Getting Values of Variables

 The values of the variable are displayed on the VUD by using the following two methods

                     i.            Print ( )

                   ii.            Println ( )

Print ( ) method prints the output on a line until a newline character is encountered.

Println ( ) method prints the output on a line and the control comes to the new line.

The above two methods are invoked by using the object systems. Out as shown below.

                                                        System.out.print  ( );

                                                        System.out.println ( );

Example:

System.out.print (“Good”)

System.out.print (“Luck”)

The output is 

                       Good Luck

System.out.println (“Good”)

System.out.println (“Luck”)

The output is 

                    Good

                     Luck

System.out.print (“Good\n”)

System.out.print (“Luck”)

The output is 

                         Good

                         Luck

Java variables:

A variables refers to the name given to the memory location to store data. A particular memory location is given only one name. yet this name is called a variable because this memory location can store sequence of different values during the execution of the same program.

Rules:

1. A variable name is formed with alphabets, digits, underscore( _ ), dollar sign.

2 . The first character must be an alphabet.

3 . Variable name can be of any length.

4 . Both upper case and lower case letters are used. But they are not treated as same.

5 . It should not be a keyword word.

Example:

1.       The following are some valid variable names.

AO          BASIC_PAY         volume                 B12

2.       The following are some invalid variable names.

Variable	Reason for invalidity
AB 9A While	Period ( ) not allowed The first character should be an alphabet Reserved word