wood burning stoves
The moose likes Beginning Java and the fly likes why hash map contains null Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "why hash map contains null" Watch "why hash map contains null" New topic

why hash map contains null

Puneet N Vyas
Ranch Hand

Joined: Sep 20, 2007
Posts: 61
can any one tell why the patternAsso hashmap contains null value even after being populated with values.

thanks for support

Christophe Verré

Joined: Nov 24, 2005
Posts: 14688

import java.lang.*;
import java.util.*;
import java.io.*;
import java.util.regex.*;

public class pattern
patternAsso's keys are made of values taken from patternStrings3.
patternStrings3 is made of p1[hh]+items[mm]+items[nn].
So it will look like "a.* aa", "a.* ab", "a.* ac"...
You forgot that p1 values contains a space. What you want to do is :

PS : try to remove the useless commented code next time

[My Blog]
All roads lead to JavaRanch
Puneet N Vyas
Ranch Hand

Joined: Sep 20, 2007
Posts: 61
@thanks ,i have figured out the problem,sorry,i will follow the rules from next time..

thanks and regards
puneet vyas
I agree. Here's the link: http://aspose.com/file-tools
subject: why hash map contains null
jQuery in Action, 3rd edition