rotator.java

高级java2 大学教程(含源码,经典的Java学习教程

// Fig. 10.17: Rotator.java
// A JavaBean that rotates advertisements.
package com.deitel.advjhtp1.jsp.beans;

public class Rotator {
   private String images[] = { "images/jhtp3.jpg",
      "images/xmlhtp1.jpg", "images/ebechtp1.jpg",
      "images/iw3htp1.jpg", "images/cpphtp3.jpg"};
      
   private String links[] = {
      "http://www.amazon.com/exec/obidos/ASIN/0130125075/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/0130284173/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/013028419X/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/0130161438/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/0130895717/" + 
         "deitelassociatin" };
         
   private int selectedIndex = 0;

   // returns image file name for current ad
   public String getImage()
   {
      return images[ selectedIndex ];
   }

   // returns the URL for ad's corresponding Web site
   public String getLink()
   {
      return links[ selectedIndex ];
   }
   
   // update selectedIndex so next calls to getImage and 
   // getLink return a different advertisement
   public void nextAd()
   {
      selectedIndex = ( selectedIndex + 1 ) % images.length;      
   }
}


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