Amit Kumar's Blog

Yes, they really can. Yesterday, I noticed that one of the sequence number (pol_no_seq) in our IH application was giving different set of results when accessed (pol_no_seq.nextval) from two different machines. When I shared this observation with colleagues, the feedback was something like "It does not make sense" and frankly speaking, even I thought the same :-) But, how could I ignore what I actually saw with my own eyes ? I was really puzzled. Given below is the explanation of what and why it happenned, based on my findings from some forums: Definition of pol_no_seq : CREATED 25-JAN-07 LAST_DDL_TIME 25-JAN-07 SEQUENCE_OWNER INSURANCE SEQUENCE_NAME POL_NO_SEQ MIN_VALUE 1 MAX_VALUE 1000000000000000000000000000 INCREMENT_BY 1 CYCLE_FLAG N ORDER_FLAG N CACHE_SIZE 200 LAST_NUMBER 2802765 Results : Machine A : pol_no_seq.nextval->28000146 Machine A : pol_no_seq.nextval->28000147 Machine B : pol_no_seq.nextval->28000412 Machine ...

So many times, I have seen that there are many ways of achieving a result in java. Most often, we tend to use clasess/methods provided by JDK which is infact a good practise but sometimes, it is actually quite simpler without using them. Hey, what if we have a task of developing a small java program to list the names of all files in a particular directory. It looks like the simplest way of achieveing this would be : Using File.list() or File.listFiles() after confirming that current file is a directory. However, there could be another simpler way which does not use utility methods of File class: public class dirList { public static void main(String args[]) { for (int i=0; i<args.length;i++) { System.out.println(args[i]); } } } Now, compile and run this program dirList from the particualr directory whose listing is to be done. The argument to be passed is asterisk (*) .. i.e. java dirList * This would give us desired result. Actually, * in...