Get Started →

Java Tutorial

🔍

Java Roadmap Java Introduction What is Java?History & Features JDK vs JRE vs JVM How Java Works Install Java & Setup First Java Program Java vs Other Languages

Syntax & Structure Java Keywords & Reserved Words Naming Conventions Data Types Variables Type Casting Operators Increment & Decrement Operators Escape Sequences Math Class User Input (Scanner)Wrapper Classes Autoboxing & Unboxing final Keyword Comments

if Statement if-else Statement else-if Ladder Nested if Statements switch Statement for Loop for-each Loop while Loop do-while Loop break Statement continue Statement Nested Loops

Arrays Basics Multi-dimensional Arrays Array Methods (Arrays class)Passing Arrays to Methods Practice Questions

String Basics String Methods String Comparison equals() vs ==String Pool Immutable Strings StringBuilder String Formatting Practice Questions

Defining Methods Parameters & Return Types Method Overloading Recursion Variable Arguments (varargs)Pass by Value vs Pass by Reference Practice Questions

Classes & Objects Constructors this Keyword static Keyword Encapsulation Inheritance super Keyword Polymorphism Method Overriding Method Overloading vs Overriding Abstraction Abstract Classes Interfaces Abstract Class vs Interface Object Class & toString()

Packages in Java Creating Custom Packages import Statement Access Modifiers Overview public Modifier private Modifier protected Modifier default (package-private)

Inner Classes Anonymous Classes Enums Records (Java 16+)Sealed Classes (Java 17+)Annotations Built-in Annotations Custom Annotations Reflection API Design Patterns Overview

Collections Overview ArrayList LinkedList Stack Queue HashSet & LinkedHashSet TreeSet HashMap & LinkedHashMap TreeMap PriorityQueue Deque & ArrayDeque Iterator ListIterator Comparable Comparator Comparable vs Comparator Collections Utility Class Choosing the Right Collection Practice Questions

Generics Basics Generic Methods Generic Classes Bounded Type Parameters Wildcards Type Erasure

Java 8 Key Features Java 11 Features Java 17 Features (LTS)Java 21 Features (LTS)var (Local Type Inference)Text Blocks Pattern Matching Switch Expressions Virtual Threads (Java 21)

Exception Hierarchy try-catch finally Block try-with-resources throw Keyword throws Keyword Difference Between throw and throws Checked vs Unchecked Custom Exceptions Multi-catch Exception Propagation Practice Questions

File & Path Basics Reading Files Writing Files BufferedReader & Writer NIO.2 (java.nio)Serialization Externalization Serialization vs Externalization

Threads Basics Runnable & Callable Thread Lifecycle Synchronization volatile Keyword Race Conditions Deadlock wait, notify & notifyAll Executor Framework CompletableFuture Practice Questions

JVM Architecture Stack Memory Heap Memory Stack vs Heap Memory Garbage Collection ClassLoader JIT Compiler

Top Java Interview Q&A Core Java Interview Questions OOP Interview Questions String Interview Questions Array Interview Questions Collections Interview Q&A Multithreading Q&A Exception Handling Q&A Java 8+ Interview Q&A FAANG Java Questions Coding Challenges

Clean Code in Java SOLID Principles Effective Java Tips Common Anti-Patterns Code Review Checklist

Beginner Mistakes OOP Mistakes Collections Mistakes Streams Mistakes Exception Handling Mistakes Concurrency Mistakes Performance Pitfalls Memory Leaks

Exception Handling Mistakes

Content not found for this topic.

PreviousStreams Mistakes

NextConcurrency Mistakes

exceptions | Java Tutorial | DevStackFlow