Primitive and Non Primitive Data types ,Difference between primitive and non-primitive data types

 

Primitive and Non Primitive Data types

A data type is an attribute of a variable which tells the compiler or interpreter how the programmer intends to use the variables. It defines the operations that can be done on the data and what type of values can be stored. In this article, I will give you a brief insight into the different data types in java. According to the properties they possess, data types are divided into two groups:

1. Primitive Data Types
2. Non-Primitive Data Types

 Primitive Data Types: 

A primitive data type is pre-defined by the programming language. The size and type of variable values are specified, and it has no additional methods.

Non-Primitive Data Types: 

These data types are not actually defined by the programming language but are created by the programmer. They are also called “reference variables” or “object references” since they reference a memory location which stores the data.

Now, let’s move further and get into the details of Primitive Data Types.

Primitive Data Types

Data types in Java are classified into 4 aspects as int, float, character and boolean. But, in general, there are 8 data types. They are as follows:

• byte data type
• boolean data type
• char data type
• short data type
• int data type
• long data type
• float data type
• double data type

You can refer to the below figure to understand the different data types with respect to the memory allocated to them, and there defaults values

That was all about the data type. I hope you understood it. Now let’s understand each of these data types in depth i.e. byte data type.

01. Byte data type

This is an example of a primitive data type. It is an 8-bit signed two’s complement integer. It stores whole numbers that lie between -128 to 127. A byte data type is helpful for saving memory in large amounts. Now let’s write a small program and understand how it works.

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class ByteDatatype { public static void main(String[] args) { byte a, b; a = 127; b=177; System.out.println(a); // prints 127 System.out.println(b); // throws an error because it cannot store more than 127 bits } }

Now let’s understand what is boolean data type.

02. boolean data type

A boolean data type comprises of a bit of information and can store only true or false values. This data type is used to track true/false conditions. Now let’s write a small program and understand how it works.

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class boolean{ public static void main(String args[]){ boolean language = true; boolean Number= false; System.out.println(language);   // Output will be true System.out.println(Number);  // Output will be false } }

That was all about the boolean data type. Now let’s move further and comprehend the following data type i.e. short

03. short data type

A short data type is greater than byte in terms of size and less than a integer. It stores the value that ranges from -32,768 to 32767. The default size of this data type: 2 bytes. Let’s take an example and understand the short data type. 

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class Short { public static void main(String[] args) { short c= 3435, System.out.println(c); // prints the value present in n i.e. 3435 } }

Moving ahead, let’s move further and look at the next data type i.e. i char data type

04. char data type

This data type is used to store a single character. The character must be enclosed within single quotes, like ‘F’ or ‘f’. Alternatively, you can also use ASCII values to display certain characters. Let’s take a small example and see how it works.

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char  beta = 'J'; char a = 65, b = 66, c = 67; System.out.println(beta ); // prints J System.out.println(a); // Displays 65 System.out.println(b); // Displays 66 System.out.println(c); // Displays 67

That was all about the char data type. I hope you understood it. Now let’s move further and understand the next data type on the list i.e. long data type.

05. long data type

This data type is a 64-bit two’s complement integer. By default, the size of a long data type is 64 bit and its value ranges from -263 to 263-1.

For example:

1 2	long number = 15000000000L; System.out.println(number ); // prints 15000000000

That was all about the long data type. Now let’s move and see int data types.

06. int data type

This data type can store whole numbers from -2147483648 to 2147483647. Generally, int is the preferred data type when you create variables. with a numeric value.

For example:

1 2	int number = 5464564; System.out.println(number ); // prints 5464564

Having understood this, now let’s see which is the next data type in the list.

07. Floating Datatypes

You should use a floating point type whenever you need a number with a decimal, such as 8.88 or 3.14515.

01. float data type

This data type can store fractional numbers from 3.4e−038 to 3.4e+038. Note that you should end the value with an “f”. Let’s take a small example and understand this data type in a detailed manner.

1 2	float num =67; System.out.println(num); // prints the floating number value

So this is how you can use the float data type. Now let’s see one more floating data type i.e. double

02. double data type

The double data type can store fractional numbers from 1.7e−308 to 1.7e+308. Note that you should end the value with a “d”:

1 2	double num = 79.678d; System.out.println(num); // prints double value

That was all about Double data type and this brings us to the end of Primitive Datatypes. Now let’s figure out the difference between primitive and non-primitive data types.

Difference between primitive and non-primitive data types

The  difference between primitive and non-primitive data types are as follows:

• Primitive types are predefined in java. Non-primitive types are created by the programmer and is not defined by Java.
• Non Primitive types can be used to call methods to perform certain operations, while primitive types cannot.
• A primitive type always has a value, whereas non-primitive types can be null.
• A primitive type starts with a lowercase letter, while non-primitive types start with an uppercase letter.
• The size of a primitive type depends on the data type, while non-primitive types have all the same size.

Non-Primitive Datatypes

Non-Primitive data types refer to objects and hence they are called reference types. Examples of non-primitive types include Strings, Arrays, Classes, Interface, etc. Below image depicts various non-primitive data types.

Let’s now understand these non-primitive data types in short.

Strings: 

String is a sequence of characters. But in Java, a string is an object that represents a sequence of characters. The java.lang.String class is used to create a string object.

Arrays: 

Arrays in Java are homogeneous data structures implemented in Java as objects. Arrays store one or more values of a specific data type and provide indexed access to store the same. A specific element in an array is accessed by its index.

Classes: 

A class in Java is a blueprint which includes all your data. A class contains fields(variables) and methods to describe the behavior of an object.

Structure: 

Non-primitive not just store a value, but rather a collection of values in various formats

So that was all about the non-primitive data types.

I Hope you understand different types of data types and there differences For Explanation in hindi please visit my Youtube channel 

In This blog I will explain about different types of Data types

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