Tricky way to convert an array list into a comma separated string

Today my husband suggested me a good way to convert an array list into string, i found it very efficient so sharing with you all.

Created a list l, added megha, dwivedi and jain into it. Need to store - megha, dwivedi, jain into a string so used toString() method.

List l = new ArrayList();
l.add("megha");
l.add("dwivedi");
l.add("jain");
String s = l.toString().substring(1, l.toString().length()-1);

If we perform toString on the list the output will be -

[megha, dwivedi, jain]

but i dont need square brackets so used substring method to cut 1st and last character, so variable 's' will contain - megha, dwivedi, jain

Other inefficient way which comes first in our mind is to iterate through list, get string one by one and append it comma separated, but using the above mentioned way we can avoid all those unnecessary loops and variables.

Thanks to my husband for explaining the same ;)

Run java code without main method

public class test{

 static{

System.out.println("M printing :p");

System.exit(0);

}

}

As soon as class loads it will run static initializer and before it tries to search for main method, we are exiting the program with System.exit, so prints the message and then will exit normally(without throwing any exception)

SQL related interview question

How to get the below outputs when executing a select on say employee table(suppose employee table is empty)-

1) No rows found

2) Zero rows found

Any idea??? :)

select * from employee  ---- it will give 1st output

and

select count(*) from employee -- it will give 2nd output

It looks so simple but doesn't click in mind when being interviewed :)