java - Exception is never thrown in body of corresponding try statement -

i have problem exception handling in java, here's code. got compiler error when try run line: throw new mojexception("bledne dane");. error is:

exception mojexception never thrown in body of corresponding try statement

here code:

public class test {   public static void main(string[] args) throws mojexception {     // todo auto-generated method stub      for(int i=1;i<args.length;i++){       try{         integer.parseint(args[i-1]);       }       catch(mojexception e){         throw new mojexception("bledne dane");       }       try{         wiersztrojkatapascala = new wiersztrojkatapascala(integer.parseint(args[0]));         system.out.println(args[i]+" : "+a.wspolczynnik(integer.parseint(args[i])));       }       catch(mojexception e){         throw new mojexception(args[i]+" "+e.getmessage());       }     }   } } 

and here code of mojexception:

public class mojexception extends exception{     mojexception(string s){         super(s);     } } 

can me this?

a catch-block in try statement needs catch exactly exception code inside try {}-block can throw (or super class of that).

try {     //do throws exceptiona, e.g.     throw new exceptiona("i exception alpha!"); } catch(exceptiona e) {     //do handle exception, e.g.     system.out.println("message: " + e.getmessage()); } 

what trying this:

try {     throw new exceptionb("i exception bravo!"); } catch(exceptiona e) {     system.out.println("message: " + e.getmessage()); } 

this lead compiler error, because java knows trying catch exception never ever ever occur. get: exception exceptiona never thrown in body of corresponding try statement.