Java Data Types Full Tutorial | Primitive vs Reference Types, Memory Concepts, Autoboxing & Literals
🎯 Hook
Choosing the wrong data type is one of the most common sources of silent bugs — an int that overflows, a float that loses precision, a comparison that always fails. This video covers every Java data type in depth, including how they behave in memory and exactly when to reach for wrapper classes.
📌 Topics Covered
• What are variables? — declaration, initialization, and naming rules
• Two categories: Primitive types vs Reference types — key differences
• Integer group: byte (1B), short (2B), int (4B), long (8B) — size, range, when to use each
• Floating-point group: float vs double — precision pitfalls and IEEE 754 basics
• char — UTF-16 encoding, size, and character literals
• boolean — true/false, size in JVM, and common mistakes
• Default values for instance variables (vs local variables which have none)
• Wrapper Classes: Integer, Double, Character, Boolean and why they exist
• Autoboxing (primitive → wrapper) and Unboxing (wrapper → primitive) with performance implications
• Literals — integer (decimal, hex, binary, octal), floating-point, char, String, boolean
• Type casting: widening (automatic) vs narrowing (explicit) conversion
• Overflow and underflow — what happens and how to detect it
🗒️ What Makes This Video Different
Every data type is presented with its size, memory range, a runnable code example, and a real-world use case so you know when to choose it.
⏱️ Timestamps
00:00:00 Data Types and Variables Overview
00:01:15 Primitive Data Types
00:03:10 Wrapper Classes
00:04:54 Literals
00:06:48 Type Casting
00:08:45 Variables
00:10:56 Default Values
00:12:35 Final Keyword
00:14:00 Final Keyword Code
00:16:10 Thank You
👥 Who Is This Video For?
• Beginners learning Java for the first time
• Students covering Core Java for university exams
• Developers preparing for Java coding interviews
• Anyone who wants to avoid type-related bugs and silent data loss
🏷️ Hashtags
#Java #DataTypes #Variables #WrapperClasses #Autoboxing #TypeCasting #JavaBeginners #LearnJava #JavaTutorial #CoreJava
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