Answer Posted / deepesh

An "Iterator object" is used to move through a Collection,
by calling Collection's iterator() method. By using for
loop, you are limited to that particular collection you are
traversing, while iterator gives freedom to work with any
collection.

iterator's job is to move through the sequence (without the
client programmer knowing or caring about the underlying
structure & its modification) using hasNext() and next().
remove() is provided "to remove the last element returned by
the iterator" and is called only per call after next().

Iterator can be used for Lists and Sets for forward
(unidirectional) traversal of elements without knowing their
size, which is nearly same concept for for-each loop.

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Is there any way to find whether software installed in the system is registered by just providing the .exe file? I have tried the following code but its just displaying the directory structure in the registry. Here the code : package com.msi.intaller; import java.util.Iterator; import ca.beq.util.win32.registry.RegistryKey; import ca.beq.util.win32.registry.RootKey; public class RegistryFinder { public static void main(String... args) throws Exception { RegistryKey.initialize(RegistryFinder.class.getResource("jRe gistryKey.dll").getFile()); RegistryKey key = new RegistryKey(RootKey.HKLM, "Software\\ODBC"); for (Iterator subkeys = key.subkeys(); subkeys.hasNext();) { RegistryKey subkey = subkeys.next(); System.out.println(subkey.getName()); // You need to check here if there's anything which matches "Mozilla FireFox". } } }

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