Windows look and feel instead, in InternalFrameDemo.java

Question

Hi all, I am learning swing and I am trying to modify the
InternalFrameDemo.java source from
http://docs.oracle.com/javase/tutorial/uiswing/examples/components/index.html#InternalFrameDemo
My idea is to add the line
JFrame.setDefaultLookAndFeelDecorated(true); in the constructor, but it doesn't work
and I don't understand why.
Could somebody please help me?
Kindest regards,
Lasse
public InternalFrameDemo() {
super("InternalFrameDemo");
//Make the big window be indented 50 pixels from each edge
//of the screen.
int inset = 50;
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
setBounds(inset, inset,
screenSize.width - inset*2,
screenSize.height - inset*2);
//FDoesn't work
JFrame.setDefaultLookAndFeelDecorated(true);
//Set up the GUI.
desktop = new JDesktopPane(); //a specialized layered pane
createFrame(); //create first "window"
setContentPane(desktop);
setJMenuBar(createMenuBar());
//Make dragging a little faster but perhaps uglier.
desktop.setDragMode(JDesktopPane.OUTLINE_DRAG_MODE);
}

Answer 1

Uh I think you're mistaken. Whenever in doubt or something doesn't work as expected, check the javadocs. The link to the javadocs can usually be found really easily by typing "java 6 classname". In this case:
http://docs.oracle.com/javase/6/docs/api/javax/swing/JFrame.html
If you want to set the Windows look & feel as your thread title suggests, this was not the method you were looking for as the javadocs will tell you. That method controls if a frame is decorated or not (as the name suggests), which it is by default. Setting it to true will not change anything.
So what then? You type into Google "java swing windows look and feel". Without quotes of course.