Java ImageIcon doesn't work -

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i have troubles when try display image in jpanel.

import java.awt.event.actionevent; import java.awt.event.actionlistener;  import javax.swing.imageicon; import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jlabel; import javax.swing.jpanel;  public class mainwindow {      public static jframe mainframe;     public static jpanel loginregisterpanel;       public mainwindow() {         mainframe();         loginregisterpanel();     }      public void mainframe() {          mainframe = new jframe();         mainframe.setsize(640, 480);         mainframe.setvisible(true);         mainframe.setdefaultcloseoperation(jframe.exit_on_close);         mainframe.setresizable(false);      }      public void loginregisterpanel() {          loginregisterpanel = new jpanel();         loginregisterpanel.setlayout(null);         mainframe.add(loginregisterpanel);          jbutton loginbutton = new jbutton("login");         jbutton registerbutton = new jbutton("register");          /*imageicon logoimage = new imageicon("resource/logo.jpg");         jlabel logoimagelabel = new jlabel();         logoimagelabel.setbounds(0, 0, 640, 200);         logoimagelabel.seticon(logoimage);         loginregisterpanel.add(logoimagelabel);         */           loginbutton.setbounds(260, 180, 120, 50);         loginregisterpanel.add(loginbutton);         loginbutton.addactionlistener(new actionlistener() {             public void actionperformed(actionevent e) {                 try {                     loginregisterpanel.setvisible(false);                     loginpanel loginpanel = new loginpanel();                     mainframe.getcontentpane().add(loginpanel.loginp);                 }                 catch (exception ce){                     ce.printstacktrace();                 }             }         });         registerbutton.setbounds(260, 250, 120, 50);         loginregisterpanel.add(registerbutton);      }      public static void main (string[] args) {         mainwindow mainwindow = new mainwindow();     } }

if delete section imageicon source code, jpanel displays buttons, if use imageicon, doesn't display anything.

loginregisterpanel.setlayout(null);
causing problem. guess absence of layout manager confuses java put all. should give gridlayout perhaps.


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