Java

Last Updated: October 2, 2025
By: javahandson
Series

The Java section covers the core concepts, APIs, and programming techniques every Java developer should know. You’ll find tutorials on Java basics, object-oriented programming, arrays, strings, exception handling, collections, multithreading, input/output, and modern Java features. The content is designed for beginners as well as experienced developers who want to strengthen their fundamentals. Practical examples are used wherever possible to make concepts easier to understand. This section also provides a strong foundation for learning Spring, Spring Boot, system design, and interview topics.

Java

Collections Utility Class in Java: sort, binarySearch, and unmodifiable
Sorting Collections in Java: Collections.sort & Custom Orders
Comparable vs Comparator in Java: Sorting Objects the Right Way
ConcurrentModificationException in Java: Causes and Fixes
Iterator and ListIterator in Java: Fail-Fast vs Fail-Safe
Type Casting in Java
Nested and Inner Classes in Java: A Complete Beginner’s Guide
Enum in Java: A Complete Beginner’s Guide with Examples
BlockingQueue in Java: Producer-Consumer Pattern
Object Class in Java: toString, equals, hashCode, getClass, and clone
Stack in Java: Why ArrayDeque Replaced It
Packages in Java
Interface in Java Explained with Examples
Abstract Class in Java: When and Why to Use It (Examples)
Inheritance vs Composition in Java: A Practical Guide
Understanding Inheritance in Java: Syntax, Types, and the Diamond Problem
Encapsulation in Java: A Beginner-Friendly Guide with Examples
Polymorphism in Java
CopyOnWriteArrayList and CopyOnWriteArraySet in Java
ArrayDeque in Java: The Better Stack and Queue
Abstraction in Java
PriorityQueue in Java: Heap Internals & Comparators
Arrays in Java
Three-dimensional array in Java
final Keyword in Java: Variables, Methods, and Classes (A Beginner’s Guide)
Jagged array in Java
ConcurrentHashMap Internals Explained: Bins, Locks, and Lock-Free Reads
Queue and Deque in Java: Interfaces and Core Methods (A Beginner’s Guide)
static Keyword in Java: Variables, Methods, Blocks and Nested Classes Explained
EnumMap and IdentityHashMap in Java: Two Special Maps Worth Knowing
var in Java: Local Variable Type Inference (A Beginner’s Guide)
this and super Keywords in Java: A Complete Beginner Guide
Wrapper Classes and Autoboxing in Java: A Beginner’s Guide
HashMap vs Hashtable vs ConcurrentHashMap in Java: A Beginner’s Guide
Atomic Variables in Java: AtomicInteger, AtomicLong and CAS Explained
Advanced Java method concepts
Methods in Java
Type Conversion and Casting in Java (Primitives): A Beginner’s Guide
TreeMap in Java Explained: Sorting, NavigableMap & SortedMap
Semaphore in Java Explained: Permits, acquire() and release()
Constructors in Java
Variables and Constants in Java
CyclicBarrier in Java with Examples: The Reusable Rendezvous Point
LinkedHashMap in Java: Access Order & Building an LRU Cache
Class Types in Java
Data types in Java with examples
ReentrantLock in Java: The Explicit-Lock Alternative to synchronized
ReadWriteLock in Java Explained
HashMap vs LinkedHashMap vs TreeMap in Java (A Beginner’s Guide)
ScheduledExecutorService in Java: Run Tasks Later or on a Repeating Schedule
HashMap in Java: Map Interface, Buckets & Hashing Explained
Types of data members
CountDownLatch in Java with Examples
ThreadPoolExecutor in Java: How Thread Pools Really Work
TreeSet in Java: Sorting, Comparators & NavigableSet Guide
Callable and Future in Java: Results, Exceptions & Timeouts
Class Members in Java
Ternary Operator in Java
break and continue statement in Java
HashSet vs LinkedHashSet: Ordering Without Sacrificing Speed
ExecutorService in Java
Literals in Java: Types, Rules, and the Traps Nobody Warns You About
Exception Rules in Java
Introduction to java.util.concurrent Package in Java: A Beginner’s Map
StringBuilder in Java
HashSet in Java: How Sets Work (Beginner’s Guide)
do while and while Loop in Java: Syntax, Examples, and Differences
Keywords and Identifiers in Java: A Simple Beginner’s Guide
Custom and Chained exceptions in Java
Race Conditions and Thread Safety in Java
Bitwise Operators in Java
List Interface in Java: ArrayList vs LinkedList vs Vector
LinkedList in Java Explained: ArrayList vs LinkedList (Internals)
StringBuffer in Java
Access specifiers in Java
Deadlock in Java: Causes and How to Avoid It
JDK 11 installation on Windows
The volatile Keyword in Java: The Visibility Guarantee and Its Limits
Throwing Exceptions in Java
String comparison in Java
wait and notify in Java: How Threads Coordinate (Inter-Thread Communication)
Classes and Objects in Java
Unary Operators in Java
Thread Synchronization in Java: synchronized Keyword Explained
for loop and nested for loop in Java
Structure of a Java program
try, catch and finally, blocks
ArrayList in Java: List Interface Core Concepts & Internals (Beginner’s Guide)
Creating Threads in Java: Thread Class vs Runnable Interface
String immutability in Java
Thread Priority in Java and Daemon Threads: A Beginner-Friendly Guide
Thread Methods in Java: start, run, sleep, join, and more
Thread Life Cycle in Java: States and Transitions Explained
Introduction to Exception Handling in Java
String in Java
Introduction to Collections Framework in Java
Java basics for beginners
Multithreading in Java: Threads and Concurrency Explained
Principles of Object-oriented Programming
Conditional Statements in Java: if, else-if, Nested if, switch and Ternary
Operators in Java
Input and Output in Java

Java

Last Updated: October 2, 2025

By: javahandson

Series

Java

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JavaHandsOn is a learning website. Here I will share knowledge related to Java and its frameworks like Spring, Hibernate, Spring Boot, etc. We will learn every topic using some basic examples. I hope you get in-depth knowledge of Java here and be a proficient developer.