Java Utils

Some of my past works include the use of various JDK API:

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Adler32 API Usage:
What is this API used for ?
Checksum is the answer. To compute the Adler-32 checksum of a data stream.
We need this in order to know if a data stream has changed in time.
Set the checksum and then read the file again to see if the checksum has changed. if so , meaning file has changed.
Check the code here.

 String fileContents = null;
 long adlerCheckSumValue = 0l;
 // read the file contents into fileContents as a string.
 Adler32 adlerCheckSum = new Adler32();
 checkSum.update(fileContents.getBytes());
 adlerCheckSumValue = adlerCheckSum .getValue();

 OR

 //get the check sum value from the given input stream.
  
 CheckedInputStream cis = new CheckedInputStream(inputStream, adlerCheckSum );
while (cis.read() != -1) {
         //Do nothing here
      }

      adlerCheckSumValue  =  adlerCheckSum .getValue();

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Simple log4j logging configuration for simple utilities:
The Pattern logs this way :

[ INFO ]:: 2007-06-26 17:42:42,001:: com.xxx.xxx.xx.XXXXX.main(XXXXX.java:147):: This is the log message...

String pattern =  "[ %p ]";
        pattern += ":: %d";        
        pattern += ":: %l";
        pattern += ":: %m %n"; 
 
        PatternLayout layout = new PatternLayout(pattern);
        FileAppender appender = new FileAppender(layout, filePath);
        Logger logger = Logger.getLogger(theClass);
        logger.addAppender(appender); 

filepath is the absolute path with log file name.
theClass is the class object.

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