java - attempting to get class names from a different package -

have got 2 projects javaapplication2 , javaapplication1. same being package names. in javaapplication2 ive imported javaapplication1 using

import javaapplication1.*; 

i need list classses in packeage. how achieve this? tried simple code gets null exception.

package pck; pck = package.getpackage("javaapplication1"); system.out.println(pck.getclass()); 

i don't have enough rep comment on question or mark such, duplicate of:

getting classes package

there many answers listed on question - instance top looking classes implement icommand, implement need remove:

if (icommand.class.isassignablefrom(cls)) {   commands.add((class<icommand>) cls); } 

from loop , have want.