☕ Java

The language behind many campus placement tests and enterprise systems, from first program to collections.

1. Getting started with Java
Install the JDK, write a class and run it.
2. Variables and data types
Primitive types, String, and casting.
3. Strings
Useful methods, comparing with equals, and StringBuilder.
4. Conditions and loops
if, switch, for, while and the enhanced for loop.
5. Arrays
Fixed-size lists of one type, plus sorting and 2D arrays.
6. Methods
Parameters, return types, overloading and how arguments are passed.
7. Classes and objects
Fields, constructors, encapsulation and static members.
8. Inheritance and interfaces
extends, implements, overriding and polymorphism.
9. Exceptions
try, catch and finally, and checked versus unchecked exceptions.
10. Collections
ArrayList, HashMap and HashSet: the classes you will use most.
11. Java quick reference
Keywords and everyday methods on one page.

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