Java - Data Types

One of the most important parts of learning any programming language is to understand what are the available data types, and how data is stored, accessed and manipulated in that language. Based on the data type of a variable, the operating system allocates memory to the variable and decides what can be stored in the reserved memory.

There are two types of data types in Java which are categorized below:

• Primitive Data Types: This includes boolean, char, byte, short, int, long, float and double.
• Non-primitive Data Types: This includes String, Interfaces, Classes etc.

Primitive Data Types

The table below describes primitive data types of Java in detail:

The example below shows how to create different primitive data types in a Java program.

public class MyClass {
  public static void main(String[] args) {       
    boolean i = true;
    char j = 'A';
    byte k = 10;
    short l = 10;
    int m = 10;
    long n = 10L;
    float o = 10.5f;
    double p = 10.5d; 

    //printing data types
    System.out.println("i is a boolean. i = " + i); 
    System.out.println("j is a char. j = " + j); 
    System.out.println("k is a byte. k = " + k); 
    System.out.println("l is a short. l = " + l); 
    System.out.println("m is an int. m = " + m); 
    System.out.println("n is a long. n = " + n); 
    System.out.println("o is a float. o = " + o); 
    System.out.println("p is a double. p = " + p); 
  }
}

The output of the above code will be:

i is a boolean. i = true
j is a char. j = A
k is a byte. k = 10
l is a short. l = 10
m is an int. m = 10
n is a long. n = 10
o is a float. o = 10.5
p is a double. p = 10.5