How to set jframe look and feel

Question

I am kind of confused on where to put this :

try {
    UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
    UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
} catch(Exception e){

}

I did not extend the JFrame class but used JFrame f = new JFrame(); Thanks :D

Answer 1

Most common place to put this, is right inside your static void main(String[] args) method. Like so:

public static void main(String[] args) {
    try { 
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); 
    } catch(Exception ignored){}

    new YourClass(); //start your application
}  

for more info look at this site: http://docs.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html

Answer 2

UIManager.setLookAndFeel() will not work on components that are already created. Here is a good way to set the Look And Feel for every window in your application. This will set it on all open Windows in your program. Any new windows created will use what was set by the UIManager.

    UIManager.setLookAndFeel(lookModel.getLookAndFeels().get(getLookAndFeel()));
    for(Window window : JFrame.getWindows()) {
        SwingUtilities.updateComponentTreeUI(window);
    }