Literals

   

Java™ 2 Primer Plus
By Steven Haines, Steve Potts

Table of Contents
Chapter 2.  Keywords, Data Types, and Variables


A literal represents an actual character, string, or number and not a variable referencing, a character, string, or number in memory. The following are examples of literals:

 1.0  'c'  "Happy"  7 

In an expression (detailed in the next chapter) you might add 5 to an integer variable:

 int n = a + 5; 

In this case a is a variable and 5 is a literal value.

When defining numeric literals there are circumstances where you will have to tell the Java compiler how to interpret the value (what data type it is). When defining a floating-point number such as 1.0, the compiler automatically interprets the value as a double if you want it to be interpreted as a float, you would have to append an f to it. For example:

 float f = 1.0f 

A failure to do so would result in a compilation error stating that you might lose precision in the assignment (because a double is represented by eight bytes and a float is only represented by four).


       
    Top
     



    Java 2 Primer Plus
    Java 2 Primer Plus
    ISBN: 0672324156
    EAN: 2147483647
    Year: 2001
    Pages: 332

    Similar book on Amazon

    flylib.com © 2008-2017.
    If you may any questions please contact us: flylib@qtcs.net