swing - Java JFrame Background not working. Only working when I move the actual window -


i having problems setting image background. image show when move entire window. below fragment of code including setting background image.

playbutton = new jbutton(pbi); instructionbutton = new jbutton(ibi); quitbutton = new jbutton(qbi);  mainframe = new jframe("my major project"); mainframe.setdefaultcloseoperation(jframe.exit_on_close); mainframe.setsize(800, 600); mainframe.setlocationrelativeto(null); mainframe.setlayout(null);  mainframe.setlayout(new borderlayout()); mainframe.setcontentpane(new jlabel(new imageicon("background.gif"))); mainframe.setlayout(new flowlayout());  mainframe.setdefaultcloseoperation(jframe.exit_on_close);

in order update jframe, need call mainframe.repaint();.


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