Data Types in Java

Study Notes

Byte, Short, Int, and Long represent signed integers (positive and negative values).
Java doesn't directly support unsigned integers.
Byte: Used for small integers, range -128 to 127. Declared using byte keyword.
Short: Used for integers within the range -32768 to 32767. Declared using short keyword.
Int: Preferred for general integer use, as Byte and Short values are automatically promoted to Int in expressions. Declared using int keyword.
Long: Used for very large integers. Needs an L after the value when initializing. Declared using long keyword.

Used for computations that require fractional accuracy, such as square root, sine, and cosine.
Float: Single-precision floating point, uses less memory but is slower on some processors.
Double: Double-precision floating point, faster on modern processors optimized for mathematical calculations.

Two main categories: ASCII and Unicode.
ASCII: Represented by Byte data type. A single character is enclosed in single quotes when assigning or initializing it.
Unicode: Supports a wider range of characters, including non-English characters and characters used in languages outside of the US. Implemented through Char data type.

Hexadecimal initialization: Decimal integer 3001 can be represented as 0x4A8 in hexadecimal.
Float initialization: float pi = 3.14f;
Double initialization: double pi = 3.141590; (The d suffix is optional)
Character initialization: byte Gender = 'F';