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public   class   Test{  
          public   static   void   main(String   args[]){  
                  System.out.println(0.05+0.01);  
                  System.out.println(1.0-0.42);  
                  System.out.println(4.015*100);  
                  System.out.println(123.3/100);  
          }  
};  
   
ÄãûÓп´´í£¡½á¹ûȷʵÊÇ  
0.060000000000000005  
0.5800000000000001  
401.49999999999994  
1.2329999999999999  
   
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Õâ¸öÎÊÌâÏ൱ÑÏÖØ£¬Èç¹ûÄãÓÐ9.999999999999Ôª£¬ÄãµÄ¼ÆËã»úÊDz»»áÈÏΪÄã¿ÉÒÔ¹ºÂò10ÔªµÄÉÌÆ·µÄ¡£  
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public   double   round(double   value){&


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¼ò µ¥ µÄ Java³Ì Ðò

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public class HelloWorldApp { //an application
public static void main (String args[ ]){
System.out.println("Hello World!");
}
}
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Java Type VS Hibernate Type

Java Class Attribute Type         Hibernate Type               Possible SQL Type-Vendor Specific
Integer, int, long short &n ......

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¡¡ ¡¡protected byte[] encrypt(byte[] obj) ...{
¡¡¡¡try ...{
¡¡¡¡MessageDigest md5 = MessageDigest.getInstance("MD5");
¡¡¡¡md5.update(obj);
¡¡¡¡return md5.digest();
¡¡¡¡} catch (NoSuchAlgorithmException e) ...{
¡¡¡¡e.printStackTrace();
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arcgis server9.3 for java °²×°

   ArcGIS Server9.3ÍêÕûÇåÎú°²×°Á÷³Ì
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public static void reduceImg(String imgsrc, int widthdist, int heightdist) {
  try {
   File srcfile = new File(imgsrc);
   if (!srcfile.exists()) {
    return;
   }
    ......
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