java - Successfully updating Look and Feel but still having errors -


i trying update , feel without errors, can't figure out doing wrong.

this window class:

public class window extends jframe {     private static final long serialversionuid = 1l;      public window() {         setdefaultcloseoperation(exit_on_close);         setlayout(new miglayout());         setextendedstate(jframe.maximized_both);         setminimumsize(new dimension(600, 700));         setvisible(true);          setcontentpane(new jpanel() {             private static final long serialversionuid = 1l;              public void paintcomponent(graphics g) {                 g.drawimage(new imageicon("start.jpg").getimage(), 0, 0, getwidth(),                          getheight(), this);             }         });     } }

and main update ui (look , feel)

public class main {     public static void main(string[] args) {         window.setdefaultlookandfeeldecorated(true);         try {             uimanager.setlookandfeel(new substancegraphitelookandfeel());         }         catch (unsupportedlookandfeelexception e) {}         window window = new window();     } }

the console says error comes line: window window = new window();

then line: setcontentpane(new jpanel() {

but if delete whole setcontentpane bloc, error points constructor.

any appreciated. thank you!

  1. substancegraphitelookandfeel() must wrapped invokelater()

  2. window window = new window(); shold wrapped invokelater(), more see in oracle tutorial initial thread

  3. g.drawimage(new imageicon("start.jpg").getimage(), 0, 0, getwidth(), getheight(), this);

    • use bufferedimage, load local variable

    • paintcomponent invoked every mouse, key events , internal methods implemented in apis, quite hard , long imageicon("start.jpg").getimage() called repeatly, how many times event fired repaint,

    • load local variable

  4. setcontentpane(new jpanel() {, override getmin/max/preferredsize


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