Q 21 - Data Types

[AmjustGettingStarted]

What are the different data types in Java? 🤔

[HARSHITH-MV]

📊 Java Data Types

Java data types are divided into two main categories:

1️⃣ Primitive Data Types

These are the most basic types built into the language.

Type	Size	Description	Example
byte	1 byte	Smallest integer type	byte b = 10;
short	2 bytes	Small integer	short s = 100;
int	4 bytes	Default integer type	int i = 1000;
long	8 bytes	Large integer	long l = 10000L;
float	4 bytes	Decimal numbers (single precision)	float f = 10.5f;
double	8 bytes	Decimal numbers (double precision)	double d = 20.99;
char	2 bytes	Single character	char c = 'A';
boolean	1 bit	True or false	boolean b = true;

2️⃣ Non-Primitive (Reference) Data Types

These refer to objects and arrays.

Type	Description	Example
String	Sequence of characters	String s = "Hello";
Array	Collection of similar data types	int[] arr = {1,2,3};
Class	Blueprint for objects	Car myCar = new Car();
Interface	Abstract type for behavior specification	Runnable r = new Task();

🧠 Quick Tips

• Use int for whole numbers unless size is a concern.
• Use double for decimals unless memory is tight.
• String is not a primitive, but it's used like one due to its popularity.
• Always choose the smallest data type that fits your need for efficiency.