Java is a statically-typed programming language. It means, all variables must be declared before its use. That is why we need to declare variable's type and name.
Data types specify the different sizes and values that can be stored in the variable. There are two types of data types in Java:
[1] Primitive data types:
In Java language, primitive data types are the building blocks of data manipulation. These are the most basic data types available in Java language. There are 8 types of primitive data types:
1) boolean
2) byte
3) char
4) short
5) int
6) long
7) float
8) double
[2] Non-primitive data types:
Non-primitive data types are created by programmers. They are not predefined in java like primitive data types. These data types are used to store a group of values or several values. The variable of a non-primitive data type is also called referenced data type in Java or simply object reference variable.
There are five types of non-primitive data types in Java:
1) Class
2) Object
3) String
4) Array
5) Interface
Difference :
1. Primitive data types are predefined in Java whereas non-primitive data types are created by programmers. They are not predefined in Java.
2. In primitive data type, variables can store only one value at a time whereas, in non-primitive data type, we can store multiple values either the same type or different type or both.
3. All the data for primitive type variables are stored on the stack whereas, for reference types, the stack holds a pointer to the object on the heap.
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