Data types in Java

Every variable in java has a data type. Data types specify the type and size of the value that can be stored.

 

Type	Size	Minimum Value	Maximum Value
Byte	1 byte	128	127
Short	2 bytes	32,768	32,767
Int	4 bytes	2,147,483,648	2,147,483,647
long	8 bytes	923,372,036,854,775,808	923,372,036,854,775,807

 

                                             Size and Range of Integer Data types

Reading Data from Keyboard

readLine() is used to take input from the user in java .

import java.io.DataInputStream;

class reading

{

Public static void main ( String args[])

{

DataInputStream in = new DataInputStram(System.in);

Int intnumber = 0;

Float floatnumber = 0.0f:

Try

{

System.out.println(“Enter an Integer : “ );

Int number = Integer.parseInt(in.readLine());

System.out.println(“Enter a Float number “);

Floatnumber = Float.valueOf(in.readLine()).floatValue();

}

Catch( Exception e ){}

System.out.println(“ Integer number “ + intnumber);

System.ouyt.println(“ Float Value “ + floatNumber);

}

}

The intereactive input and output of the above program is as follows :

Enter and integer :

123

Enter a float number

123.45

Int number = 123

Floatnumber = 123.45

Command Line Args Scope of Variables