Fields and Instance Variables in Java
Discover how instance variables store object state, get default values, and participate in encapsulation.
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For Loops in Java
Master Java for loops: traditional for loops, enhanced for-each syntax, when to use each variant, and common iteration patterns with performance considerations.
Generic Classes in Java
Learn how to write reusable, type-safe data structures using type parameters like T, K, V in Java generic classes.
Generic Methods in Java
Master generic method declarations in Java including type inference, bounded parameters, and varargs with generics.
HashMap in Java
Understand HashMap: key-value storage with O(1) average lookups, hash collisions, rehashing, and performance characteristics.
HashSet in Java
Learn HashSet: unique element collections backed by HashMap, contains and add operations, and the internal ELEMENT object pattern.
If-Else Statements in Java
Learn Java if-else branching logic: conditional statements, else-if chains, nested conditionals, and operator precedence considerations for decision making.
Inheritance in Java
Master Java inheritance: extends keyword, super, method overriding, and the substitutability principle.
Interfaces in Java
Master pure contracts: default methods, static methods, functional interfaces, and how interfaces define behavior in Java.
java.io and java.nio.file
Read, write, and navigate files with java.io and java.nio.file: Path, Files, BufferedReader, BufferedWriter, and directory walking.