Java

Introduction to Java

Classes, the main method, and compiling to the JVM.

Variables, Types & Operators

Primitive and reference types, final constants, var, type casting, and arithmetic, comparison, and logical operators.

Strings & Math

String methods, concatenation, special characters, StringBuilder, and the Math class.

Control Flow

Booleans, if/else, the ternary operator, switch, while, do/while, for, for-each, break, and continue.

Arrays

Creating arrays, indexes and length, looping through arrays, the Arrays class, and 2-D arrays.

Methods

Defining methods, parameters and return values, overloading, scope, and recursion.

Classes & Objects

Classes and objects, attributes and methods, constructors, this, access modifiers, encapsulation, and packages.

Inheritance & Polymorphism

extends and super, overriding methods, polymorphism, abstract classes, and inner classes.

Interfaces, Anonymous Classes & Enums

Interfaces and implements, default methods, anonymous classes, and enums with fields and switch.

Exceptions & Debugging

Compile vs runtime errors, try/catch/finally, multiple catches, throwing and custom exceptions, try-with-resources, and debugging.

Files & I/O

Creating, writing, reading, and deleting files with File, FileWriter, Scanner, and BufferedReader/Writer.

Collections

List, ArrayList, and LinkedList; Set and HashSet; Map and HashMap; sorting; iterators; and wrapper classes.

Generics, Lambdas & Streams

Generic classes and methods, lambda expressions, method references, Comparators, and stream operations.