sorabh86 / corejava

Core JAVA

Index

• Common Java
• Java Basic Notes
• Basic Programs
• Algorithms & Data Structure
• Algorithm Programs
• Design Patterns
• Build Tools
• Multi-Threading & Concurrency

This project contains many java most asked interview question with example

Data Types

Primitives

A primitive type always have a value.

Table to Understand Algorithms & Bits used by a datatype

Data Type	Default	Size	Range	Algorithm
boolean	false	1 bit	true or false	simple flags
char	'\u0000'	2 byte	'\u0000' (or 0) to '\uffff' (or 65,535 inclusive)	single 16-bit Unicode character
byte	0	1 byte	-128 to 127 (inclusive)	8-bit signed two's complement integer
short	0	2 byte	-32,768 to 32,767 (inclusive)	16-bit signed two's complement integer
int	0	4 byte	-2,147,483,648 (-2^31) to 2,147,483,647 (2^31 -1) (inclusive)	32-bit signed two's complement integer
long	0L	8 byte	-9,223,372,036,854,775,808(-2^63) to 9,223,372,036,854,775,807(2^63 -1)(inclusive)	64-bit two's complement integer
float	0.0f	4 byte	unlimited	single-precision 32-bit IEEE 754 floating point
double	0.0d	8 byte	unlimited	double-precision 64-bit IEEE 754 floating point

Non-Primitive (Reference Type)

A non-primitive type can be null.

1. Strings
2. Arrays
3. Classes
4. Interface
5. Enum

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