Declaring Data Types in Java

http://www.roseindia.net/java/master-java/java-data-types.shtml

Examples

public class identifierandpdatatype{
  public static void main(String[] args){
  byte byteident = 3;
  short shortident=100;
  int intident = 10;
  long longident = 40000;
  char charident = 'a';
  String stringident = "chandan";
  float floatident = 12.0045f;
  double doubleident = 2333333.000000000033343343434f;
  System.out.println(byteident + " is the value of identifire 

named 'byteident' which primitive data type is byte.");
  System.out.println(shortident + " is the value of 

identifire named 'shortident' which primitive data type is short.");
  System.out.println(intident + " is the value 

of identifire named 'intident' which primitive data type is int.");
  System.out.println(longident + " is the value 

of identifire named 'longident' which primitive data type is long.");
  System.out.println(charident + " is the value 

of identifire named 'charident' which primitive data type is char.");
  System.out.println(stringident + " is the value

 of identifire named 'stringident' which primitive data type is string.");
  System.out.println(floatident + " is the value 

of identifire named 'floatident' which primitive data type is float.");
  System.out.println(doubleident + " is the value

 of identifire named 'doubleident' which primitive data type is double.");
  }
}

Please go through the link, may this will be helpful for you.

http://www.roseindia.net/java/beginners/identifierandpdatatype.shtml