Java Variables and Data Types Explained Simply!
"🚀 Java Basics Made Easy! In this video, we’ll break down variables and data types in Java for beginners. Learn how to declare variables, understand primitive vs non-primitive data types, and explore their real-world usage with simple examples. Whether you're a coding newbie or brushing up your skills, this video will help you master the fundamentals of Java programming in no time! 💻
Keywords
Java Keywords
In Java, keywords are reserved words that have predefined meanings in the language. They cannot be used as variable names, class names, or method names. Java has 50 keywords (as of Java SE 8), which are essential for writing programs.
List of Java Keywords
Category Keywords
Data Types byte, short, int, long, float, double, char, boolean
Control Flow if, else, switch, case, default, for, while, do, break, continue
Access Control public, private, protected
Class and Object class, interface, extends, implements, new, this, super
Exception Handling try, catch, finally, throw, throws
Modifiers abstract, final, static, synchronized, native, transient, volatile
Method Control void, return
Package Management package, import
Object Reference null, super, this
Logical and Flow true, false, instanceof
Multithreading synchronized
Others const (reserved, not used), goto (reserved, not used), assert, enum
Type Size Example Description
byte 1 byte byte b = 10; Stores whole numbers (-128 to 127).
short 2 bytes short s = 100; Stores whole numbers (-32,768 to 32,767).
int 4 bytes int i = 1000; Stores whole numbers.
long 8 bytes long l = 10000L; Stores large whole numbers.
float 4 bytes float f = 10.5f; Stores fractional numbers.
double 8 bytes double d = 10.55; Stores large fractional numbers.
char 2 bytes char c = 'A'; Stores a single character.
boolean 1 bit boolean b = true; Stores true or false.
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