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.

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	Beginner	Start Challenge
006	🎯 Finding Minimum and Maximum Student Marks	Beginner	Start Challenge
007	🎯 Implement Deque Data Structure	Beginner	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	Beginner	Start Challenge
013	🎯 Concurrent Execution of Threads	Beginner	Start Challenge
014	🎯 Counting Character Occurrences	Beginner	Start Challenge
015	🎯 Custom Regular Expression	Beginner	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	Beginner	Start Challenge
019	🎯 From One-Fourth to 0	Beginner	Start Challenge
020	🎯 Implementing Queue Manually	Beginner	Start Challenge
021	🎯 Lambda Expressions For Data Operations	Beginner	Start Challenge
022	🎯 Matrix element information printing	Beginner	Start Challenge
023	🎯 Remove Duplicate Numbers	Beginner	Start Challenge
024	🎯 Set a price for attractions tickets	Beginner	Start Challenge
025	🎯 Sibling Money Division Game	Beginner	Start Challenge
026	🎯 Simulating a Library	Beginner	Start Challenge
027	🎯 Solving Apple Distribution Problem with Exceptions	Beginner	Start Challenge
028	🎯 Storing Data Information Using HashSet	Beginner	Start Challenge
029	🎯 Sum of Large Numbers	Beginner	Start Challenge
030	🎯 Sum of Three-Digit Number's Digits	Beginner	Start Challenge
031	🎯 The Only God	Beginner	Start Challenge
032	🎯 Usage of Stream	Beginner	Start Challenge
033	🎯 Validating ID Card Number	Beginner	Start Challenge
034	🎯 Simple Java Print Statement	Beginner	Start Challenge
035	🎯 Implement Encryption and Decryption	Beginner	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	Beginner	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	Beginner	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	Beginner	Start Challenge
091	🎯 Finding Prime Numbers in Intervals	Beginner	Start Challenge
092	🎯 Finding the GCD of Two Numbers	Beginner	Start Challenge
093	🎯 Finding the Lowest Common Multiple	Beginner	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	Beginner	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	Beginner	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	Beginner	Start Challenge
135	🎯 Alien Cell Fission	Beginner	Start Challenge
136	🎯 Area of Circle with Any Radius	Beginner	Start Challenge
137	🎯 Automotive Sales Market	Beginner	Start Challenge
138	🎯 Bank Account Program	Beginner	Start Challenge
139	🎯 Blossoms Compete for Beauty	Beginner	Start Challenge
140	🎯 Building and Deploying Spring Boot	Beginner	Start Challenge
141	🎯 Business Card Distribution	Beginner	Start Challenge
142	🎯 Caesar Cipher Encryption	Beginner	Start Challenge
143	🎯 Calculating the Volume of a Cube	Beginner	Start Challenge
144	🎯 Calculating the Volume of a Cylinder	Beginner	Start Challenge
145	🎯 Chat Room Simulation	Beginner	Start Challenge
146	🎯 Class Grade Ranking	Beginner	Start Challenge
147	🎯 Class Properties and Methods	Beginner	Start Challenge
148	🎯 Classify Words by Parts of Speech	Beginner	Start Challenge
149	🎯 Coexisting Chicken and Rabbit Cage	Beginner	Start Challenge
150	🎯 Configuration File Content	Beginner	Start Challenge
151	🎯 Configuring Class Parameters with Annotations	Beginner	Start Challenge
152	🎯 Counting the Occurrences of a Substring	Beginner	Start Challenge
153	🎯 Define Your Annotations	Beginner	Start Challenge
154	🎯 Design and Implementation of Graphic Interface	Beginner	Start Challenge
155	🎯 Design and Implementation of Multiple Interfaces	Beginner	Start Challenge
156	🎯 Determine Spaceship Return Feasibility	Beginner	Start Challenge
157	🎯 Determine Triangle Feasibility with Exception Hand...	Beginner	Start Challenge
158	🎯 Dining Philosophers Synchronization	Beginner	Start Challenge
159	🎯 Displaying Data Information Using Iterator	Beginner	Start Challenge
160	🎯 Divide Apples with Exception Handling	Beginner	Start Challenge
161	🎯 Efficient Student Grade Analysis Program	Beginner	Start Challenge
162	🎯 Enter student information	Beginner	Start Challenge
163	🎯 Enum Class for Gender Information	Beginner	Start Challenge
164	🎯 Fibonacci Sequence Programming	Beginner	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	Beginner	Start Challenge
168	🎯 Fun Code Completion	Beginner	Start Challenge
169	🎯 Get Information from Google Homepage	Beginner	Start Challenge
170	🎯 Handling Incorrect Grades	Beginner	Start Challenge
171	🎯 Hello LabEx Using Java	Beginner	Start Challenge
172	🎯 How Many Days in Each Month	Beginner	Start Challenge
173	🎯 Implement Countdown Timer Thread	Beginner	Start Challenge
174	🎯 Implement a Stock class	Beginner	Start Challenge
175	🎯 Implementing Pascal's Triangle	Beginner	Start Challenge
176	🎯 Implementing String Split	Beginner	Start Challenge
177	🎯 Implementing String Utility Class	Beginner	Start Challenge
178	🎯 Intelligent Care Call Service	Beginner	Start Challenge
179	🎯 Intersection of Linked Lists	Beginner	Start Challenge
180	🎯 Java Engineer Salary Calculation	Beginner	Start Challenge
181	🎯 Kong Rong's Generosity	Beginner	Start Challenge
182	🎯 Landlord Card Game Simulation Using Java	Beginner	Start Challenge
183	🎯 Launching Wayne's Automated Height Calculation	Beginner	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...	Beginner	Start Challenge
187	🎯 Maximize Airplane Destruction Strategy	Beginner	Start Challenge
188	🎯 Maximum value of three numbers.	Beginner	Start Challenge
189	🎯 Modify Weapon Design Using Inheritance	Beginner	Start Challenge
190	🎯 Narcissistic Number Judgment	Beginner	Start Challenge
191	🎯 Navigating Space Bridge with Java Arrays	Beginner	Start Challenge
192	🎯 No Money Jewelry Store Marketing	Beginner	Start Challenge
193	🎯 Number of Palindromic Numbers	Beginner	Start Challenge
194	🎯 Nüwa Creates Humans	Beginner	Start Challenge
195	🎯 Obtaining Class Objects of Different Classes	Beginner	Start Challenge
196	🎯 Operations with Method References	Beginner	Start Challenge
197	🎯 Optimal Coin Selection for Spring Purchase	Beginner	Start Challenge
198	🎯 Optimizing Threaded Relay Race Simulation	Beginner	Start Challenge
199	🎯 Output a Triangle	Beginner	Start Challenge
200	🎯 Outputting Book Info	Beginner	Start Challenge
201	🎯 Parsing XML Data Information with DOM	Beginner	Start Challenge
202	🎯 Point Inside a Triangle	Beginner	Start Challenge
203	🎯 Producer-Consumer Queue Implementation	Beginner	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	Beginner	Start Challenge
207	🎯 Reverse One-Dimensional Array in Java	Beginner	Start Challenge
208	🎯 Reverse Output Word List	Beginner	Start Challenge
209	🎯 Reverse Word Order in English Sentences	Beginner	Start Challenge
210	🎯 Rewriting the equals method	Beginner	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	Beginner	Start Challenge
214	🎯 Servlet User Information Query	Beginner	Start Challenge
215	🎯 Simple Student Management System	Beginner	Start Challenge
216	🎯 Simulated University Management System	Beginner	Start Challenge
217	🎯 Spaceship Speed Control	Beginner	Start Challenge
218	🎯 Spare Me, My Lord	Beginner	Start Challenge
219	🎯 Spiral Traversal of a Tree	Beginner	Start Challenge
220	🎯 Stair Climbing and Balance Prediction	Beginner	Start Challenge
221	🎯 Storing Data Information Using TreeSet	Beginner	Start Challenge
222	🎯 Strength Training with Accumulative Method	Beginner	Start Challenge
223	🎯 String Class Constructors	Beginner	Start Challenge
224	🎯 String Information Statistics	Beginner	Start Challenge
225	🎯 String class methods	Beginner	Start Challenge
226	🎯 Student Management System	Beginner	Start Challenge
227	🎯 Student Score Ranking System	Beginner	Start Challenge
228	🎯 Substring Occurrence Count	Beginner	Start Challenge
229	🎯 Summoning Elves Gameplay	Beginner	Start Challenge
230	🎯 The Magical Pocket	Beginner	Start Challenge
231	🎯 The Wall Has Ears	Beginner	Start Challenge
232	🎯 The Wandering Earth	Beginner	Start Challenge
233	🎯 The Wish of Five Cents	Beginner	Start Challenge
234	🎯 Understanding Constant Pool	Beginner	Start Challenge
235	🎯 User Registration Validation with Exceptions	Beginner	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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LabEx is an interactive, hands-on learning platform dedicated to coding and technology. It combines labs, AI assistance, and virtual machines to provide a no-video, practical learning experience. With a strict 'Learn by Doing' approach, interactive online environments in the browser with automated step-by-step checks, structured content organization through the Skill Tree learning system, and a growing resource of 30 Skill Trees and over 6,000 Labs, LabEx offers comprehensive practical education. The platform includes Labby, an AI learning assistant built on latest AI models, providing a conversational learning experience.

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