java - Jtree inside JScrollPanel not working -

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defaultmutabletreenode mycomputer = new defaultmutabletreenode("my computer"); defaultmutabletreenode c = new defaultmutabletreenode("local disk(c:)"); defaultmutabletreenode vinod = new defaultmutabletreenode("vinod"); defaultmutabletreenode swing = new defaultmutabletreenode("swing"); defaultmutabletreenode tr = new defaultmutabletreenode("tree"); defaultmutabletreenode = new defaultmutabletreenode("3½ floppy(a:)"); defaultmutabletreenode e = new defaultmutabletreenode("new volume(e:)"); c.add(vinod); vinod.add(swing); swing.add(tr); mycomputer.add(c); mycomputer.add(a); mycomputer.add(e);   jtree tree = new jtree(mycomputer); jscrollpane scrollpane = new jscrollpane(tree); jpanel1.add(scrollpane); tree.setvisible(true);

i got new tree example web, when try show it, not appear! dont know why. ideas? thank you!

adjusted code sscce, works fine here

  public static void main( string[] args ) {     eventqueue.invokelater( new runnable() {       @override       public void run() {         jframe frame = new jframe();          defaultmutabletreenode mycomputer = new defaultmutabletreenode("my computer");         defaultmutabletreenode c = new defaultmutabletreenode("local disk(c:)");         defaultmutabletreenode vinod = new defaultmutabletreenode("vinod");         defaultmutabletreenode swing = new defaultmutabletreenode("swing");         defaultmutabletreenode tr = new defaultmutabletreenode("tree");         defaultmutabletreenode = new defaultmutabletreenode("3½ floppy(a:)");         defaultmutabletreenode e = new defaultmutabletreenode("new volume(e:)");         c.add(vinod);         vinod.add(swing);         swing.add(tr);         mycomputer.add(c);         mycomputer.add(a);         mycomputer.add(e);           jtree tree = new jtree(mycomputer);         jscrollpane scrollpane = new jscrollpane(tree);         frame.getcontentpane().add(scrollpane);         tree.setvisible(true);          frame.setdefaultcloseoperation( windowconstants.exit_on_close );         frame.pack();         frame.setvisible( true );       }     } );   }

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