var str = new NSString("Hello, World!");
// You can access this as a Java String if you wish too! (NSString#getJvmString)

var str = new NSURL("https://iridescentsoftware.net");
// You can access this as a Java URL if you wish too! (NSURL#getJvmURL)

var pasteboard = NSPasteboard.generalPasteboard();
pasteboard.clearContents();
pasteboard.setString("Hello, World!", NSPasteboard.TypeString);

var panel = NSOpenPanel.openPanel();
panel.setCanChooseFiles(true);

var result = panel.runModal();
if(result == NSAlert.NSModalResponse.OK) {
    NSURL url = panel.getURLs().objectAtIndex(0); // Can also use firstObject()
    System.out.println("First URL: " + url);
}