Просмотр исходного текста страницы Java Tutorial/Class Definition/Static Import

==  Static import ==




<p>In Java 5 you can import static fields using the import static keywords.</p>
<p>Before Java 5, to use a static final field in the Calendar class, you must first import the Calendar class.</p>

   
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    <source lang="java">
import java.util.Calendar;</source>
    
   
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==  Static importing the Math Class Methods ==






   
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    <source lang="java">
import static java.lang.Math.sqrt;
public class MainClass {
  public static void main(String[] arg) {
    System.out.println(sqrt(2));
  }
}</source>
    
   
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<pre class=codeResult>1.4142135623730951</pre>



==  Use static import to bring sqrt() and pow() into view. ==






   
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    <source lang="java">
import static java.lang.Math.pow;
import static java.lang.Math.sqrt;
class Hypot {
  public static void main(String args[]) {
    double side1, side2;
    double hypot;
    side1 = 3.0;
    side2 = 4.0;
    hypot = sqrt(pow(side1, 2) + pow(side2, 2));
    System.out.println("Given sides of lengths " + side1 + " and " + side2 + " the hypotenuse is "
        + hypot);
  }
}</source>
    
   
  <!-- end source code -->