Java - Numbers

Integers

1. int Data Type

   
   
   The Data Type for a whole number is int.
   
   The Int data type is used to store whole numbers from -2147483648 to 2147483647. And takes 4 bytes of memory.
   
   

   Example :

   
   
   

   public class MyApplication
   {
   	public static void main(String[] args) {
   	
   		int x = -34535;
   		System.out.println(x);
   	}
   }
   

   
   
   

   Output :

   
   
   
     -34535



2. byte Data Type

   
   
   The Data Type for a whole number is byte.
   
   The byte data type is used to store whole numbers from -128 to 127. And takes 1 byte of memory.
   
   

   Example :

   
   
   

   public class MyApplication {
   	public static void main(String[] args) {
   	
   		byte x = 34;
   		System.out.println(x);
   	}
   }
   

   
   
   

   Output :

   
   
   
     34



3. short Data Type

   
   
   The Data Type for a whole number is short.
   
   The byte data type is used to store whole numbers from -32768 to 32767. And takes 2 bytes of memory.
   
   

   Example :

   
   
   

   public class MyApplication {
   	public static void main(String[] args) {
   		
   		short x = 32535;
   		System.out.println(x);
   	}
   }
   

   
   
   

   Output :

   
   
   
     32535



4. long Data Type

   
   
   Say, we have a large value 3372036854775808.
   
   Well! In this case int data type will not be able to hold that value.
   
   And in this scenario, we need a long data type.
   
   A long data type is used to store whole numbers from -9223372036854775808 to 9223372036854775808. And takes 8 bytes of memory.
   
   For example 3372036854775808.
   
   

   Example :

   
   
   

   public class MyApplication
   {
   	public static void main(String[] args)
   	{
   		long x = 3372036854775808L;
   		System.out.println(x);
   	}
   }
   

   
   
   

   Output :

   
   
   
     3372036854775808
   
   
   So, in the above example, we have created a variable x of type long. And assigned a large value 3372036854775808 to it.
   
   Note : You must use suffix 'L' with the value '3372036854775808', i.e. '3372036854775808L' to denote the value is of long data type.



5. Float Data Type

   
   
   A float data type is used to hold floating point numbers. And is used to hold the floating point numbers of 4 bytes.
   
   For example 5.987.
   
   

   Example :

   
   
   

   public class MyApplication
   {
   	public static void main(String[] args)
   	{
   		float x = 5.987F;
   		System.out.println(x);
   	}
   }
   

   
   
   

   Output :

   
   
   
     5.987
   
   
   So, in the above example, we have created a variable x of type float. And assigned the value 5.987 to it.
   
   

   float x = 5.987F;

   
   
   Just note, we have mentioned 5.987F instead of the number 5.987. This is an additional step you need to write to tell Java that 5.987 is a Floating point number.



6. double Data Type

   
   
   A double data type is used to hold floating point numbers. And is used to hold the floating point numbers of 8 bytes.
   
   It is almost same as Float data type. Just that it can hold a floating point number of a larger size.
   
   For example 5.987434343434343434343.
   
   

   Example :

   
   
   

   public class MyApplication
   {
   	public static void main(String[] args)
   	{
   		double x = 5.98743486215732D;
   		System.out.println(x);
   	}
   }
   

   
   
   

   Output :

   
   
   
     5.98743486215732
   
   
   So, in the above example, we have created a variable x of type Double. And assigned the value 5.98743486215732 to it.
   
   

   double x = 5.98743486215732D;