Java default icons

I always had the doubt, how to use java's icons? or wich are the default java's icons. for example the Warning icon from JOptionPane, etc.

This could be usefull or I want this because some time I need to use icon fast and easy to test something or just to don't add my own icon.

And now after to search for everywhere and looking inside Java's code i found some of them.

To get defaults icon, you need to ask to javax.swing.UIManager class, wich one have the objects related with look&fell (borders, icons, fonts...)

for example:

Icon icon = UIManager.getIcon("OptionPane.informationIcon");
JButton buton = new JButton(icon);

And the icon list is the next :

Icon	Key
	"OptionPane.questionIcon"
	"OptionPane.errorIcon"
	"OptionPane.informationIcon"
	"OptionPane.warningIcon"
	"FileView.directoryIcon"
	"FileView.fileIcon"
	"FileView.computerIcon"
	"FileView.hardDriveIcon"
	"FileView.floppyDriveIcon"
	"FileChooser.newFolderIcon"
	"FileChooser.upFolderIcon"
	"FileChooser.homeFolderIcon"
	"FileChooser.detailsViewIcon"
	"FileChooser.listViewIcon"
	"Tree.expandedIcon"
	"Tree.collapsedIcon"
	"Tree.openIcon"
	"Tree.leafIcon"
	"Tree.closedIcon"