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L1.2 — Variables and Methods covers Java variables and methods, the fundamental differences between primitives and objects, variable naming conventions, scope rules, and method definition/overloading.

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📋 At a Glance

• [ ] Review Java variable naming conventions (case sensitivity, allowed characters)
• [ ] Understand the difference between primitives and objects
• [ ] Practice declaring and initializing variables with proper data types
• [ ] Learn the 8 primitive types and their default values
• [ ] Master object references vs primitive values
• [ ] Understand member variables vs local variables (scope)
• [ ] Practice method definition syntax with all required components
• [ ] Understand pass-by-value (primitives) vs pass-by-reference (objects)
• [ ] Learn method overloading rules and signatures
• [ ] Practice using System.out.println() and string concatenation

1. Java Variable Naming Rules

Java follows strict naming conventions that are case sensitive:

✅ Allowed:

• Letters, underscore (_), and dollar sign ($)
• Can contain numbers (but not as first character)
• Should start with lowercase for variables and methods