rotator.java

来自「这是java的一本书上的源代码」· Java 代码 · 共 60 行

// Fig. 25.14: Rotator.java
// A JavaBean that rotates advertisements.
package com.deitel.jhtp5.jsp;

public class Rotator {
   private String images[] = { "images/advjHTP1.jpg",
      "images/cppHTP4.jpg", "images/iw3HTP2.jpg",
      "images/jwsFEP1.jpg", "images/vbnetHTP2.jpg" };
      
   private String links[] = {
      "http://www.amazon.com/exec/obidos/ASIN/0130895601/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/0130384747/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/0130308978/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/0130461342/" + 
         "deitelassociatin",
      "http://www.amazon.com/exec/obidos/ASIN/0130293636/" + 
         "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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