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 Java have two Data types  

• Primitive data types  Ex : 

• Primitive data types in Java can be divided into three main categories:

  • Integral types : represent signed integers (byte, short, int, long) and unsigned character values (char)

  • Floating point types : (float, double) : represent fractional signed numbers

  • Boolean type  (boolean) : represent logical values (true , false)

• Non-primitive data types Ex :
•  String, Arrays and Classes

How To Use Data Type and  Declaring and Initializing Variables   

     byte b = 127 ; 

     short v = 32767;

     int bb = 2147483645 ; 

     long  vv = 9223372036854775807L;     

     char l = 'D';

     String name = "ajalks sdjksdskldd skdsk897878d 8789ds" ;   

    

     float fv  = 12.12f ;

     double df = 3232.323232 ;

     

     boolean nm = true;

     boolean nv = false;    

    

     String j = "java 99"; //  Declaring and Initializing Variables     

     

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