Core
Java

Build a strong base in Java syntax and logic:

• Data types, variables, and keywords
• Operators and expressions in Java
• Primitive data types and string handling
• Type casting (widening & narrowing conversions)
• Conditional statements (if-else, switch case)
• Loops (for, while)
• Writing basic Java programs

🔑 Keywords: Java syntax, variables in Java, control statements

Understand how to structure and reuse code efficiently:

• Methods and classes overview
• Method declaration, parameters, and return types
• Static methods and static keyword
• Packages and static imports
• Industry-level coding standards

🔑 Keywords: Java methods, static keyword, Java functions

Work with data structures and string operations:

• Arrays and their properties
• String methods and operations
• Mutable vs immutable strings
• StringBuffer and StringBuilder
• Command-line arguments (args[])
• Practical programs on arrays and strings

🔑 Keywords: Java arrays, string handling in Java

Master the core of Java development:

• OOP concepts and real-world applications
• Classes, objects, and constructors
• “this” and “super” keywords
• Heap memory and garbage collection
• Static keyword in OOP

🔑 Keywords: OOP in Java, classes and objects

• Access modifiers (public, private, protected)
• Getter and setter methods
• Final keyword usage

• Types of inheritance (single, multilevel, hierarchical)
• Super keyword and method overriding basics
• Object class methods
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• Method overloading and overriding
• Compile-time vs runtime polymorphism
• Overriding toString() and equals()
• @Override annotation
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• Abstract classes and methods
• Interfaces and their usage
• Functional interfaces
• Lambda expressions and inner classes

Learn to handle errors effectively:

• Exception hierarchy
• Try, catch, finally blocks
• Try-with-resources
• Throw and throws keywords
• Custom exception handling
• Best practices

🔑 Keywords: Java exception handling, try catch

Work with dynamic data structures:

• Collection interface hierarchy
• ArrayList, LinkedList, Set
• Iterators and traversal
• Comparator and Comparable
• Map interface and HashMap
• Fail-fast and fail-safe collections

🔑 Keywords: Java collections, ArrayList, HashMap

• File operations in Java
• InputStream and OutputStream
• Reading and writing files
• Serialization and deserialization
• Best practices

Learn advanced Java concepts:

• Thread creation (Thread class & Runnable)
• Thread lifecycle and states
• Thread pools and synchronization
• Deadlocks and concurrency issues
• Volatile keyword and AtomicInteger

🔑 Keywords: Java multithreading, concurrency in Java