There are two Data-types in java:

• Primitive data type

• Non-primitive data type.

Primitive data type:

There are six primitive data types:

these data type is inbuilt space in that data type like 1 byte and 2 byte.

• Byte = memory capacity is 1 byte it store the numbers like 123
• short = memory capacity is 2 byte it store the number only
• int = memory capacity is 4 byte it store the number only
• long = memory capacity is 8 byte it store the number only
• float = memory capacity is 4 bytes it store the decimal numbers like 3.45
• Double = memory capacity is 8 byte it store the decimal numbers
• char = memory capacity is 2 byte it story only one charactor like 'A'

Non-primitive data types:

• They are not built-in basic types like int, char, float.

• They are made from classes.

• They can store multiple values and have methods.

• Also called reference types because they store a reference (memory address).

These are the data types:

• String Stores text (many characters) "Seenu", "Java is fun"
• Array Stores a group of value {10, 20, 30}
• Class Blueprint for creating custom objects new Student();
• Object Parent of all classes Object obj = new Object();
• InterfaceCollection of abstract methods interface Animal {}