contentpane - Java getContentPane() NullPointerException on JFormatterTextField -

-

i trying create jformatted text field, when try add it, nullpointerexception gets thrown @ me. checked if stuff in correct order or if isn't null, doesn't seem so. might wrong though.

here block of code 

public static void showtopic(string path) throws ioexception{     path = "topics/"+path+".txt";     system.out.println(path);     string[] topicfile = login.readfile(path);     int b =  login.readlines(path);      topic.main(null);     jformattedtextfield formattedtextfield = new jformattedtextfield();     formattedtextfield.seteditable(false);     formattedtextfield.setbounds(50, 50, 100, 100);       (int i=0;i<b;i++)         formattedtextfield.settext(topicfile[i]);      topic.contentframe.getcontentpane().add(formattedtextfield);   }

and window frame

import java.awt.eventqueue;   public class topic {      static jframe contentframe;      /**      * launch application.      */     public static void main(string[] args) {         eventqueue.invokelater(new runnable() {             public void run() {                 try {                     topic window = new topic();                     window.contentframe.setvisible(true);                 } catch (exception e) {                     e.printstacktrace();                 }             }         });     }      /**      * create application.      */     public topic() {         initialize();     }      /**      * initialize contents of frame.      */     private void initialize() {         contentframe = new jframe();         contentframe.setbounds(100, 100, 550, 539);         contentframe.setdefaultcloseoperation(jframe.exit_on_close);         contentframe.getcontentpane().setlayout(null);          jbutton btnnewbutton = new jbutton("new button");         btnnewbutton.setbounds(435, 0, 89, 23);         contentframe.getcontentpane().add(btnnewbutton);      }  }

thanks in advance :)


Comments

Post a Comment

Popular posts from this blog

c# - Unity IoC Lifetime per HttpRequest for UserStore -

-
i'm trying clean default implementation of accountcontroller.cs comes out of box in new mvc5/owin security implementation. have modified constructor this: private usermanager<applicationuser> usermanager; public accountcontroller(usermanager<applicationuser> usermanager) { this.usermanager = usermanager; } also, have created lifetime manager unity looks this: public class httpcontextlifetimemanager<t> : lifetimemanager, idisposable { private httpcontextbase _context = null; public httpcontextlifetimemanager() { _context = new httpcontextwrapper(httpcontext.current); } public httpcontextlifetimemanager(httpcontextbase context) { if (context == null) throw new argumentnullexception("context"); _context = context; } public void dispose() { this.removevalue(); } public override object get...
Read more

Change the color of an oval at click in Java AWT -

-
i have draw ovals in java, , @ click change color. beginning tried change color after 20 ms, doesn't work. my code is: public class mycomponentnew extends frame { public graphics2d g2d; public mycomponentnew(string title) { super(title); setsize(400, 550); } @override public void paint(graphics g) { this.g2d = (graphics2d) g; this.g2d.setcolor(color.red); this.g2d.filloval(10, 55, 50, 100); } public void changecolor () { this.g2d.setcolor(color.blue); this.g2d.filloval(10, 55, 50, 100); } } and in class main method have: mycomponentnew m; m = new mycomponentnew("fereastra cu baloane"); m.setvisible(true); m.addwindowlistener(new windowadapter() { @override public void windowclosing(windowevent we) { system.exit(0); } }); try { thread.sleep(20); } catch(interruptedexception e) {} m.changecolor(); the color of oval remains red. ...
Read more

I am trying to solve the error message 'incompatible ranks 0 and 1 in assignment' in a fortran 95 program. -

-
i writing program in fortran find velocity of parachuting person in relation time. keep getting error can't fix. new programming , appreciated. the error is v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) 1 error: incompatible ranks 0 , 1 in assignment @ (1) and program is program para integer :: real :: v(11) !velocity real :: q !initial velocity real :: h !time step real :: c !drag coefficient real :: m !mass ! gravity equal 32 ft/s^2 write (*,*)'enter time step' read(*,*)h write(*,*)'enter initial velocity' read(*,*)q write(*,*)'enter drag coefficient' read(*,*)c write(*,*)'enter mass' read(*,*)m i=1,10 ! 1 10, 1 being interval. end v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) q=v(1) end program you cannot use [] normal parenthesis in expressions. array constructor, [ items ] means array items elements. end do should after line.
Read more