swing - Java setResizable issue -

package data;  import java.awt.eventqueue;  import javax.swing.jframe; import javax.swing.jpanel;  public class main extends jframe implements runnable {      private jpanel contentpane;     private jpanel pp = new jpanel();      thread page = new thread();      public void run() {         while (!thread.interrupted()) {          }     }      public main() {         setdefaultcloseoperation(jframe.exit_on_close);         setbounds(100, 100, 640 + 16, 480 + 39);         contentpane = new jpanel();         contentpane.setbounds(0, 0, 640, 480);         contentpane.setlayout(null);         setcontentpane(contentpane);          pp.setbounds(0, 0, 640, 480);         pp.setbackground(color.black);         contentpane.add(pp);     }      public static void main(string[] args) {         eventqueue.invokelater(new runnable() {             public void run() {                 try {                     main frame = new main();                     frame.setvisible(true);                     frame.setresizable(false);                 } catch (exception e) {                     e.printstacktrace();                 }             }         });     }  } 

the above code works setresizable causes issue: http://i.stack.imgur.com/hqxpu.png

if remove setresizable grey @ bottom , right black it's meant to. how can disable resizing without causing issue?

you're using absolute layout (no layoutmanager set), , black panel has fixed bounds. , that's reason black panel won't fill parent's bounds when parent resized.

solution: use layoutmanager automatically recalculates bounds of content fills available space.

   // borderlayout friend    contentpane.setlayout(new borderlayout());    ...    // delete line, no need set fixed bounds    // pp.setbounds(0, 0, 640, 480); 

more on how use layout managers in awt/swing:
the java™ tutorials - using layout managers

layout managers have 2 purposes:

• calculate min/max/preferred size of container
• layout components setting bounds within container.

if want black panel have size of 640x480, , window non-resizable, can set preferred size , pack window, causing size become appropriate content's preferred dimensions:

pp.setpreferredsize(new dimension(640, 480)); ... pack();