AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  testing for object ancestry          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message haddock Guest Posted: Tue Mar 22, 2005 3:07 pm    Post subject: testing for object ancestry hi all this is bugging me for a while, it should be really simple, but somehow I'm unable to look this one up myself... (I don't even know where to look for it) In my program I'd like to test, if the component that throws the FocusGained Event is a member of the JTextComponent family, e.g. a JTextField or a JTextArea, etc. How can I write the line marked with *** do Java will understand what I want? thanks! ------------------------------------------------------------------- public void focusGained(FocusEvent event) { Component comp = event.getComponent(); *** if (comp is a JTextComponent) doSomethingSpecial(); } ------------------------------------------------------------------- Back to top Ulf_N Guest Posted: Tue Mar 22, 2005 3:22 pm    Post subject: Re: testing for object ancestry haddock skrev: Quote: hi all this is bugging me for a while, it should be really simple, but somehow I'm unable to look this one up myself... (I don't even know where to look for it) In my program I'd like to test, if the component that throws the FocusGained Event is a member of the JTextComponent family, e.g. a JTextField or a JTextArea, etc. How can I write the line marked with *** do Java will understand what I want? thanks! ------------------------------------------------------------------- public void focusGained(FocusEvent event) { Component comp = event.getComponent(); *** if (comp is a JTextComponent) doSomethingSpecial(); } ------------------------------------------------------------------- Shouldn't this work: if (comp instanceof JTextComponent) ... /ulf Back to top haddock Guest Posted: Thu Mar 24, 2005 6:08 pm    Post subject: Re: testing for object ancestry thanks so much Ulf, I knew it was a very basic thing... 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.