java - JFrame won't show - Not an error in code -

recently every single 1 of apps extends jframe fails show frame. program run , terminate after 8 seconds without ever showing , without error message. happens programs i've made in past new programs.

for testing purposes using basic example oracle documentations.

import java.awt.borderlayout;  import javax.swing.jframe; import javax.swing.jlabel;  public class test extends jframe{      public static void main(string[] args){          //1. create frame.         jframe frame = new jframe("framedemo");          //2. optional: happens when frame closes?         frame.setdefaultcloseoperation(jframe.exit_on_close);          //3. create components , put them in frame.         jlabel emptylabel = new jlabel();         frame.getcontentpane().add(emptylabel, borderlayout.center);          //4. size frame.         frame.pack();          //5. show it.         frame.setvisible(true);     }  } 

i using eclipse , i've tried switching workplaces.

i've looked @ existing threads , found nothing wasn't due coding errors.

how can solve this?

edit: program doesn't output system.out.println() after line:

jframe frame = new jframe("framedemo"); 

it outputs before that.

alright checked code , works. first things first, jlabel isn't visible if doesn't have in it.

pack();  //basically crushes entire frame if doesn't have objects collapse on. 

also, if don't want put in jlabel, don't pack yet. set size with

frame.setsize(width,height); 

it shows nothing because collapsed without putting in jlabel. hope answered question want

import java.awt.borderlayout;  import javax.swing.jframe; import javax.swing.jlabel;  public class test extends jframe{      public static void main(string[] args){          //1. create frame.         jframe frame = new jframe("framedemo");          //2. optional: happens when frame closes?         frame.setdefaultcloseoperation(jframe.exit_on_close);          //3. create components , put them in frame.         jlabel emptylabel = new jlabel("blahblahbhalbahlkkdjf");         frame.getcontentpane().add(emptylabel, borderlayout.center);         //4. size frame.         frame.pack();          //5. show it.         frame.setvisible(true); } 

}

or set size with

frame.setsize(width,height); 

have fun!