Beginner	Start Challenge
116	Print Non-Alphabet Characters	Beginner	Start Challenge
117	Print Value of Any Data Type	Beginner	Start Challenge
118	Printing Array Elements	Beginner	Start Challenge
119	Printing Individual Characters in a String	Beginner	Start Challenge
120	Printing a Sentence Three Times	Beginner	Start Challenge
121	Removing Elements from a HashMap	Beginner	Start Challenge
122	Reverse a Number Program	Beginner	Start Challenge
123	Shop Profit/Loss Calculator	Beginner	Start Challenge
124	Simple Interest Calculation Program	Beginner	Start Challenge
125	String Concatenation: Two Texts Combined	Beginner	Start Challenge
126	String Conversion: First Letter Uppercase	Beginner	Start Challenge
127	Subtraction of Coordinates	Beginner	Start Challenge
128	Swapping Two Numbers with Temp	Beginner	Start Challenge
129	Valid Internal Angles of Triangle	Beginner	Start Challenge
130	Validate Leap Year Condition	Beginner	Start Challenge
131	Verify Prime Number Status Using Java	Beginner	Start Challenge
132	Verifying Class Instance	Beginner	Start Challenge
133	Voting Eligibility Determination Program	Beginner	Start Challenge
134	Airplane Battle Game	Intermediate	Start Challenge
135	Alien Cell Fission	Intermediate	Start Challenge
136	Area of Circle with Any Radius	Intermediate	Start Challenge
137	Automotive Sales Market	Intermediate	Start Challenge
138	Bank Account Program	Intermediate	Start Challenge
139	Blossoms Compete for Beauty	Beginner	Start Challenge
140	Building and Deploying Spring Boot	Intermediate	Start Challenge
141	Business Card Distribution	Intermediate	Start Challenge
142	Caesar Cipher Encryption	Intermediate	Start Challenge
143	Calculating the Volume of a Cube	Intermediate	Start Challenge
144	Calculating the Volume of a Cylinder	Intermediate	Start Challenge
145	Chat Room Simulation	Beginner	Start Challenge
146	Class Grade Ranking	Beginner	Start Challenge
147	Class Properties and Methods	Intermediate	Start Challenge
148	Classify Words by Parts of Speech	Beginner	Start Challenge
149	Coexisting Chicken and Rabbit Cage	Intermediate	Start Challenge
150	Configuration File Content	Intermediate	Start Challenge
151	Configuring Class Parameters with Annotations	Beginner	Start Challenge
152	Counting the Occurrences of a Substring	Intermediate	Start Challenge
153	Define Your Annotations	Beginner	Start Challenge
154	Design and Implementation of Graphic Interface	Intermediate	Start Challenge
155	Design and Implementation of Multiple Interfaces	Beginner	Start Challenge
156	Determine Spaceship Return Feasibility	Intermediate	Start Challenge
157	Determine Triangle Feasibility with Exception Hand...	Beginner	Start Challenge
158	Dining Philosophers Synchronization	Intermediate	Start Challenge
159	Displaying Data Information Using Iterator	Intermediate	Start Challenge
160	Divide Apples with Exception Handling	Intermediate	Start Challenge
161	Efficient Student Grade Analysis Program	Beginner	Start Challenge
162	Enter student information	Intermediate	Start Challenge
163	Enum Class for Gender Information	Beginner	Start Challenge
164	Fibonacci Sequence Programming	Intermediate	Start Challenge
165	File Content Filtering	Beginner	Start Challenge
166	File Upload Based on UDP Protocol	Beginner	Start Challenge
167	Flow Control Statements for Multiple Requirements	Intermediate	Start Challenge
168	Fun Code Completion	Beginner	Start Challenge
169	Get Information from Google Homepage	Intermediate	Start Challenge
170	Handling Incorrect Grades	Beginner	Start Challenge
171	Hello LabEx Using Java	Beginner	Start Challenge
172	How Many Days in Each Month	Intermediate	Start Challenge
173	Implement Countdown Timer Thread	Beginner	Start Challenge
174	Implement a Stock class	Intermediate	Start Challenge
175	Implementing Pascal's Triangle	Intermediate	Start Challenge
176	Implementing String Split	Intermediate	Start Challenge
177	Implementing String Utility Class	Beginner	Start Challenge
178	Intelligent Care Call Service	Intermediate	Start Challenge
179	Intersection of Linked Lists	Intermediate	Start Challenge
180	Java Engineer Salary Calculation	Beginner	Start Challenge
181	Kong Rong's Generosity	Intermediate	Start Challenge
182	Landlord Card Game Simulation Using Java	Intermediate	Start Challenge
183	Launching Wayne's Automated Height Calculation	Intermediate	Start Challenge
184	Log Information Classification	Beginner	Start Challenge
185	Love at First Sight	Beginner	Start Challenge
186	Maximize Aeroplane Chess Score Using Dynamic Progr...	Intermediate	Start Challenge
187	Maximize Airplane Destruction Strategy	Intermediate	Start Challenge
188	Maximum value of three numbers.	Intermediate	Start Challenge
189	Modify Weapon Design Using Inheritance	Intermediate	Start Challenge
190	Narcissistic Number Judgment	Intermediate	Start Challenge
191	Navigating Space Bridge with Java Arrays	Intermediate	Start Challenge
192	No Money Jewelry Store Marketing	Intermediate	Start Challenge
193	Number of Palindromic Numbers	Intermediate	Start Challenge
194	Nüwa Creates Humans	Intermediate	Start Challenge
195	Obtaining Class Objects of Different Classes	Intermediate	Start Challenge
196	Operations with Method References	Intermediate	Start Challenge
197	Optimal Coin Selection for Spring Purchase	Intermediate	Start Challenge
198	Optimizing Threaded Relay Race Simulation	Beginner	Start Challenge
199	Output a Triangle	Beginner	Start Challenge
200	Outputting Book Info	Intermediate	Start Challenge
201	Parsing XML Data Information with DOM	Beginner	Start Challenge
202	Point Inside a Triangle	Intermediate	Start Challenge
203	Producer-Consumer Queue Implementation	Intermediate	Start Challenge
204	Reflectively Create A Person Object	Beginner	Start Challenge
205	Release Scanner Resource using finally	Beginner	Start Challenge
206	Rescue Princess with Conditional Execution	Intermediate	Start Challenge
207	Reverse One-Dimensional Array in Java	Intermediate	Start Challenge
208	Reverse Output Word List	Beginner	Start Challenge
209	Reverse Word Order in English Sentences	Intermediate	Start Challenge
210	Rewriting the equals method	Intermediate	Start Challenge
211	Running Data Alternately In Three Groups	Beginner	Start Challenge
212	SAX Parsing XML Data	Beginner	Start Challenge
213	Searching in a Two-Dimensional Array	Intermediate	Start Challenge
214	Servlet User Information Query	Intermediate	Start Challenge
215	Simple Student Management System	Intermediate	Start Challenge
216	Simulated University Management System	Intermediate	Start Challenge
217	Spaceship Speed Control	Intermediate	Start Challenge
218	Spare Me, My Lord	Intermediate	Start Challenge
219	Spiral Traversal of a Tree	Intermediate	Start Challenge
220	Stair Climbing and Balance Prediction	Beginner	Start Challenge
221	Storing Data Information Using TreeSet	Intermediate	Start Challenge
222	Strength Training with Accumulative Method	Intermediate	Start Challenge
223	String Class Constructors	Beginner	Start Challenge
224	String Information Statistics	Intermediate	Start Challenge
225	String class methods	Beginner	Start Challenge
226	Student Management System	Intermediate	Start Challenge
227	Student Score Ranking System	Intermediate	Start Challenge
228	Substring Occurrence Count	Intermediate	Start Challenge
229	Summoning Elves Gameplay	Intermediate	Start Challenge
230	The Magical Pocket	Intermediate	Start Challenge
231	The Wall Has Ears	Intermediate	Start Challenge
232	The Wandering Earth	Intermediate	Start Challenge
233	The Wish of Five Cents	Intermediate	Start Challenge
234	Understanding Constant Pool	Beginner	Start Challenge
235	User Registration Validation with Exceptions	Intermediate	Start Challenge
236	Using Inheritance to Save Code	Beginner	Start Challenge
237	When Can I Save Enough Money	Beginner	Start Challenge
238	Writing Objects to File	Beginner	Start Challenge
239	Yin and Yang	Beginner	Start Challenge

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