AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Populating an Object[][]          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Guest Posted: Wed Apr 19, 2006 9:12 pm    Post subject: Populating an Object[][] I have a HashMap and I need to fill a 2-dimential array, Object[][], with the key-value pairs. I need to do this to supply a JTable with the data from the HashMap. I do not know what data is in the HashMap or what the key names are. Can someone please show me how to do this? Thanks! Back to top Monique Y. Mudama Guest Posted: Wed Apr 19, 2006 9:12 pm    Post subject: Re: Populating an Object[][] On 2006-04-19, MikeSmith813 (AT) gmail (DOT) com penned: Quote: I have a HashMap and I need to fill a 2-dimential array, Object[][], with the key-value pairs. I need to do this to supply a JTable with the data from the HashMap. I do not know what data is in the HashMap or what the key names are. Can someone please show me how to do this? It's not clear to me what you're finding difficult about this. Some code and a "here's where I get stuck" indicator would be helpful. I would iterate over the keySet(). That gives you each key, and with the key you can use the get(Object key) method to get the value. Does that help? -- monique Help us help you: http://www.catb.org/~esr/faqs/smart-questions.html Back to top Eric Sosman Guest Posted: Wed Apr 19, 2006 9:12 pm    Post subject: Re: Populating an Object[][] MikeSmith813 (AT) gmail (DOT) com wrote On 04/19/06 16:37,: Quote: I have a HashMap and I need to fill a 2-dimential array, Object[][], with the key-value pairs. I need to do this to supply a JTable with the data from the HashMap. I do not know what data is in the HashMap or what the key names are. Can someone please show me how to do this? The most direct approach is probably to use the entrySet() method on the Map. This method returns a Set whose elements are Map.Entry objects, each of which holds a key and the corresponding value. Iterate over the Set to visit all the Map.Entry objects, and extract a key and a value from each to populate your array. -- Eric.Sosman (AT) sun (DOT) com Back to top Jubz Guest Posted: Thu Apr 20, 2006 3:12 am    Post subject: Re: Populating an Object[][] HashMap myMap; // Initialized elsewhere Object[][] myArray = new Object[myMap.size()][2]; int row = 0; for (Iterator i = myMap.keySet().iterator(); i.hasNext(); row++) { Object key = i.next(); Object value = myMap.get (key); myArray[row][0] = key; myArray[row][1] = value; } Sort of old school, but it'll work. Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java Help All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.