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== Define a constant value and use it ==

<OL><LI>Using the final keyword to declare a variable.</LI><LI>The final keyword specifies that the value of a variable is final and cannot be changed.</LI><LI>It is a convention in Java to write constants in uppercase letters.</LI></OL>



<source lang="java">
public class MainClass {
public static void main(String[] arg) {
final int FEET_PER_YARD = 3; // Constant values
final double MM_PER_INCH = 25.4; // that cannot be changed
System.out.println(FEET_PER_YARD);
System.out.println(MM_PER_INCH);

}
}</source>



<pre class=codeResult>3
25.4</pre>

== Define constant ==

<p>"public static final" variables are constant.</p>
<p>The naming convention for static final variables is to have them in upper case and separate two words with an underscore.
For example:</p>



<source lang="java">
static final int NUMBER_OF_MONTHS = 12;
static final float PI = (float) 22 / 7;</source>

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Admin: 1 версия

в 17:44, 31 мая 2010